Cisco ONS 15454 SDH Specifications Page 271

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6-19
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 6 Circuits and Tunnels
Creating a Path Trace
MANUAL TO WORKINGSwitches traffic to the working circuit path when the working path is
error free.
MANUAL TO PROTECTSwitches 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 verify that the selector switches as you expect.
6.8 Creating a Path Trace
Use a J1 path trace to monitor interruptions or changes to circuit traffic. The J1 path trace for each drop
port transmits a repeated, fixed-length string. If the string received at a circuit drop port along the circuit
does not match the string the port expects to receive, an alarm is raised. To set up path trace on the ports,
you must repeat the following procedure for each port. Table 6-2 shows the ONS 15454 SDH cards that
support path trace. Cards not listed in the table do not support the J1 byte.
Note There are two types of J1 bytes, high-order (HO-J1) and low-order (LO-J1). The electrical cards
support LO-J1 (VC3) and the optical cards support HO-J1 (VC4) and cannot monitor the LO-J1 byte.
Note Path trace is available for VC3 and VC4 circuits. In SDH Software R3.3, you can set the VC3 J1
transmit string on E3 and DS3i cards, but VC3 is not monitored by STM-N cards. The VC4 transmit
string cannot be set on the E3 and DS3i.
Table 6-2 ONS 15454 SDH Cards Supporting J1 Path Trace
J1 Function Card
Transmit and Receive E3
DS3i
G1000-4
Receive Only OC3 IR 4/STM1 SH 1310
OC48 IR/STM16 SH AS 1310
OC48 LR/STM16 LH AS 1550
OC192 LR/STM64 LH 1550
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