2.4.5
Exchange Lines
The exchange lines are terminated on the S.D.F. If a call metering unit is used, the exchange
lines must be terminated on the CMU before being terminated on the S.D.F.
The order in which the exchange lines are terminated at the main equipment is important when
assigning audible signalling groups.
Refer to figure 46, x represents the exchange line number.
__
E X C H A N G E L I N E S
LINE
PAIRS
E X C H A N G E L I N E
E X C H A N G E L I N E
L I N E S
L I N E S
W T
B L
T O S T A T I O N S
V I A S D F
CONNECTOR
C O N N E C T O R
(1236 J
( 1 2 3 6
( 2 2 6 0 A ,
FIGURE 46
CONNECTOR TERMINATIONS
FOR STANDARD STATIONS
2.4.6
Earth Recall
When the system is connected to a PBX and the recall facility is required, the PBX earth must be
connected to the ER connections via the S.D.F.
2.4.7
Stations and DSS Console
When cabling from the main equipment to the stations take care that the pairs are correctly
terminated and the polarity of the pair is correct. Fuses in the main equipment will blow or the
equipment will not operate if the system is not correctly cabled. The order in which stations are
connected and the station number are important when assigning paging zones.
Refer to figure 46, n represents station number
TABLE 6 STATION CABLING
WIRE
603 PLUG/61 0
WIRE COLOUR
DESIGNATION
DESIGNATION
SOCKET
STATION DSS
2
WT White
LWT
nAL2
6
BL Blue
LBL
n B D +
1
RD Red
LRD
5
BK Black
LBK
Provision must be made to allow for connection of both a DSS station and a DSS console for
programming and testing. If the customer has not requested a DSS console, the DSS station and
DSS console point must be cabled and located near the ME/SDF.
When cabling for stations the following limitations apply for
twisted 2 pair cable.
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ISSUE 1