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6-12
Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter 6 Circuits and Tunnels
Creating a Path Trace
FORCE TO PROTECT—Forces traffic to switch to the protect circuit path, regardless of whether
the path is error free.
MANUAL TO WORKING—Switches traffic to the working circuit path when the working path is
error free.
MANUAL TO PROTECT—Switches traffic to the protect circuit path when the protect path is error
free.
Caution The FORCE and LOCKOUT commands override normal protection switching mechanisms.
Applying these commands incorrectly can cause traffic outages.
Step 6 Click Apply, then check that the selector switches as you expect.
6.7 Creating a Path Trace
The SONET J1 Path Trace is a repeated, fixed-length string comprised of 64 consecutive J1 bytes. You
can use the string to monitor interruptions or changes to circuit traffic. Table 6-1 shows the ONS 15454
cards that support path trace. DS-1 and DS-3 cards can transmit and receive the J1 field, while the EC-1,
OC-3, OC-48AS, and OC-192 can only receive it. Cards not listed in the table do not support the J1 byte.
The J1 path trace transmits a repeated, fixed-length string. 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:
• Automatic—The receiving port assumes the first J1 string it receives is the baseline J1 string.
• Manual—The receiving port uses a string that you manually enter as the baseline J1 string.
Table 6-2 shows the general flow for setting up the J1 path trace. To set up a path trace on an ONS 15454
circuit, follow the steps in the “Create a J1 Path Trace” procedure on page 6-13.
Table 6-1 ONS 15454 Cards Supporting J1 Path Trace
Card Receive Transmit
DS1-14 X X
DS1N-14 X X
DS3-12E X X
DS3N-12E X X
DS3XM-6X X X
EC1-12 X
OC3 IR 4 1310 X
OC48 IR/STM16 SH AS 1310 X
OC48 LR/STM16 LH AS 1550 X
OC192 LR/STM64 LH 1550 X