BIT RATE CALCULATION WITH BARIX DEVICES
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1 BIT RATE CALCULATION WITH BARIX DEVICES With this document we want to explain how to calculate the total bit rate flowing on an Ethernet cable connected to a Barix device. The total bit rate is equal at the audio bit rate plus the overhead due to the encapsulation of audio packet inside the layers of OSI stack ( Application Application Presentation Session TCP/IP Transport Netw ork Ethernet Link Physical We have used for the test an Instreamer 100 (with standard firmware) configured first in RAW UDP and then in RTP, and an Exstreamer 1000 (with STL firmware). bit_rate_calculation_3_0.odt 1
2 RAW UDP STREAMING MODE Ethernet Packet ( Preamble* 56 Start-of-Frame-Delimiter* 8 MAC destination 48 MAC source 48 Ethertype/Length 16 CRC32* 32 Interframe gap* 92 Data (IP Packet) Total (without data) 300 * As the Ethernet hardware filters the Preamble (plus Start-of-Frame-Delimiter) and Interframe gap, it is not given to Wireshark or any other application. Most Ethernet interfaces also either don't supply the CRC32 to Wireshark or other applications, or aren't configured by their driver to do so ( IP Packet ( Version 4 Header length 4 Type of Service (now DiffServ and ECN) 8 Total Length 16 Identification 16 Flags 3 Fragment Offset 13 Time to Live 8 Protocol 8 Header Checksum 16 Source Address 32 Destination Address 32 Data (UDP Packet) Total (without data) 160 bit_rate_calculation_3_0.odt 2
3 UDP Packet ( Source Port 16 Destination Port 16 Length 16 Checksum 16 Data (Audio Packet) Total (without data) 64 Total Bits of per Packet Packet Ethernet 300 IP 160 UDP 64 Total 524 The Audio Bit rate is expressed in bit/ but the is expressed in bit/packet. So we have to translate the (bit/packet) in rate (bit/). For this we need to know the amount of packet/, that depends by and is measurable with Network Protocol Analyzer software like Wireshark. The values of for audio format, sampling frequency and quality (MP3 bitrate average), come from Instreamer Manual (firmware V3.0 page Mono input with MS-Stereo encoding disabled bit_rate_calculation_3_0.odt 3
4 Stereo inputs = Packet x Total Bit = + (1 Kbit = 1000 bit) PCM 16 bit 8 Khz, mono PCM 16 bit 24 Khz, mono (bit) Total Bit ulaw 8 Khz, mono ALaw 8 Khz, mono ALaw 24KHz, mono ulaw 24 Khz, mono quality 0, stereo quality 4, stereo quality 7, stereo bit_rate_calculation_3_0.odt 4
5 (bit) Total Bit Total Bits of per Packet (without Ethernet ) Packet IP 160 UDP 64 Total 224 bit_rate_calculation_3_0.odt 5
6 PCM 16 bit 8 Khz, mono PCM 16 bit 24 Khz, mono without Ethernet (bit) Total Bit without Ethernet ulaw 8 Khz, mono ALaw 8 Khz, mono ALaw 24KHz, mono ulaw 24 Khz, mono quality 0, stereo quality 4, stereo quality 7, stereo bit_rate_calculation_3_0.odt 6
7 RTP STREAMING MODE Ethernet Packet ( Preamble* 56 Start-of-Frame-Delimiter* 8 MAC destination 48 MAC source 48 Ethertype/Length 16 CRC32* 32 Interframe gap** 92 Data (IP Packet) Total (without data) 300 IP Packet ( Version 4 Header length 4 Type of Service (now DiffServ and ECN) 8 Total Length 16 Identification 16 Flags 3 Fragment Offset 13 Time to Live 8 Protocol 8 Header Checksum 16 Source Address 32 Destination Address 32 Data (UDP Packet) Total (without data) 160 bit_rate_calculation_3_0.odt 7
8 UDP Packet ( Source Port 16 Destination Port 16 Length 16 Checksum 16 Data (RTP Packet) Total (without data) 64 RTP Packet ( Ver. 2 P, X, CC, M, Payload Type 14 Sequence Number 16 Timestamp 32 SSRC identifier 32 Payload (Audio Packet) (+32)* Total (without data) 128 * the MP3 data are transferred in the MPA wrapper (inside the RTP payload), which has an extra 32 bit header. Total Bits of per Packet Packet Ethernet 300 IP 160 UDP 64 RTP 128 Total 652 The values of for audio format, are the same of table above, since the transmission protocol doesn't affect audio bit rate. bit_rate_calculation_3_0.odt 8
9 = Packet x Total Bit = + (1 Kbit = 1000 bit) quality 0, stereo quality 4, stereo quality 7, stereo (bit) Total Bit bit_rate_calculation_3_0.odt 9
10 (STL) (bit)* Bit Wireshark (Mbit/)** ALaw 8 Khz, mono KHz mono KHz mono 12 KHz mono 16 KHz mono KHz mono 24 KHz mono 32 KHz mono 44.1 KHz mono 48 KHz mono 8 KHz stereo KHz stereo 12 KHz stereo 16 KHz stereo KHz stereo 24 KHz stereo 32 KHz stereo 44.1 KHz stereo KHz stereo * in PCM and A/ULaw streaming mode, there is not MPA wrapper. ** 1 Mbit = 1000 Kbit bit_rate_calculation_3_0.odt 10
11 Total Bits of per Packet (without Ethernet ) Packet IP 160 UDP 64 RTP 128 Total 352 quality 0, stereo quality 4, stereo quality 7, stereo without Ethernet (bit) Total Bit without Ethernet bit_rate_calculation_3_0.odt 11
12 (STL) without Ethernet (bit)* Bit Wireshark (Mbit/)** ALaw 8 Khz, mono KHz mono KHz mono 12 KHz mono 16 KHz mono KHz mono 24 KHz mono 32 KHz mono 44.1 KHz mono 48 KHz mono 8 KHz stereo KHz stereo 12 KHz stereo 16 KHz stereo KHz stereo 24 KHz stereo 32 KHz stereo 44.1 KHz stereo 48 KHz stereo bit_rate_calculation_3_0.odt 12
13 * in PCM and A/ULaw streaming mode, there is not MPA wrapper. ** 1 Mbit = 1000 Kbit bit_rate_calculation_3_0.odt 13
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