Westell I2 DS3 Network Interface Unit with Performance Monitoring

Transcription

1 Section Equipment Issue Rev. E, June 2008 Westell I2 DS3 Network Interface Unit with Performance Monitoring CLEI* Code: NCIPCG0CAA CONTENTS PAGE # 1. GENERAL APPLICATIONS CIRCUIT/FUNCTIONAL DESCRIPTION OPTIONS & FEATURES INSTALLATION CRAFT PORT SETUP AND OPERATION IR PORT SETUP AND OPERATION PROVISIONING LOOPBACK DS3 TEST PATTERN GENERATOR PERFORMANCE MONITORING TL1 COMMANDS TESTING & TROUBLESHOOTING CUSTOMER & TECHNICAL SERVICES WARRANTY & REPAIRS SPECIFICATIONS Figure 1. Isometric View of I2 NIU 1. GENERAL 1.1 Document Purpose This document describes the Westell I2 DS3 Network Interface Unit, shown in Figure 1. See Table 10 for information concerning other models in the same product family. Hereafter, the I2 DS3 Network Interface Unit will be referred to as the I2". 1.2 Document Status Revision E of this document updates the company contact information. Previous revisions updated the application drawings. Revision A replaced practice Product Purpose and Description The BroadTerm DS3 Network Interface Unit with Performance Monitoring, I2, serves as an interface between DS3 Network Facilities and customer premise equipment. The unit is shown in Figure 1. The I2 is a DS3-200 ME- CHANICS plug-in (1/2 width of 400 mechanics but with a 40-pin connector), allowing up to 24 units to be installed in a single rack-mounted shelf. The performance monitoring and remote testing capability of the I2 allow quick isolation of circuit problems at the point of demarcation. In addition, the unit s signal regeneration provides cost-effective extension of DS3 services. 1.4 Product Mounting The I2 is a DS3-200 MECHANICS NIU (1/2 width of 400 mechanics but with a 40-pin connector) and makes electrical connections to the Facility and sides of the circuit through a 40-pin card-edge connector of a DS3-200 MECHA- NICS type mounting. The I2 is typically mounted in a DBMA200 Series mounting shelf, at the customer premises on the network side of the demarcation point between the Network and. The mounting shelf for this DS3 PM-NIU is generally mounted after a multiplexer system. Westell offers a wide range of mountings available in both backboard (wall) and rack mount versions for DS3 NIUs. 1.5 Product Features The I2 offers the following features. DS3-200 MECHANICS NIU (1/2 width of 400 mechanics but with a 40-pin connector) DS3 interface per ANSI T Signal regeneration Loss of Signal (LOS) detection Copyright 2008 Westell, Inc. All rights reserved. *CLEI is a trademark of Telcordia Technologies. Westell is a trademark of Westell, Inc. Page 1 of 18

2 Section Rev. E NETWORK FIBER MUX DSX I2 NI RX TX 0 to 900 feet 0 to 900 feet Figure 2. Typical Application Using the BroadTerm PM-NIU NETWORK FIBER MUX DSX I I2 NI RX TX (Alt. LPBK Code #1) (Std. LPBK Code) 0 to 900 Feet 0 to 900 Feet 0 to 900 Feet Figure 3. Application Using Two BroadTerm PM-NIUs in a Tandem Configuration NETWORK FIBER MUX DSX I I I2 NI RX TX (Alt. LPBK Code #1) (Alt. LPBK Code #2) (Std. LPBK Code) 0 to 900 Feet 0 to 900 Feet 0 to 900 Feet 0 to 900 Feet Figure 4. Application Using Three BroadTerm PM-NIUs in a Tandem Configuration Loopback Time-out option of 20, 60, 120 minutes, 24 hours, or disabled Network (Single) or Network and (Dual) Loopback operation with remote, local or manual loopback activation/deactivation capability Network and -side Performance Monitoring (PM) capability with date and time stamped history Event and alarm log with date and time stamping Local Performance Monitoring retrieval capability via a front panel RS-232 Craft Port or via the front-panel Infra Red (IR) port using a handheld type device Remote Performance Monitoring retrieval capability via embedded overhead channel (NPRM) or TL1 Monitor access for both Network and side via front-panel DS3 WECO-440A-type monitoring jacks Automatic fail-safe operation; transmission paths remain transparent in the event of loss of power Built-in DS3 test pattern generator with pattern selection and far end loopback Integrated DS3 Level Detection TL1 command support Designed to meet the following regulatory, safety, or environmental specifications or requirements: Telcordia GR-499-CORE and ANSI T Meets/exceeds limits of radiated and conducted emissions defined in FCC Part 15 Class A equipment UL , 1st Edition 2. APPLICATIONS The I2 provides an interface between a DS3 Facility and the customer interface by terminating a DS3 (44.736Mb/s) High-Cap Digital Service derived over a 75-ohm coaxial cable pair. The I2 also monitors the performance of the DS3 service and isolates service problems. The I2 can also be 2

