Table 11-9 Ons 15454 Cards Capable Of J1 Path Trace; Path Signal Label, C2 Byte - Cisco ONS 15454 Reference Manual

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Transmit and Receive

Receive Only

1. J1 path trace is not supported for DS-1s used in VT circuits.

If the string received at a circuit drop port does not match the string the port expects to receive, an alarm

is raised. Two path trace modes are available:

11.13 Path Signal Label, C2 Byte

One of the overhead bytes in the SONET frame is the C2 byte. The SONET standard defines the C2 byte

as the path signal label. The purpose of this byte is to communicate the payload type being encapsulated

by the STS path overhead (POH). The C2 byte functions similarly to EtherType and Logical Link Control

Cisco ONS 15454 Reference Manual, R7.0.1

ONS 15454 Cards Capable of J1 Path Trace

OC3 IR 4/STM1 SH 1310

OC3 IR 4/STM1 SH 1310-8

OC48 IR/STM16 SH AS 1310

OC48 LR/STM16 LH AS 1550

OC192 SR/STM64 IO 1310

OC192 LR/STM64 LH 1550

OC192 IR/STM SH 1550

Automatic—The receiving port assumes that the first string it receives is the baseline string.

Manual—The receiving port uses a string that you manually enter as the baseline string.

Circuits and Tunnels