Nortel Networks Circuit Card 311 - Manual (Page 273)

Electrical specifications 273
Table 112
LEI card - line interface unit electrical characteristics
Characteristics Description
Framing CRC-4 or FAS, only
Coding AMI or HDB3
Signaling Loop or ground start A/B robbed-bit
Distance to LTU 0-199.6 meters (0-655 feet)
Power requirements
Table 113 "LEI card - power required" (page 273) shows the voltage and
maximum current that the LEI requires from the backplane. One NT8D06
IPE Power Supply AC or NT6D40 IPE Supply DC can supply power to
a maximum of eight LEIs.
Table 113
LEI card - power required
Voltage Max. Current
5.0 V dc 1.6 Amp
+15.0 V dc 150 mA
-15.0 V dc 150 mA
Foreign and surge voltage protections
In-circuit protection against power line crosses or lightning strikes is not
provided on the LEI. It does, however, protect against accidental shorts to
–52 V dc analog lines.
When the card is used to service off-premise terminal equipment through
the public telephone network, install a Line Termination Unit (LTU) as part of
the terminal equipment to provide external line protection.
Environmental specifications
Table 114 "LEI card - environmental specifications" (page 273) shows the
environmental specifications of the LEI.
Table 114
LEI card - environmental specifications
Parameter Specifications
Operating temperature – normal 15

to +30

C (+59

to 86

F), ambient
Operating temperature – short term 10

to +45

C (+50 to 113

F), ambient
Operating humidity – normal 20% to 55% RH (non-condensing)
Operating humidity – short term 20% to 80% RH (non condensing)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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