3 Rev. E Section used in range extension applications. The primary function of the unit is to provide a maintenance far end loopback along with Performance Monitoring. In addition, it contains a builtin pattern generator for testing purposes. These features aid in sectionalizing circuit problems. 2.1 Location and Mounting The I2 is installed at the customer premises on the network side of the demarcation point between the Network and. See Figure 2. The mounting assembly used to house the DS3 PM-NIU is generally mounted after a multiplexer system. Westell offers a variety of mountings for wall-mounted and relay rack applications. The I2 can be installed between the multiplexer and the with a range of 900 feet on each side of the unit (Figure 2). The unit regenerates the signal in both directions. For automatic fail-safe operation during cut-thru, a maximum loop length of 900 feet from the multiplexer cannot be exceeded. The NIUs can be installed in tandem to provide additional range extension (Figure 3 and Figure 4). In this configuration, the loopback code for the unit at the network end should be kept at the standard setting, being treated as a standard NIU. To avoid conflict, the additional unit(s) must be optioned for an alternate loopback code through the Craft Port. References to transmission ranges apply to 728- and 734-type coaxial cable. For applications using 735-type cable (higher loss), all distances should be halved. 3. CIRCUIT/FUNCTIONAL DESCRIPTION Refer to Figure 5, the I2 Functional/Block Diagram, as needed, while reading the following circuit description. 3.1 Side 1 and Side 2 Transmission Paths The I2 provides transformer coupling on all transmission ports. Both the Side 1 (NET to ) and Side 2 ( To NET) paths provide regeneration of the Network and signals. An optional output attenuator allows the signal level toward the to be reduced by approximately 6dB. 3.2 Monitoring Jacks Two front-panel accessible WECO 440A-type Jacks provide non-intrusive monitoring of the DS3 signals. The test set should be optioned for monitoring to insure proper levels are received. RCV FROM NET: Allows monitoring access to the DS3 signal toward the (ahead of the loopback point) XMT TO NET: Allows monitoring access of the DS3 signal toward the network 3.3 Framing Format and Line Code The BroadTerm PM-NIU interfaces DS3 signals using either M13 or C-Bit Parity framing formats. LEDs indicate the received framing format in each path. The unit accommodates AMI line coding using B3ZS format. The unit responds to specific code patterns to activate various features of the unit. Detection of these codes functions reliably with a bit-error rate of 10-3 or less on the facility. FROM NETWORK T NET SIGNAL DETECTOR NET LOS AIS (yellow=ais) (red=los) REGEN SIDE 1 ATTEN NET TO NET LPBK CT1 X TO AC1 AC2 +PWR -PWR CHASSIS GND POWER SUPPLY PWR ALM (green=pwr ) (red=alarm) CRAFT PORT (RS-232) MICROPROCESSOR CONTROL LOGIC InfraRed Craft PORT LPBK IR NET C-BIT M13 MAN LPBK T1 X CT TO NETWORK TO NET REGEN SIDE 2 (yellow=ais) (red=los) LOS AIS SIGNAL DETECTOR NET LPBK FROM Figure I2 Block Diagram - Transmission Paths During Normal Operation 3

4 Section Rev. E NET CBIT AIS NET CBIT NETWORK M13 LOS=RED NETWORK M13 LOS=RED LPBK AIS=YEL PWR/ STATUS AIS, IDLE, Code, or Pass Thru LPBK AIS=YEL PWR/ STATUS IR IR Figure 6. Network Loss Of Signal Figure 7. Loss Of Signal ID 3.4 Loss of Signal Detection DS3 signals from the Network are continuously monitored for LOS and control codes. If a loss of signal is detected, the frontpanel NET LOS LED illuminates red and an Alarm Indication Signal (AIS) is sent to the. See Figure 6. DS3 signals from the are continuously monitored for loss of signal. If a loss of signal is detected, the front-panel LOS LED lights. In addition, the unit can be configured to send a Loss Of Signal (CLOS) ID or pass the LOS onto the Network whenever the unit detects a loss of signal from the. 3.5 Loss Of Signal (CLOS) ID Upon detecting signal loss from the, the unit can send an AIS (continuous 1010), an idle signal (continuous 1100) or passthru toward the network (see Figure 7). The ID type is selected through the menu-based Craft Port. When the signal is restored, the ID signal stops being generated and the unit returns to normal operation. Definitions of AIS and IDLE signals are shown in Table 1. The CLOS ID feature can be remotely disabled for a 20-minute period by sending a loopdown Far-End Alarm and Control (FEAC) message to the unit. M Bits Normal F Bits Normal P Bits Normal C Bits 0 X Bits 1 Payload 1010" Pattern (AIS) Payload 1100" Pattern (IDLE) Table 1. AIS/IDLE Definitions 4. OPTIONS & FRONT PANEL FEATURES The I2 contains features and switch options located on the front and side (PCB) panels, as shown in Figure 8 and as described in the paragraphs that follow. Set any/all manual option switches prior to installing the unit. 4.1 Front Panel Features Monitoring Jacks The unit is equipped with two front panel DC-isolated 440Atype monitor jacks labeled XMT MON and RCV MON. RCV MON allows for monitoring signals in the Network-to- path. XMT MON allows for monitoring signals in the -to- Network path. Both jacks provide the proper termination resistance. These jacks are labeled to NET and NET to, as shown in Figure Front Panel Status LEDs NET and C-BIT: If these LEDs are illuminated, the unit is synchronized to the C-Bit framing format. NET and M13: If these LEDs are illuminated the unit is synchronized to M13 framing format. A more detailed explanation of the framing LEDs can be found in Section If LEDs are flashing green, the unit is receiving unframed data. NET LOS/AIS: Network signal status. When this LED is illuminated yellow, the unit is receiving AIS from the Network. When this LED is illuminated red, the unit is detecting a LOS from the Network. LOS/AIS: When this LED is lit yellow, the unit is receiving AIS from the Customer. When the LED illuminates red, the unit is detecting a LOS from the. When this LED is flashing red, the unit is generating a CLOS ID signal toward the network. 4

