.
The unit is capable of counting meter pulses for three exchange lines. Terminate the exchange lines on the
CMU before terminating them at the SDF. The CMU derives its power from the main equipment,
connector
Make connections between CMU+ and CMU- via the SDF to + and
respectively, on the CMU. A Telecom metering earth is required to detect meter pulses and this must be
connected to the CMU. (Refer to fig.
2.4.9
Tie Lines
TIE LINE TO
RING
RING OUT
LOOP IN LOOP OUT
TIE LINE TO
M.E. VIA SDF
2 A
2WT
2BL
2 R D
2BK
TERMINAL
DESIGNATION
Fig. 2.4.9
TERMINAL CONNECTIONS
Boards are simply plugged into the designated slots in the RTIU. Terminal connections are as follows (refer
fig.
A Tie Line takes the place of an exchange line. Hence the Exchange Line Key now becomes a Tie Line Key
for the appropriate line. The line terminates on 1 A/B or
on the
and the connection to the main
equipment is taken from 1
or
respectively. Insert LRB-A or RRB-A in slot RXB-A-1 or
RXB-A-2 respectively and an RTB-A in slot RTB-A. 221FB is not used.
I
TIE LINE
TERMINAL
MAIN EQUIPMENT TERMINAL
A
B
2
B
L
Table 2.4.9
TIE LINE CONNECTION
Two-Wire Standard Telephone Stations
Install the
board(s) into the required SLB-AN position(s) in the main equipment and mount the
ring generator
near the SDF. In case of standard telephone stations with loop lengths less than
300 ohms, short out pins 2 and 3 of connectors
and S2 on the
For stations with loop
lengths greater than 300 ohms, refer to section 2.4.1 1.
47
AN-61 6
ISSUE 1