Nortel Networks 553-3001-211 manual Foreign and surge voltage protections

NT5D11 and NT5D14 Lineside T1 Interface cards Page 191 of 894

Power requirements

The lineside T1 card requires +15 V, –15 V, and +5 V from the backplane. One NT8D06 IPE Power Supply AC or NT6D40 IPE Power Supply DC can supply power to a maximum of eight lineside T1 cards. See Table 73.

Table 73

Lineside T1 card – power required

Voltage	Current (max.)
+ 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 is not provided on the lineside T1 card. It does 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 Channel Service Unit (CSU) as part of the terminal equipment to provide external line protection.

Circuit Card Description and Installation