5 Rev. E Section Craft Interface Port (RS-232) I2 The front-panel RS-232 Craft Port allows local access to performance functions and locally provisioning the unit. See Section 6 for details IR Push-Button Switch The IR push-button switch on the front panel is used to activate the Infra-Red Craft Port. See Section 7 for details LPBK Push-Button Switch The I2 provides a front-panel Manual Loopback pushbutton switch that allows for manual activation/deactivation of the Loopback circuit. See Section 9 for details. 5. INSTALLATION Installation consists of inspecting the equipment for damage, following proper safety precautions, mounting the I2 in a Westell DBMA200-XX mounting, verifying the presence of power and signalling as indicated by the status LEDs (see Section 4.1). The following paragraphs provide detailed instructions for performing these procedures. - INSPECTION NOTE - If not previously inspected at the time of delivery, visually inspect the unit for damages prior to installation. If the equipment has been damaged in transit, immediately report the extent of the damage to the transportation company and to Westell (see Part 6 for telephone number). CAUTION - STATIC-SENSITIVE This product contains static-sensitive components! Proper electrostatic discharge procedures must be followed to maintain personal and equipment safety. Do not store units near magnetic, electromagnetic or electrostatic fields. Always store or ship units in the original static-protective packaging from Westell. Use anti-static mats when working on units. Figure 8. Option/Feature Locations PWR/STATUS: Indicates the power and alarm status of the unit. The LED illuminates green (ON) when power is applied to the unit or OFF if power is not applied. The LED illuminants red to indicate a fuse-alarm condition (i.e., on-board fuse is open). A fuse-alarm condition also activates a relay closure on the mounting assembly. LPBK: When this LED illuminates yellow, the unit is in Network Loopback. When LED is flashing yellow, the unit is in Dual Loopback mode. When the LED is flashing green, the unit is armed in the Inband Loopback mode. IR: When this LED illuminates green, the IR port is enabled. - PRECAUTIONARY STATEMENT - Never install telephone wiring during a lightning storm. Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations. Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface. Use caution when installing or modifying telephone lines. This equipment is intended to be used behind devices that provide primary lightning protection. This equipment is to be installed in a restricted access location. 5.1 Powering Considerations Each shelf is powered from a -22 to -56Vdc power source. The mounting also provides an alarm output for external reporting of a local power alarm condition. Connections are provided on each shelf for a back-up or redundant power source. The NIU 5

6 Section Rev. E and the mountings are designed for hot insertion and removal, meaning the shelf can be powered when inserting or removing circuit cards. Westell mountings also provide metallic cut-thru of the XMT and RCV transmission paths when the card is removed. 5.2 Mounting the Module The I2 is a DS3-200 MECHANICS NIU (1/2 width of 400 mechanics but with a 40-pin connector) plug-in module that mounts in a DBMA200-XX mounting assembly. The module is designed for use on the network side of the circuit. Before installing the module, set any option switch(es) to the desired position(s). Align the module with the mounting or assembly card guides above and below the unit and insert as far as it will go into the slot connector. - CAUTION - Use care when installing and removing modules - do not force a module into place. If a module resists insertion, remove it and check for obstructions in or near the module s or shelf s connectors and mounting slots. The module may then be carefully aligned and gently re-inserted. 5.3 Making Installer Connections The unit makes electrical connection when installed and properly seated in the 40-pin card-edge connector of the mounting assembly and connected to the DS3 connectors on the front panel. No installer connections are required for the IOR other than inserting the module into the card-edge connector in the shelf or assembly and making the DS3 connections. 6. CRAFT PORT SETUP AND OPERATION 6.1 Craft Port The Craft Port is a DB-9 connector with an electrical RS-232 female interface in a DCE configuration. The device used to interface the Craft Port can be a terminal operating in the VT-100 protocol or a PC running a VT-100 emulation program. If a VT-100-type terminal is used, a null-modem cable may be required between the terminal and the NIU. If a PC with a VT-100 emulation program is used, such as HyperTerminal or ProComm, a standard RS-232 cable can be used. The RS-232 port should be set up as follows: 9600 baud flow control set to None 8 data bits no parity one stop bit Select emulation as VT-100 Electrical connections to the RS-232 Craft Port are shown in Figure Figure 9. TxD (Transmit Data-OUT) RxD (Receive Data-IN) DTR (Data Terminal Ready) SGN (Signal Ground) Front-Panel RS-232 (DB9) ***** NIU DS3 MAIN MENU ***** ***** BroadTerm(tm) Model I2 ***** ***** MAIN OPTION MENU ***** (ESC).RETURNS TO MAIN OPTION MENU 1. CIRCUIT Information, Date, Time Menu 2. PROVISION Options 3. CIRCUIT Status 4. PATTERN Testing 5. CURRENT Performance Statistics 6. NETWORK Performance History 7. CUSTOMER Performance History 8. EVENT Log 9. ALARM Log 10. CLEAR Performance History Memory 11. DOWNLOAD PM Data/Event Log/Alarm Log 12. CONTACT Information Enter NUMBER for Menu Selection: Figure 10. Main Menu Screen 6.2 Password and Main Menu Screen Once connected, a Password menu screen may appear. The use of a password is optional and the Password screen only appears if a password is used. The default password=0000=none. The password can be changed through the Provisioning Menu screen and is case sensitive. There is also an emergency password that may be used if the user password is forgotten or mistyped. The emergency password is LOSTIT". This password is only usable if the unit is password protected. If no password has been used, the Password menu is never displayed. Upon entering the password, the Main Menu, shown in Figure 10, is displayed and the craftsperson can then select the appropriate item from the menu. 7. IR PORT SETUP AND OPERATION 7.1 IR Port Setup The IR port provides an alternate method of testing and provisioning the unit using a Palm OS handheld device, such as a Palm, Handspring or Sony Clie. Before using a hand-held device, the tester must install the Westell IR Terminal Palm OS application software. Software is available from Westell on CD (Compact Disc) or can be installed from the Westell Website ( or beamed from PDA to PDA. The Palm Resource (PRC) file name is IRTerminal.prc. Copy the IR Terminal.prc file onto the host PC in the directory along with the other Palm OS program files. Once copied, double click the IR- 6

