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Creating a Path Trace
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.
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.
Table 6-1
Card
DS1-14
DS1N-14
DS3-12E
DS3N-12E
DS3XM-6X
EC1-12
OC3 IR 4 1310
OC48 IR/STM16 SH AS 1310
OC48 LR/STM16 LH AS 1550
OC192 LR/STM64 LH 1550
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:
•
•
Table 6-2
circuit, follow the steps in the
Cisco ONS 15454 Installation and Operations Guide
6-12
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.
ONS 15454 Cards Supporting J1 Path Trace
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.
shows the general flow for setting up the J1 path trace. To set up a path trace on an ONS 15454
Receive
Transmit
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
"Create a J1 Path Trace" procedure on page
Chapter 6
Circuits and Tunnels
Table 6-1
shows the ONS 15454
6-13.
November 2001
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