Generic Circuit Switched Network
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1 Generic Circuit Switched Network C D B 4 6 E 5 7 F Permanently Dedicated Dedicated During Entire Session Node User SCTE V 9.1
2 Switching Technology Progressive Control System Controller (Control Processor) Common Control SCTE V 9.2
3 Circuit Switched Network Packet Switched Network C C D D B 4 6 E B 4 6 E 5 7 F 5 7 F Dedicated During Entire Session Permanently Dedicated PD User Node SCTE V 9.3
4 Packet Format Header Information MXIMUM Length SCTE V 9.4
5 Exercise Break into groups of 9 individuals. Pick a person to be Network manager. This person will report how the exercise proceeded, and distribute the index cards You will be given 6 index cards for switches, and one for destination. You will also be given a small envelope labeled source. Network Manager: Give these to 8 people, who are to act as a switch with a particular number and source and destination. Source has an envelope with an original message, cut into packets. Each packet has a route through the network. Source starts the distribution, fter that, the switches route to the next location. Destination must reassemble the message. Each ring of the bell is one clock cycle. The source releases one message, in alphabetical order, per clock cycle. Switches can route only one message to the next switch per clock cycle. You must keep all the others until the next cycle. Route the lowest alphabetical message first. ( before B, etc.) Keep track of how information flows through your network of switches. Note any problems/challenges. You have 10 Minutes! SCTE V 9.5 8
6 Network Manager s History Table Location of Packets by Source, Switch, or Destination Clock Cycle Source Destination 0 1 B 2 C 3 D 4 E 5 F 6 G 7 H 8 I SCTE V 9.6
7 Types of Protocol Data Unit Being Sent Through a Packet Switched Network Packet Format Header Information Message Format F l a g Layer 2 Info Layer 3-5 Info Layer 2 Info F l a g SCTE V 9.7
8 Packet Switched Network Routing ROUTING WHT S INCLUDED CONSIDERTION Performance Number of hops Cost Delay Throughput Decision Time Packet (Datagram) Session (Virtual Circuit) Decision Place Each node (Distributed) Central node (Centralized) Originating node Source of Information on Network Status None Local djacent Nodes Nodes along route ll nodes Routing Strategy Fixed Flooding Random daptive daptive Routing Update Time Continuous Periodic Major load change Topology change SCTE V 9.8
9 Network rchitecture Examples PPLICTION TYPE OF INDUSTRY SWITCHING Public Switched Circuit Telephony Telephone Network (PSTN) Common Channel Packet Telephony Signaling Wide rea and Packet Data Metropolitan rea Networks Multi-Service Network Hybrid Cable Telecommunications SCTE V 9.9
10 PSTN To Interexchange Carrier (Long Distance) Network T T TD EO EO: End Office - Connection to End User TD: Tandem Office T: ccess Tandem SCTE V 9.10
11 CCS Network Links CCS Network Dotted line is being used to designate a Central Office SCP SCP STP STP C B B B B STP STP C SCP SCP D To nother CCS Network STP E STP Co-located Switch and STP/SCP Public Switched Telephone Network SCTE V 9.11
12 CCS Links Link Designation Link Function -Link ccess Link - Switch or Database access to STP B-Link Bridge Link - Interconnection of STP pairs in different regions (redundancy for reliability) C-Link Cross Link - Interconnection of pairs of STPs in the same region D-Link Network Interconnect - Interconnects STPs of different carriers E-Link Extended Link - Connects switch to STP in another region F-Link Facilities Link - Name for the CCS link between switches when the packet switch functionality is built into the telecommunications switch itself, and no STP is involved in the message routing SCTE V 9.12
13 WNs and MNs X.25 Network Ethernet LN X.25 PD x.75 Interconnect X.25 PD x.25 Network Token Ring SCTE V 9.13
14 SCTE V 9.14 DigiPoints Head-End HDT Service Node ccess Node Distribution. Coax Coax Coax Coax Fiber Node Service Node DM DM DM D/ RF Combiner MPEG-2 Encoder TR-303 Linear Lightwave Receiver Linear Lightwave Transmitter DM Digital Video Server Broadband Switch Video Server Narrowband Switch Narrowband Switch Multi-Service Network
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