7 Rev. E Section Install Tool X User: IR File(s) listed below will be installed on your handheld the next time you perform a HotSync operation: Add... File Name File Size IRTerminal.prc Tips: 8K Remove.. Done Find other applications to install on your handheld at The Add button looks first in the \ADD-OM folder inside your C:\PROGRAM FILES\PALM folder. This folder is a convenient place to store downloaded handheld files. Westell Inc. BroadTerm (tm) MODEL ISS. 2 MAIN OPTION MENU (A) CIRCUIT INFOR, DATE, TIME (B) PROVISIONING OPTIONS (C) CIRCUIT STATUS (D) PATTERN TESTING (E) CURRENT NETWORK PM DATA (F) CURRENT CUSTOMER PM DATA (G) PREVIOUS NETWORK PM DATA (H) PREVIOUS CUSTOMER PM DATA (I) EVENT LOG (J) ALARM LOG (K) CLEAR PM / EVENT / ALARM LOG (L) CONTACT INFORMATION ENTER NUMBER FOR MENU SELECTION Figure 11. IR Installation Screen *Palm, Palm OS and HotSync are registered trademarks of Palm, Inc. Figure 13. Main Menu Screen Terminal.prc file and the window shown in Figure 11 is displayed. Click the Done" button. Now, insert the handheld device into the Palm handheld cradle and press the HotSync button located on the Palm handheld or cradle and perform a HotSync function. Once completed, the Westell IR Terminal icon will appear on the Palm OS handheld device, as shown in Figure Craft Access Via the IR Port Module Front Panel IR Port 10 Degrees To access the I2 through the IR Port, press and release the front-panel IR push-button on the unit. The IR LED illuminates. Next, point the handheld device at the I2 (recommended operating range is 4 to 39 inches), then tap ESC. A password screen may appear. Enter the password (if used) from the Graffiti Pad. The Main Option Menu (see Figure 13) Figure 14. IR Port Angle appears on the hand-held screen. Next, tap the desired menu item. Alternatively, use the Graffiti handwriting recognition software built into the handheld to write the letter of the selected menu item. The IR Port times out after four minutes of inactivity. IR Terminal Icon The IR Port is installed at an angle of 10 from perpendicular, see Figure 14. This angle allows easier connection to the handheld device from higher locations. Use of a handheld device is limited by its screen size. For more in-depth capabilities, use a laptop with the front-panel RS-232 Craft Port. 8. PROVISIONING Figure 12. IR Terminal Icon Provisioning for the unit is accomplished locally via the menubased software provisioning or remotely via TL1 commands. The local menu system is accessed via the front-panel DB-9 Craft port connector or through a PDA and the front-panel IR transceiver. 7

8 Section Rev. E ***** CIRCUIT INFORMATION MENU ***** CLEI: NCIPCG0CAA LOOPBACK: Network or Dual MLB Button: Enable/Disable Current New Current Date: 11/05/2007 1) / / (MM/DD/YYYY) Current Time: 13:55 2) : (HH:MM) Military Time Circuit I.D.: 3) {UNIT 4 } Installation Date: 9/22/2007 4) / / (MM/DD/YYY) Notepad: 5) { } { } { } { } { } { } { } { } { } { } Enter NUMBER to change entry Figure 15. Circuit Information Screen 8.1 Circuit Information Screen The Circuit Information screen, shown in Figure 15, allows the craftsperson to enter and review date, time and general circuit details. Enter circuit information for correct time and date stamping. 8.2 Provisioning Menu Screen The Provisioning Menu screen, shown in Figure 16, allows the craftsperson to establish settings for the various options. Simply enter the letter of the setting to be provisioned. In addition, the settings may be saved as a custom default when required. The following options can be provisioned: CLOS ID: AIS, Idle, QRSS or Passthru Remote LPBK Time-out: Enable/Disable Manual LPBK Time-out: Enable/Disable Time-out Duration: 20m/60m/120m/24hr ***** PROVISION OPTIONS ***** Current New CLOS ID Selection Idle 1) Passthru 2) QRSS 3) AIS Remote Lpbk Time-out Enable 4) Disable Manual Lpbk Time-out Enable 5) Disable Time-out Duration 120 Min 6) 20 Min 7) 60 Min 8) 24 Hour Manual Loopback Type Network 9) Dual MLB Button Enable 10) Disable PM Threshold Setting ) 7.5x10-5 NPRM Mode Enable 12) Disable NET Frame Detect C-Bit 13) Auto 14) M13 Frame Detect C-Bit 15) Auto 16) M13 FEAC Loopback Code X 17) FF48H (STD) 18) FF20H ) FF68H Change Password 20) Inband Loopback Enable 21) Disable TX Level to Customer Normal 22) Low Factory Default Settings 23) PRESS *** Esc *** for MAIN MENU Enter NUMBER to change settings: Figure 16. Provision Options Menu Screen PM Threshold: 10-6, 7.5x10-5 NPRM Mode: Enable/Disable NET Frame Detect: Auto, C-Bit, M13 Frame Detect: Auto, C-Bit, M13 Inband Loopback: Enable/Disable TX Level to Customer: Normal/Low Return Factory Default Settings Default values for the options are identified in bold and italic type Loss Of Signal ID Selection (CLOS ID) The Customer LOS Identifier LED (CLOS ID), is set to respond to a loss-of-signal condition from the side of the unit. The unit can be provisioned to send AIS, QRSS or IDLE code, or can be provisioned for the pass-through mode where the LOS condition is passed on toward the Network Remote Loopback Time-out Remote Loopback Time-out can be set to either enable or disable the timeout feature for remotely activated loopback Manual Loopback Time-out Manual Loopback Time-out can be set to either enable or disable the 20/60/120-minute and 24-hour feature for manually activated loopback Time-out Duration Time-out Duration allows the craftsperson to select the duration of the loopback timeout if enabled. The choices are 20/60/120-minute and 24-hour Manual Loopback Type Manual Loopback Type allows the craftsperson to choose either Network or Dual loopback to be controlled from the front panel pushbutton MLB Button Manual Loopback control from the front-panel LPBK push button can be enabled or disabled through the Provisioning menu. Refer to Section 10 for additional manual loopback details PM Threshold Settings A threshold setting of either 10-6 or 7.5x 10-5 defines the point at which Severely Errored Seconds (SES) are declared. 8

