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Circuit Card Description and Installation
180
NT1R20 Off-Premise Station
Analog Line card
Contents
This section contains information on the following topics:
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Physical description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Functional description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Electrical specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Connector pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Configuring the OPS analog line card. . . . . . . . . . . . . . . . . . . . . . . . . . 172
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Introduction
The NT1R20 Off-Premise Station (OPS) analog line card is an intelligent
eight-channel analog line card designed to be used with 2-wire analog
terminal equipment such as analog (500/2500-type) telephones and analog
modems.
The NT1R20 Off-Premise Station (OPS) analog line card provides eight
full-duplex analog telephone line interfaces. Each line has integral hazardous
and surge voltage protection to protect the system from damage due to
lightning strikes and accidental power line connections. This card is normally