20-15
Cisco ONS 15454 SDH Procedure Guide, R7.0
78-17194-01
Chapter 20 DLPs D300 to D399
DLP- D325 Install Timing Cables on the MIC-C/T/P
DLP-D325 Install Timing Cables on the MIC-C/T/P
Step 1 Using coaxial cable with 1.0/2.3 miniature coax connectors, connect the clock cable to the appropriate
connector on the faceplate of the MIC-C/T/P FMEC.
Step 2 Gently push the cable with the 1.0/2.3 miniature coax connector down until the cable connector slides
into the 1.0/2.3 miniature coax connector on the faceplate with a click.
The MIC-C/T/P provides 1.0/2.3 miniature coax connectors that are used for timing input and output.
The top connectors are for “A” (BITS-1) timing, and the bottom connectors are for “B” (BITS-2) timing.
In each case, the left connector is the input and the right connector is the output. The input connectors
for timing provide a 75-ohm termination. System cables are available that can convert timing clocks
from 75 ohms to 100/120 ohms. Table 20-2 shows MIC-C/T/P pin assignments.
A high-impedance option (> 3 kilo-ohms or greater) is possible through a jumper on the MIC-C/T/P
FMEC. You can change the top timing input to high impedance by removing the jumper on P3 on the
MIC-C/T/P FMEC. You can change the bottom timing input to high impedance by removing the jumper
on P2 of the MIC-C/T/P FMEC.
Note Refer to ITU-T G.813 for rules about provisioning timing references.
Step 3 Connect the other end of the cable to the external source of the timing signal according to Table 20-2.
Step 4 Repeat Step 3 for each cable that is required.
Step 5 Return to your originating procedure (NTP).
Purpose This task installs the timing cables on the MIC-C/T/P FMEC.
Tools/Equipment 75-ohm coaxial cable with a 1.0/2.3 miniature coax connector on the
MIC-C/T/P side
Prerequisite Procedures NTP-D220 Install the Power and Signal FMECs, page 1-7
Required/As Needed As needed
Onsite/Remote Onsite
Security Level None
Table 20-2 MIC-C/T/P Clock Connector Pin Assignment
Pin Function
IN 1 Input from external device
OUT 1 Output to external device
IN 2 Input from external device
OUT 2 Output to external device
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