Nortel Networks 553-3001-211 manual NT1R20 Off-Premise Station Analog Line card Page 175

NT1R20 Off-Premise Station Analog Line card Page 175 of 894

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 can 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 Figure 25 on page 176.

Note: Do not confuse OPS service with Off-Premise Extension (OPX) service. OPX service is the provision of an extension to a main subscriber loop bridged onto the loop at the serving CO or PBX. Do not confuse CLS OPS (assigned in the Analog (500/2500-type) Telephone Administration program LD 10) with OPX, which denotes Off-Premise Extension service.

Circuit Card Description and Installation