Nortel NT1R20 Description page 113

Line Supervisory Signaling protocol
As described in "Line-side T1 call operation" on page 40, the line-side T1
card is capable of supporting loop start or ground start call processing modes.
Make your selection for this dip switch position based on what type of line
signaling your CPE equipment supports.
Address of line-side T1 card to the MMI
The address of the line-side T1 card to the MMI is made up of two
components:
1 The address of the card within the shelf
2 The address of the shelf in which the card resides
These two addresses are combined create a unique address for the card. The
MMI reads the address of the card within the shelf from the card firmware;
however the address of the shelf must be set by this dip switch.
The shelf address dip switch can be from 0-15, 16 being the maximum
number of line-side T1 IPE shelves (a maximum of 64 line-side T1 cards)
capable of daisy chaining to a single MMI terminal. For clarity and ease, it is
recommended that this address be set the same as the address of the peripheral
controller identifier in overlay 97 for type: XPE. However, this is not
mandatory, and, since the dip switch is limited to 16, this will not always be
possible.
T1 framing
The line-side T1 card is capable of interfacing with CPE or CSU equipment
either in D4 or ESF framing mode. Make your selection for this dip switch
position based on what type of framing your CPE or CSU equipment
supports.
T1 Coding
The line-side T1 card is capable of interfacing with CPE or CSU equipment
using either AMI or B8ZS coding. Make your selection for this dip switch
position based on what type of coding your CPE or CSU equipment supports.
NT5D11 Line-side T1 Interface Card Page 89 of 290
Line cards Description