Wireshark-bugs: [Wireshark-bugs] [Bug 9427] Dissector for T1-channels-over-raw-Ethernet protocol
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Sat, 23 Nov 2013 21:06:08 +0000

Comment # 33 on bug 9427 from 
It's my first time with T1, but I read a little, and there's information about
T1 frame being 193 bytes.

In capture file we have only 192 bits (24 bytes).

It's not a problem if ESF is used for framing? Reading about ESF [1] there's
note that some bits from 24-frame-ESF might be used for data.


One more thing, looking at payload data:

0000000: 3d3f 1f3f 3f1f 3d3f 3e7a 5f7f 3f3f 7f20  =?.??.=?>z_.??. 
0000010: 2020 2020 4040 4040 4040 4040 4040 4060      @@@@@@@@@@@`
0000020: 2020 202f bfbf bfbf bfbf bfbf bf9f dfdf     /............
0000030: dfdf dfdf dfdf dfdf 0101 0101 0101 0101  ................
0000040: 0101 0101 0101 0101 0101 0101 0101 0101  ................
...
0001a70: bbbf ffbb bfff bb80 8044 4000 4440 0044  .........D@.D@.D
0001a80: 4000 2420 4048 40c0 4840 c048 0121 0301  @.$ @H@.H@.H.!..
0001a90: 2103 0121 0301 2102 0341 0480 c084 81b9  !..!..!..A......
0001aa0: f9f9 b9f9 f373 f3f9 79f1 f979 f1f9 79f1  .....s..y..y..y.

patterns repeats too often for me. Do we need to decode T1 payload before
passing it to upper layer (frame relay?) ?


btw. Mike, could you send details about 'GUISYS calculated CRC'? like what's
polynomial is used?

Thanks.

[1] http://en.wikipedia.org/wiki/Extended_superframe

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