Nortel DCT1900 Technical Product Manual page 270

Technical Product Manual - DCT1900
Installation Instructions, Modular Cabinet – CPU Cabling
should be on the left, with the pins facing towards you. Pin A1 is in the upper left corner, while pin
C7 is in the lower right corner.
Note: There are no pins in rows 2, 4, or 6. The pins that will be utilized for the Sync signal are
pins A3 and C5 (blue pair). The same pin-out is used for both the input and the output connectors.
A B C A B C
1 1
2 2
3 3
4 4
5 5
6 6
7 7
Connection of the Sync Cable
CPU1 to CPU1 (Figure 20-5)
When connecting a CPU1 to another CPU1, it is only necessary to connect the output of the
master to the input of the slave. Locate an output position, insert the cable, and plug the other end
into the slave CPU input. Enter the delay into the slave CPU configuration, and ensure that the
option straps are set properly (Refer to Section 5, Chapter 5, CPU1 Board). Once this information
is entered, and the straps are set properly, create a service report using CSMW and check the
slave CPU. It should show SLAVE, SYNC AVE.
For runs up to 25 feet, the cable provided has a delay of 40 nanoseconds. For runs longer than 25
feet, it will be necessary to cut the provided cable, and terminate it at the punch down blocks at
both ends. Cross connect the blue pair (straight connection), and using a Time Domain
Reflectometer (TDR), read the delay in nanoseconds, and enter the value into the slave CPU.
20-6
Connecting CPU1 to CPU1
25 feet
White/Blue
Blue/White
This is a straight through cable.
Connect pins A3 on both ends (White/Blue)
Connect pins C5 on both ends (Blue/White)
Note: The Sync Pulse in on pins A3 and C5.
The cable delay is 40 nanoseconds at 25 feet (entered in the Slave(s) configuration)
No SDB required.
Connect from Master output(s) to Slave Input. For runs more than 25 feet, cut the cable
and cross-connect at main frame using White/Blue and Blue/White. Measure delay and enter into
Slave configuration in nanoseconds.
Fig. 20-5 CPU1 Sync Replacement Cable (AWS1154)
A B C A B C
1 1
Master
2 2
3 3
4 4
5 5
6 6
7 7
Slave 1
Slave 2
Slave 3
Install-DCT1900/R8/mw
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