Foreign And Surge Voltage Protections; Environmental Specifications - Nortel NT1R20 Description

Page 86 of 290 NT5D11 Line-side T1 Interface Card

Foreign and surge voltage protections

Environmental specifications

Table 17
Line-side T1 card—environmental specifications
Parameter
Operating temperature-normal
Operating temperature-short term
Operating humidity-normal
Operating humidity-short term
Storage temperature
Storage humidity
553-3001-105 Standard 5.00 June 1999
In-circuit protection against power line crosses or lightning is not provided on
the line-side T1 card. 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 channel service unit (CSU) as part of your
terminal equipment to provide external line protection.
Table 17 shows the environmental specifications of the line-side T1 card.
Specifications
15° to +30° C (+59° to 86°F), ambient
10° to +45° C (+50° to 113°F), ambient
20% to 55% RH (non-condensing)
20% to 80% RH (non-condensing)
–50° to +70° C (–58° to 158°F), ambient
5% to 95% RH (non-condensing)