The computed checksum is placed in the B3 byte before scrambling
B3 Byte (STS Path BIP)
C2 byte (STS path signal label)
Indicate the type of payload being transported in the STS, SPE, including the status of the mapped payloads.
The table below indicates the standard C2 binary values:
C2 Byte (STS Path signal label)
C2 byte structure per GR.253 recommendations
Code[hex]
Payload type
00
Unequipped
01
Equipped non-specific (standard payload)
02
Floating VT mode
03
Locked VT mode
04
Asynchronous mapping for DS3
12
Asynchronous mapping for 139.264Mbps
13
Mapping for ATM
14
Mapping for DQDB
15
Asynchronous mapping for FDDI
16
Mapping for HDLC over SONET
E1
STS-1 payload with 1 VT-x payload defect
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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