Nortel NT1R20 Description page 170

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553-3001-105 Standard 5.00 June 1999
NT5D33 and NTRB34 Line-side E1 Interface Cards
Line Supervisory Signaling protocol
The LEI 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 LEI to the MMI
The address of the LEI 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 to create a unique address for the card. The
MMI reads the address of the card within the shelf from the card firmware;
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 E1 IPE shelves (a maximum of 64 LEI 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.
E1 framing
The LEI is capable of interfacing with LTU equipment either in CRC-4 or
FAS only framing mode. Make your selection for this dip switch position
based on what type of framing your LTU equipment supports.
E1 Coding
The LEI is capable of interfacing with LTU equipment using either AMI or
HDB3 coding. Make your selection for this dip switch position based on the
type of coding your LTU equipment supports.
Line supervision on E1 failure
This setting determines in what state all 30 LEI ports will appear to the
Meridian 1 in case of E1 failure. Ports can appear to the Meridian 1 as either
in the "on-hook" or "off-hook" states on E1 failure.