9 Rev. E Section NPRM Mode Insertion of Network Performance Report Messages (NPRMs) by the unit into the DS3 overhead for remote PM retrieval can be enabled or disabled Framing Detection Option (C-Bit or M13) The unit can be configured to monitor specific framing patterns (C-Bit or M13) and provide a flashing LED indication if a mismatch or Loss Of Frame (LOF) condition occurs. Alternately, framing detection can be set for Auto mode in which both framing types are monitored and indicated via front-panel LEDs. This option can be set for Network and framing independently. When AUTO mode is selected via the Provisioning screen: If C-Bit framing is received, CBIT LED is ON, M13 LED is OFF. If M13 framing is received, M13 LED is ON, CBIT LED is OFF. If no framing is received, both the M13 and the CBIT LEDs flash. When C-Bit mode is selected via the Provisioning screen: If C-Bit framing is received, CBIT LED is ON, M13 LED is OFF. If M13 framing is received, M13 LED flashes and CBIT LED is OFF, indicating a framing mismatch. If no framing is received, both the M13 and the CBIT LEDs flash. When M13 mode is selected via the Provisioning screen: If M13 framing is received, the M13 LED is ON, the CBIT LED is OFF. If C-Bit framing is received, CBIT LED flashes and M13 LED is OFF, indicating a framing mismatch. If no framing is received, both the M13 and the CBIT LEDs flash FEAC Loopback Codes One of three FEAC codes can be selected to remotely activate the Loopback function. See Section 9 for additional details Inband Loopback Inband Loopback allows the craftsperson to enable or disable the inband detection of loopback codes Factory Defaults This option resets all provisioning values to the original factory settings Remote Provisioning Most options may be remotely set via TL1 commands. Refer to Section LOOPBACK Loopback is used during maintenance and circuit troubleshooting to verify the integrity of the DS3 facility. Testing can be performed with a standard DS3 test set or test head conforming to ANSI interface specifications. Two types of loopback conditions are supported on this unit; Network and Dual. Network loopback takes the signal from the network and loops it through the unit back towards the network (See Figure 17). The unit loops back the signal at the metallic interface to ensure that all components of the NIU are included in the path. In this loopback mode, the signal is terminated. Dual loopback takes the signal from the network and loops it back (logic loopback) towards the network. At the same time, signal received from the port is looped back towards the (Refer to Figure 18). 9.1 Loopback Activation/Deactivation Loopback activation/deactivation can be accomplished in one of two ways: 1. Remotely via control codes from a test location 2. Locally via the front-panel LPBK (Manual Loopback) push-button switch or menu-based Craft Port. The Provisioning menu also allows the front-panel LPBK switch to be disabled. NETWORK LPBK NET CBIT M13 LOS=RED AIS=YEL PWR/ STATUS X X TX Level to Customer The transmit level to the customer allows the craftsperson to set the level to the customer to either a normal or a low level. The low setting attenuates the signal by approximately 6dB. Figure 17. Network Loopback IR 9

10 Section Rev. E NETWORK LPBK LED flashes during Dual Loopback LPBK NET CBIT M13 LOS=RED AIS=YEL PWR/ STATUS IR Figure 18. Dual Loopback FF48H (Standard) FF20H (Alt #1) FF68H (Alt #2) Table 3. User Programmable FEAC Loopback Activation Codes 9.4 Remote Loopback Operation - In-Band In-band Loopback is supported in both C-Bit and M13 framing modes. The In-Band Loopback procedure is a two step process. The unit is armed by sending a 7-bit pattern ( ) within the DS-3 payload blocks for at least five seconds. When the arming signal is received for five seconds, the NIU begins a 20 second timeout period. During this timeout period, if the NIU detects a 16-bit loopback signal ( ), the unit switches to the loopback state. If the loopback signal is not detected within a 20-second period, the NIU returns to normal (unarmed) operation. To deactivate loopback, a 7-bit deactivation code ( ) is sent to the NIU. In network loopback, the LPBK LED illuminates and the signal is terminated. In the dual loopback mode, the LPBK LED flashes. 9.2 Remote Loopback Operation - FEAC Codes When using C-Bit parity framing, the Network Service Provider can use the FEAC codes to send loop-up and loop-down codes to the unit. FEAC codes are sent through an embedded communication channel within the C-Bit framing. The unit responds to 10 consecutive repetitions of the FEAC code to activate or deactivate network loopback (see Table 2). After removing the Loopback Activate Code for a minimum of 5 seconds, the code can be reapplied to remotely activate a dual loopback condition. Loopback Activate Loopback Deactivate Table sent >10 repetitions sent >10 repetitions Standard Loopback FEAC Codes When loopback is activated, a 20, 60 or 120-minute or the 24-hour Loopback Time-out feature is also activated, if enabled. Loopback automatically times out and the unit returns to normal operation after the selected time frame, unless the unit receives a loop-down code or if loopback is manually removed. 9.3 Programmable Loopback FEAC Codes The FEAC code used for loopback activation can be user-programmed via the Craft Port. The allowable codes are shown in Table 3. Provisioning for an alternate loopback activation code is useful when units are used in tandem on a circuit, allowing each unit to be looped back individually. See the Provision Options Menu screen, Figure Manual Loopback Activation Manual Loopback activation is accomplished by pressing and releasing the front-panel LPBK push-button switch. It can also be activated via the Craft Port. When the LPBK switch is pressed and released, the LPBK LED illuminates, indicating loopback activation. Manual loopback type (Network or Dual) is selected via the Craft Port and the Provisioning Menu. The Provisioning Menu also allows the front-panel LPBK switch to be disabled Manual Loopback Deactivation In the Network or Dual Loopback mode, press and release the front-panel LPBK switch a second time to loopdown the unit. Manual loopback can also be deactivated via the Craft Port or by sending the Loopback Deactivation code from the Network side. 9.5 Loopback Time-out The unit features a timeout option that can be set to automatically release the unit from loopback after 20, 60 or 120 minutes or 24 hours. After the selected time out period expires, the unit returns to normal operation. The Loopback Time-out feature can be either enabled or disabled for both remote and manual loopback independently via local provisioning. The Loopback Time-out feature can also be temporarily disabled remotely by sending the code (FF40h). The Loopback Time-out feature returns to its previous setting upon loopback deactivation. 10. DS3 TEST PATTERN GENERATOR 10.1 Pattern Testing Screen The Pattern Testing screen, shown in Figure 19, allows stress patterns to be sent by the NIU toward either the network or the. In addition, the NIU monitors return signals and displays the measured bit error rate on the screen. This screen is accessible from the Main screen by selecting 4", Pattern Testing. Exiting the pattern test screen will abort the test. 10

