Comdial G0408 Manual page 94

Digital Telephone System
Installing An OPX Long Loop Adapter For Off-Premise Service
As stated previously, the analog terminal interface is an on-premise device. You must use an
OPX long loop adapter if you wish to adapt the ATI-D to support an off-premise application. An
OPX long loop adapter connects to a single telephone line and can greatly extend the line's loop
length (the Proctor Model 46222 adapter*, for example, can extend line length to 30,000 feet).
*Proctor & Associates Company, Redmond WA
When you connect an adapter to an off-premise extension (OPX), you must install primary
protectors in series with the tip/ring pair of the telephone line that is routed to the OPX. This
action is necessary to protect both the user and the equipment from transient voltage spikes
that can travel through the cable. The telephone company offers basic protection against this
condition; however, that protection is usually designed to safeguard the central office circuits
and you cannot rely upon it to protect common equipment. To help insure that external
overvoltage surges do not damage the system, installation specialists recommend that you
install and properly ground gas discharge tubes or similar primary protection devices on the
telephone line that routes between the adapter and the OPX.
To install the OPX long loop adapter:
• Follow manufacturer's instructions for unpacking, inspecting, mounting and wiring the
adapter unit.
• Plug a modular cable into the system jack on the adapter and connect the opposite end of
the cable to the IST jack on the ATI-D.
• Plug a modular cord into the telephone jack on the adapter and connect the opposite end of
the cord to the OPX line (see Figure 4).
• Plug the adapter power cord into a standard 117 VAC, 3-wire electrical outlet.
2 – 64 Installing The DSU
CAUTION
IMI66–107