Nortel NT1R20 Description page 114

Page 90 of 290 NT5D11 Line-side T1 Interface Card
553-3001-105 Standard 5.00 June 1999
DSX-1 length
Estimate the distance between the line-side T1 card and the hardwired local
CPE or the Telco demarc RJ48 for the carrier facility connecting the line-side
T1 and the remote CPE. Make your selection for this dip switch position
based on this distance.
Line supervision on T1 failure
This setting determines in what state all 24 ports of the line-side T1 card will
appear to the Meridian 1 in case of T1 failure. Ports can appear to the
Meridian 1 as either in the on-hook or off-hook states on T1 failure.
Note: All idle line-side T1 lines will go off-hook and seize a Digitone
Receiver when the off-hook line processing is invoked on T1 failure.
This may prevent DID trunks from receiving incoming calls until the
line-side T1 lines time-out and release the DTRs.
Daisy-Chaining to MMI
If you plan to install two or more line-side T1 cards and you plan to use the
MMI, you will want to daisy-chain your cards together to use one MMI
terminal or modem (see Figure 25 on page 105). Make your selection for this
dip switch position based on how many line-side T1 cards you are installing.
MMI Master or Slave
This setting is used only if you are daisy-chaining your cards to the MMI
terminal or modem. It determines whether this card is a master or a slave in
your MMI daisy-chain. Select the master setting if this card is the card that is
cabled directly into the MMI terminal or modem; select the slave setting if
this card is cabled to another line-side T1 card in a daisy chain.