11 Rev. E Section dBdsx < NET > ***** PATTERN TESTING ***** 1. Send Pattern to Network 2. Deactivate Pattern to Network NIU3 3. Send Pattern to Customer > 4. Deactivate Pattern to Customer 5. Framing for Pattern C-BIT 6. Timing Source for Pattern NTWK < 7. Insert Bit Error 8. Reset Pattern Error Counters 9. Pattern Selection: 2^23-1 Pattern Errors Sync Network NO Customer NO Selection: Figure 19. Pattern Testing Screen To send a pattern to the network, select 1" from the Pattern Testing screen using the Craft Port or A" on the IR Port screen. Verify receipt of the test pattern using a test set or the built-in error counter. To deactivate the pattern, select 2" or B". To insert a bit error into the pattern, select 7" from the Pattern Test screen or G" from the IR Port. To reset the pattern counters, select 8" from the Pattern Test screen or H" from the IR Port. In order to select a different pattern for testing, select 9" from the Pattern Test screen or I" from the IR Port. This displays the DS3 Pattern Selecting Screen, shown in Figure 22. ***** DS3 PATTERN SELECTING SCREEN ***** ***** Model I2 ***** 1. 2^ QRSS 3. BLUE 4. IDLE 5. USER 6. ARM ( ) 7. Loopback ( ) 8. DISARM ( ) PRESS *** Esc *** to return to previous screen Enter Selection: Figure 22. DS3 Pattern Selecting Screen To send a pattern to the, select 3" from the Pattern Test screen or C" from the IR Port screen. Verify receipt of the test pattern using a test set or the built-in error counter. To deactivate the pattern, select 4" or D". To change the framing for the pattern, select 5" (or E" from the IR Port). The available choices are C-BIT", Unframed" and M13", as shown in Figure 20. ***** DS3 PATTERN SELECTING SCREEN ***** ***** Model I2 ***** 1. CBIT 2. M13 3. UNFRAME PRESS *** Esc *** to return to previous screen Enter Selection: Figure 20. DS3 Pattern Framing Screen To select a timing source for the pattern, select 6" (or F" from the IR Port). The available choices are NTWK" and LO- CAL", as shown in Figure 21. ***** DS3 TIMER SELECTING SCREEN ***** ***** Model I2 ***** 10.2 Using Pattern Testing to Loopback Far End Unit The following procedure is employed when the pattern generator is used to loopback a far end unit. Refer to Figure 23 and Table From the Main Menu, select 4", Pattern Testing. 2. From the Pattern Testing Menu, select 9", Pattern Selection. 3. In the Pattern Selection Menu, select 6", ARM ( ). Once the ARM pattern is selected, the screen will return to the Pattern Testing Menu. 4. To ARM the remote unit on the Network Side, select 1", Send Pattern to Network. To ARM the remote unit on the Customer Side, select 3", Send Pattern to Customer. 5. The Pattern Testing menu will now show ARM being transmitted in the direction chosen in Step 4. Allow pattern to be sent for approximately five seconds before moving on to the next step. 1. LOCAL 2. NETWORK PRESS *** Esc *** to return to previous screen Enter Selection: Figure 21. DS3 Timer Selecting Screen The LOCAL" setting is only used for testing purposes. Make sure that the timing source is set to NETWORK" for normal operation. Inband Test Codes Description (2E23h) 2^ (D742h) Idle (D741h) Blue (2E20h) QRSS (D743h) User Defined Table 4. Remote Pattern Generator 6. Select 9", Pattern Selection, then select 7" in the Pattern Selection Menu, LPBK ( ). 11

12 Section Rev. E A Loopback Controls and Test Patterns I I2 Figure 23. Far End Loopback using Internal DS3 Pattern Test Generator Z Once the LPBK pattern is selected, the screen will return to the Pattern Testing Menu. The Pattern Testing Menu will now show LPBK being transmitted in the direction selected. After a few seconds, the SYNC indicator will show YES". This means the remote unit has looped back. 7. Select 9", Pattern Selection, then select either 1", 2^23-1 or 2", QRSS, in the Pattern Selection Menu. With the far end unit now looped back, round trip pattern testing can be performed. Once the pattern is selected, the screen will return to the Pattern Testing Menu, and show the selected pattern being sent toward the looped back far end unit. The SYNC indicator should be showing YES", and the error counter is tracking biterrors. The error counter is reset by selecting 8", Reset Pattern Error Counters Loopdown Procedure The following procedure is used to remove loopback from the far end unit. 1. To loopdown the far end unit, select 9", Pattern Selection Menu. In the Pattern Selection Menu, select 8", DIS- ARM ( ). Once DISARM is selected, the screen will return to the Pattern Testing Menu, and show DARM being sent to the remote unit. The SYNC indicator will change to NO", signifying that the far end unit has looped down. 2. To turn off the pattern generator on the Network Side, select 2", Deactivate Pattern to the Network. To turn off the pattern generator on the Customer Side, select 4", Deactivate Pattern to the Customer. 3. Press ESC to return to the Main Menu. 4. To turn off the pattern generator on the Network Side, select 2", Deactivate Pattern to the Network. To turn off the pattern generator on the Customer Side, select 4", Deactivate Pattern to the Customer. 5. Press ESC to return to the Main Menu. 11. PERFORMANCE MONITORING The I2 continuously monitors and records the performance of DS3 service in the transmit and receive directions. Circuit status and performance history are retrievable from the Craft Interface of the NIU. Performance history is also reported remotely via ANSI-standard messages in the overhead channel. In addition, performance data can be accessed through TL1 commands. Refer to Section 12 for details Circuit Status The I2 provides a Circuit Status screen that summarizes current transmission conditions, see Figure 24. The Circuit Status screen includes a measurement of the DS3 signal strength being received from the Network and sides. ***** CIRCUIT STATUS ***** BroadTerm (tm) I2 DS3 NIU RCV from Network dbdsx > Framing: C Bit Parity RCV Alarm: None < XMT to Network Loopback Timeout: Circuit I.D.: UNIT 4 Installation Date: 11/22/2007 XMT to PRESS L to toggle Loopback > Framing: C Bit Parity RCV Alarm: None < 00.0 dbdsx RCV from Figure 24. Typical Circuit Status During Normal Operation 11.2 Performance Primitives Performance primitives are events that provide the foundations to store performance of the DS3 service. Primitives are single events that may be grouped to provide the building block for creating performance parameters. The categories under the performance primitives are shown in Table 5. 12

