Station A and B pairs are accessed at the quick connect terminals LWT, LBL, and LRD, LBK
respectively, which are on the STB-B board. These are illustrated in figures 49 and 50.
Similarly, the DSS Console A and pairs are accessed at the quick connect terminals LWT,
LBL, LRD and LBK, which are on the DSSB-A board. These are illustrated in figure 67.
Note:
TABLE 17 STATION AND DSS CONSOLE VOLTAGES
603 PLUG
PIN
VOLTAGES
Station Voltages:
A Pair
LWT
2
LBL
6
B Pair
LRD
1
LBK
5
REF
DSS Console:
A Pair
LWT
2
LBL
6
B Pair
LRD
1
LBK
5
REF
The 616 DSS Console A Pair voltage is
when using the DSS port
on the
EDTB-B board.
3.2.4
Handsfree Console
This unit is connected to the STB-B board in the associated station. Refer to figures 48, 49 and
50.
The power test point is accessed on the STB-B board. The power to the console is accessed via
the terminals ‘RB’ (Ground) and ‘SG’
V). Check that the
switch in the Handsfree
Console is switched to the 20V position.
3.2.5
Remote Extension and Tie Line Interface Unit
Test points are accessed on the side of the unit as shown in figure 52.
The
contains two circuits, terminals are prefixed by “1” for the first circuit and
for the
second circuit.
When a remote extension is installed, the station A and B pairs from the main equipment are
connected to ‘WT’, ‘BL’, and ‘RD’, ‘BK’ terminals respectively. The remote extension connects to
the A and B terminals.
When a tie line is interfaced to the main equipment the terminals ‘WT’ and ‘BL’ are connected to
the main equipment exchange line inputs. Terminals ‘A’ and ‘B’ are connected to the tie line.
The voltage across terminals ‘A’ and ‘B’ for a loop-in ring-out tie line should be
There
should be no DC voltage across the terminals for a ring-in ring-out tie line.
3.2.6
Call Metering Unit
Power to the CMU can be accessed via the
and terminals. The nominal voltage is 30V
which is supplied from the main equipment via the SDF.
Incoming exchange lines are connected to ‘LA’ and ‘LB’ terminals first, and connected to the
SBS via terminals ‘A’ and ‘B’.
3.2.7
Ring Generator Unit
The RGU is connected to the main equipment when internal extensions are used.
Power to the RGU can be accessed on the terminals
V and G (Ground) on the RGBB-A
board contained within the RGU. The frequency of the ring voltage is 16Hz (nominal) which is
accessed on the terminals
and ‘OUT’, also contained within the RGU. The ring voltage is
approximately 70V RMS (measured with multimeter).
122
ISSUE 1