Nortel Networks Circuit Card 311 - Manual (Page 275)

Installation and Configuration 275
When the LEI card is oriented as shown in Figure 59 "LEI card - E1 protocol
dip switch locations" (page 276) , the dip switches are ON when they are up,
and OFF when they are down. The dip switch settings configure the card
for the following parameters:
MMI port speed selection
This dip switch setting selects the appropriate baud rate for the terminal or
modem (if any) that is connected to the MMI.
Line Supervisory Signaling protocol
The LEI is capable of supporting loop start or ground start call processing
modes. Make the selection for this dip switch position based on what type of
line signaling the Customer Premise Equipment (CPE) supports.
Address of LEI to the MMI
The address of the LEI to the MMI is made up of two components:
• the address of the card within the shelf
• 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 to 15, 16 being the maximum
number of lineside E1 IPE shelves (a maximum of 64 LEI cards) capable of
daisy chaining to a single MMI terminal. For ease, it is recommended that
this address be set the same as the address of the peripheral controller
identifier in LD 97 for type: XPE. This is not possible because the dip switch
is limited to 16; however, this is not mandatory.
E1 framing
The LEI is capable of interfacing with LTU equipment either in CRC-4 or FAS
only framing mode. Make the selection for this dip switch position based on
what type of framing the LTU equipment supports.
E1 Coding
The LEI is capable of interfacing with LTU equipment using either AMI or
HDB3 coding. Make the selection for this dip switch position based on the
type of coding the LTU equipment supports.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
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