13 Rev. E Section Line Anomalies Bipolar Violations Excessive Zeros Line Defects and Failures Loss of Signal Path Anomalies C-Bit Parity Error Path Defects and Failures Out of Frame Severely Errored Frame Alarm Indication Signal Remote Alarm Indication Table 5. BPVs EXZs LOS CBPR OOF SEF AIS RAI Performance Primitives 11.3 Performance Parameters Performance parameters are comprised of single or grouped performance primitives. Performance parameters are stored in non-volatile memory for retrieval. The categories for performance parameters are shown in Table 6. Line Parameters Errored Seconds Severely Errored Seconds Unavailable Seconds Code Violation Loss of Signal Seconds Path Parameters Errored Seconds Severely Errored Seconds Unavailable Seconds Code Violation, P-bit Code Violation, CP-bit Errored Second, P-bit Errored Second, CP-bit Severely Errored Second, CP-bit Far End Parameters Code Violation, CP-bit Errored Second, CP-bit Severely Errored Second, P-bit Unavailable Second, CP-bit Other Parameters Severely Errored Frame Seconds Far End Bit Errors Severely Errored Frame/Alarm Indication Signal (SEF/AIS) Second Alarm Indication Signal Seconds Table 6. Performance Parameters 11.4 Performance Storage Registers ES SES UAS CV LOSS ES SES UAS CVP CVCP ESP ESCP SESCP CVCP ESCP SESP UASCP SEFS FEBE SAS AISS Performance Storage Registers provide historical information pertaining to the Network and Customer DS3 service. The I2 records this information in 15-minute, 1 hour, daily and monthly intervals up to three months (see Table 7) and stores this information in memory for later retrieval. Access to this information is accomplished via the Craft Port or IR port. Example screens are shown in Figure 25 to Figure 31. Classification Status Previous 15 Minutes Current 100 Intervals 1 Hour Current 60 Intervals 1 Day Current 31 Intervals 1 Month Current 3 Intervals Table 7. Performance Storage Information ***** CURRENT PERFORMANCE STATISTICS ***** Current Performance Menu 1. Current Summary Performance Statistics 2. Current Expanded Performance Statistics 3. Current Path Far End (PFE) Performance Statistics Enter NUMBER for Menu Selection Press *** Esc *** to return to MAIN MENU Figure 25. Network Performance History Menu ***** CURRENT SUMMARY PERFORMANCE STATISTICS ***** Date: 02/05/2007 Time: 23:56 LINE PATH DATE TIME ES SES UAS ES SES UAS SEFS FEBE MSEC 02/05/ :15 Current 15 Minute Interval 511 Network Customer /05/ :14 Current 1 Hour Interval 0559 Network Customer /05/ :14 Current 1 Day Interval Network Customer /05/ :14 Current 30 Day Interval Network Customer PRESS *** Esc *** to return to CURRENT P.M. MENU Figure 26. Current Summary Performance Statistics Screen ***** CURRENT EXPANDED PERFORMANCE STATISTICS ***** Date: 02/05/2007 Time: 23:56 LINE PATH DATE TIME CV LOSS CVP CVCP ESP ESCP SESCP SAS AISS 02/05/ :15 Current 15 Minute Interval Network Customer /05/ :14 Current 1 Hour Interval Network Customer /05/ :14 Current 1 Day Interval Network Customer /05/ :14 Current 30 Day Interval Network Customer PRESS *** Esc *** to return to CURRENT P.M. MENU Figure 27. Current Expanded Performance Statistics Screen 13

