TABLE MAXIMUM CABLE LENGTH
STATION
LOOP RESISTANCE
CABLE LENGTH
TS-616
8 4 0 h m s
l
490m
TS- 1236
7 4 0 h m s
l
430m
TS-2260
6 4 0 h m s
l
370m
DSS-6161236
52
Ohms
300m
DSS-2260
48
Ohms
280m
* These figures must be reduced by 10 Ohms or 60m if a Handsfree Console is attached to a
station.
Station internal wiring is shown in figure 49.
2.4.8
Powerfail Stations
FIGURE 47
CONNECTOR AND SDF TERMINATIONS
FOR POWERFAIL STATIONS
Jumpering is required at the S.D.F. when cabling for powerfail stations. This cabling allows
assigned stations to access an exchange line under powerfail conditions. Refer to figure 47 for
method of connection, n stands for station number and x is the exchange line number.
For powerfail stations, jumper the station A-pair,
and nAL2 of the
connections, to
the powerfail strap
STRAPS) connections
and
corresponding to the exchange line
that is to be connected to the station under powerfail conditions. In this case the A-pair that is to
be cabled to the powerfail station is the
and
connections of the PF STATION A PAIR.
They will be cabled as
white
and
blue
The B pair that is cabled to the
powerfail station is the normal nBD+
and
of the
connections.
Refer to table 10 and figure 50 for the dial leads connection to STB-B terminals. Note BK from
the dial is connected to the BK terminal on STB-B if a handsfree console is not used.
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ISSUE 1