6-1
Chapter 6 Connecting Central
Office Circuits
Safety Precautions
Use caution when installing or modifying telephone lines. To limit the risk of personal injury, al-
ways follow these precautions before connecting Central Office (C.O.) circuits:
● ! Never install telephone wiring during a lightning storm.
● ! Never install telephone jacks in a wet location unless the jack is specifically designed for wet
locations.
● ! Never touch non-insulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
Loop Start Lines
Using one pair twisted #24 AWG (0.5mm) or #26 AWG (0.4mm) jumper wire, cross-connect each
loop start C.O. line to the Trunk B or 8TRK port of your choice (Figures 6-1 and 6-2
).
AC15 Tie Lines
Using two pair twisted #24 AWG (0.5mm) or #26 AWG (0.4mm) jumper wire, cross-connect each
tie line to the AC15 card port of your choice (Figure 6-3
).
Off Premise Extensions (OPX)
Using one pair twisted #24 AWG (0.5mm) or #26 AWG (0.4mm) jumper wire, cross-connect sin-
gle line telephone (SLT) extensions to telephone company OPX circuits (Figure 6-4
). Circuits on
the SLI card are specifically designed to meet telephone company requirements for OPX use.
These circuits are provided with the same over-voltage and over-current protection as that of
C.O. line circuits. Using SLTs on any other SLI card or a KDB-SLI requires the installation of ex-
ternally mounted protection devices.
There is no special programming required for OPX use; however, it is suggested that the OPX
ports are set for C.O. ring in MMC 208. The telephone company service facility interface code for
OPX circuits is OL13C.
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