GAI-Tronics L3149B C200 Advanced Deskset - Manual (Page 36)

Installation L3149B (C200) Advanced Tone Remote Desk Set
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Line Connections for the L3149B Desk Set
Connect the telephone line to the modular connector located on the back of the desk set.
Telephone Line Pinout
Pins Function
Pin 1 N/C
Pin 2 4-wire TX +IN
Pin 3 2-wire RX +OUT/TX IN
Pin 4 2-wire RX –OUT/TX IN
Pin 5 4-wire TX –IN
Pin 6 N/C Telephone Line Connector
The six-pin modular jack is a full/half duplex connection to the line. The programming software allows
selection of a four-wire type of connection to the line. In the two-wire mode, the hybrid is auto-
balancing. A maximum of ten desk sets can be connected in parallel. The maximum loss between any
two desk sets or between a desk set and the station should not exceed 20 dB. Desk sets are shipped with
line terminations active. With parallel units connected, only the farthest desk set units should be
terminated. Observe right to left pinout for pins 1 through 6.
Line Considerations - Private Circuit
If leased lines from your local telephone company are used between the desk sets and the tone remote
adapter, the telephone company (Local Exchange Carrier) may request a Facility Interface Code (FIC).
The FIC is subject is to local availability.
Analog Facility Interface Code
FIC Description
02NO2 2-wire private line; no signaling conversion by LEC (IN-Band).
02NO4 4-wire private line; no signaling conversion by LEC (IN-Band).
Metallic 2- or 4-wire metallic private line (‘Hoot and holler’ circuits).
Within a manufacturing plant, a campus, or large building, customer-supplied “metallic pairs” may be
used. It is not necessary to have dc continuity on these lines.
Circuit Conditioning
The desk set is designed to work with good quality analog speech band or leased private circuit. This
was previously known as “basic” conditioning under Series 2000/3002 service. The line must be
non-PSTN (no dial tone, talk-battery, or signaling). This equipment falls under the Category II,
Tariff #260 Service and is exempt from FCC Part 68 registration. (Ref. FCC Form 730 Application
Guide pages 1–5.)
For two-wire operation, 2000 Series lines may be used with or without conditioning. C1 or C2
conditioning is available for these lines and relates to the envelope delay distortion and attenuation. A
basic conditioned line may be used if it is the only type available. Overall system quality is limited by
the quality of the lines.