Nortel NT1R20 Description page 124

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553-3001-105 Standard 5.00 June 1999
NT5D11 Line-side T1 Interface Card
Cabling from the I/O panel at the Main Distribution Frame
You may also choose to make all line-side T1 connections at the main
distribution frame (MDF) if you prefer not to use the NT5D13AA Line-side
T1 I/O cable at the I/O panel. To make the connections at the MDF, follow
this procedure:
1 Punch down the first eight pairs of a standard telco 25-pair
female-connectorized cross-connect tail starting with the first tip and
ring pair of the line-side T1 motherboard card slot on the cross-connect
side of the MDF terminals.
2 Plug the NT5D13AA Line-side T1 I/O cable into this 25-pair
cross-connect tail at the MDF, regardless of the card slot restrictions that
exist from the vintage level of IPE or CE/PE module you have. You can
also make this connection at the MDF without using the NT5D13
Line-side T1 I/O cable, by cross-connecting according to the pinouts in
Table 24.
3 Turn over the T1 transmit and receive pairs, where required for
hardwiring the line-side T1 card to local CPE T1 terminal equipment.
The backplane connector is arranged as an 80-row by 2-column array of pins.
Table 24 shows the I/O pin designations for the backplane connector and the
25-pair Amphenol connector from the I/O panel. Although the connections
from the I/O panel only use 14 of the available 50 pins, the remaining pins are
reserved and cannot be used for other signaling transmissions.
The information in Table 24 is provided as a reference and diagnostic aid at
the backplane, since the cabling arrangement may vary at the I/O panel. See
Meridian 1 system installation procedures (553-3001-210) for cable pinout
information for the I/O panel.
Table 25 shows the pin assignments when using the NT5D13AA Line-side
T1 I/O cable.