Nortel Networks Circuit Card - Manual (Page 262)

Page 262 of 906 NT5D33 and NT5D34 Lineside E1 Interface cards
553-3001-211 Standard 3.00 August 2005
Power requirements
Table 94 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.
Foreign and surge voltage protections
In-circuit protection against power line crosses or lightning strikes is not
provided on the LEI. It does, however, have protection 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 95 shows the environmental specifications of the LEI.
Table 94
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
Table 95
LEI card – environmental specifications (Part 1 of 2)
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)