14 Section Rev. E CURRENT PATH FAR END (PFE) PERFORMANCE STATISTICS Date: 02/05/2007 Time: 23:56 PATH FAR END DATE TIME CVCP ESCP SESCP UASCP 02/05/ :15 Current 15 Minute Interval Network Customer /05/ :14 Current 1 Hour Interval Network Customer /05/ :14 Current 1 Day Interval Network Customer /05/ :14 Current 30 Day Interval Network Customer PRESS *** Esc *** to return to CURRENT P.M. MENU Figure 28. Current Path Far End Performance Statistics Screen ***** NETWORK PERFORMANCE STATISTICS ***** Summary Performance History 1. Previous 100, 15 Minute Intervals 2. Previous 60, 1 Hour Intervals 3. Previous 31, 1 Day Intervals 4. Previous 3, 30 Day Intervals Expanded Performance History 5. Previous 100, 15 Minute Intervals 6. Previous 60, 1 Hour Intervals 7. Previous 31, 1 Day Intervals 8. Previous 3, 30 Day Intervals Summary Performance History 9. Previous 100, 15 Minute Intervals 10. Previous 60, 1 Hour Intervals 11. Previous 31, 1 Day Intervals 12. Previous 3, 30 Day Intervals Enter NUMBER for Menu Selection Figure 29. Network Performance History Menu ***** NETWORK SUMMARY PERFORMANCE HISTORY ***** Date: 02/05/2007 Time: 18:28 Previous 100, 15 Minute Intervals LINE PATH DATE TIME ES SES UAS ES SES UAS SEFS FEBE 02/05/ : /05/ : /05/ : Page 1 of 9 PRESS P for previous screen PRESS N for next screen PRESS *** Esc *** to return to HISTORY MENU Figure 30. Typical Network Summary Performance History Screen ***** CLEAR PERFORMANCE HISTORY MEMORY ***** 1. Clear Performance Memory 2. Clear Event/Alarm Log 3. Clear All ***** Enter NUMBER for Menu Selection ***** Figure 31. Clear Performance History Menu 11.5 Remote NPRM Retrieval The NIU may be provisioned to send Network Performance Report Messages (NPRM) for retrieval through remote test or monitoring systems. Messages are sent for the following intervals through the DS3 overhead channel as specified in ANSI T Current 15 minutes Previous 15 minutes Current 24 hours Previous 24 hours 11.6 Event and Alarm Log Screens The Event and Alarm Log screens, shown in Figure 32 to Figure 35, provides the craftsperson with detailed logs for the unit. It also allows the craftsperson to clear the log and continue logging new events. The Event Log has a capacity of 8 pages with 25 events per page, for a total of 200 events displayed. The Alarm log has a capacity of 8 pages with 25 alarms per page, for a total of 200 alarms displayed. The alarms that are logged are shown in the following list: Network Loss Loss NET Signal Restored Signal Restored Rcvd AIS from NET Rcvd AIS from Rcvd RAI from NET Rcvd RAI from NET Indicator Cleared Indicator Cleared Rcvd Idle from NET Rcvd Idle from NET LOF Detected LOF Detected NET LOF Cleared LOF Cleared The events that are logged are shown in the following list: Remote NET Loopback Local NET Loopback Remote Loopdown Local Loopdown Loss of Power Power Restored PMON Register Reset Event/Alarm Log Reset Date/Time Changed From Circuit Info. Change Provision Changed Loss Override Remote Dual Loopback Local Dual Loopback Date/Time Changed To Password Changed 14

15 Rev. E Section ***** EVENT LOG ***** 13. TESTING & TROUBLESHOOTING Date: 12/05/2007 Time: 14:13 DATE TIME EVENT DATE TIME EVENT 11/05/ :35 POWER RESTORED 11/05/ :35 LOSS OF POWER 11/05/ :45 POWER RESTORED 11/05/ :45 LOSS OF POWER 11/05/ :01 PMON REGISTER RESET 11/05/ :01 EVENT/ALARM LOG RESET PRESS P for previous screen PRESS N for next screen Figure 32. Typical Event Log Screen ***** ALARM LOG ***** Date: 12/05/2007 Time: 14:13 DATE TIME EVENT DATE TIME EVENT 12/05/ :52 LOS Page 1 of 8 PRESS P for previous screen PRESS N for next screen Figure 33. Typical Alarm Log Screen ***** DOWNLOAD PM DATA / EVENT LOG / ALARM LOG ***** 1. Download Performance Data History 2. Download Event Log 3. Download Alarm Log Enter NUMBER for Menu Selection Figure 34. Download PM Data/Event/Alarm Log Menu 13.1 Testing Initial testing consists of performing basic test procedures using the unit s internal pattern generator or standard DS3 test equipment (T-Berd, Sunrise, REACT or equivalent) to verify the unit s basic functions, such as loopback and signal regeneration, and verify that the LEDs are operating properly. This equipment should not be field repaired. If the equipment is suspected of being faulty, replace it with another unit, optioned identically, and retest. If the replacement unit appears to operate correctly, the original unit may be faulty and should be returned to Westell for repair or replacement (Paragraph 15.2). Westell contact information (Figure 36) can be accessed by selecting 12" from the Craft Port Main Menu. ***** CONTACT INFORMATION ***** Westell Inc. For Technical Support Call: (800) global_support@westell.com Internet: Westell Model I2 DS3 NIU CLEI: NCIPCG0CAA Software Release: Figure 36. Contact Information Menu ***** DOWNLOAD PM DATA / EVENT LOG / ALARM LOG ***** Instructions for downloading: Using Hyperterminal: 1) Click on the Transfer menu. 2) Click on Receive File... 3) Select folder to place the file in. 4) Select Xmodem as the protocol, and Click Receive. 5) Enter a filename for the received file. (filename.txt) 6) Click OK to start download. Using ProComm: 1) Press <Page Down> key. 2) Select Item 1) XMODEM. 3) Enter Path and Filename to save to. (C:\path\filename.TXT) 4) Press <ENTER> to start download. Note: Error Checking = Checksum Figure 35. Download PM Data/Event/Alarm Instruction Screen 12. TL1 COMMANDS The I2 allows maintenance personnel to use TL1 commands for remote provisioning, data manipulation and retrieval of the event log. A list of TL1 commands that the unit recognizes are shown in Table 8 and Table Troubleshooting If trouble is encountered, verify all installer connections to the assembly and check that the CO power fuse is not blown. Also verify all module connections and option switch settings, and verify the modules are making a positive connection with the shelf connector. If trouble persists, replace the suspect unit and repeat procedures outlined. These procedures are not designed to effect repairs or modifications. Any tests beyond those outlined herein, or repairs made beyond replacing a faulty unit, are not recommended and may void the warranty. 14. CUSTOMER & TECHNICAL SERVICES 14.1 Customer Service & Technical Assistance If technical or customer assistance is required, contact Westell by calling or using one of the following options: Voice: (800) global_support@westell.com For additional information about Westell, visit the Westell World Wide Web site at 15