Page432 of 544 NT1R20Off Premise Station (OPS) analog line card
553-3011-100 Standard14.00 January 2002
Application
Off-premise station application
The NT1R20 Off-Premise Station (OPS) Analog Line Card is designed
primarily to provide an interface for Meridian 1 off-premise station lines. An
OPS line serves a terminal—typically, but not exclusively, a telephone set—
remote from the PBX either within the same serving area as the local office
or through a distant office. The line is not switched at these offices; however,
depending on the facilities used, the local office serving the OPS station may
provide line functions such as battery and ringing. Facilities are generally
provided by the local exchange carrier (usually, OPS pairs are in the same
cable as the PBX-CO trunks). The traditional OPS scenario configuration is
shown in Figure56.
Far end station
hangs up first
High resistance loop If the far-end hangs-up first, Option 11C
detects disconnect signalling from the
trunk. The person at the near-end
recognizes the end of the call and
hangs-up.
Line card unit idle Ground on tip/battery on ring
High resistance loop
Line card unit is ready for the next call.
Call connection sequence—near-end station receiving call(Part 2 of 2)