4TOLB-3L1
1306, Issue 2, May 1992
12
STEP ACTION
1 Plug the B105097 MAC Jack to Bantam Jack Adapter into the TEST jack on
the front panel of the near-end 4TOLB-3L1; arrange to have another adapter
installed into the TEST jack of the far-end unit.
2 Set the TMS1 in the bridged mode and adjust the TMS1 oscillator output for
a 1004-Hz tone at the desired TRMT input level (between +16 dB and
–16 dB TLP). Connect the oscillator to the TRMT IN port (connector pins 24
and 51) and the level meter to the TX TLP port (jack J2–TX TLP of the MAC
Jack to Bantam Jack Adapter).
3 Vary the near-end TRMT attenuation to achieve a level meter reading of
–8.5
±
0.25 dBm.
4 Arrange with the far end to set the TMS2 in the bridged mode, to
connect the TMS2 level meter to the RX TLP port (jack J2–RX TLP of the
MAC Jack to Bantam Jack Adapter), and to verify a level meter reading of
+4.0
±
0.25 dBm.
5 Arrange with the far end to move the TMS2 level meter to the RCV OUT port
(connector pins 20 and 47), to set the TMS2 in the terminated mode, and to
vary the RCV attenuation switches to attain the desired RCV output.
A. Near-End TRMT and Far-End RCV Alignment
Figure 7. TRMT, RCV, and LB Alignment Procedures and Test Equipment Setups
-8.5
±0.25
dBM
OSCILLATOR
1004 Hz
(+16 dB to -16 dB TLP)
TMS 1
(BRIDGED MODE)
SET TO
DESIRED
LEVEL
X
F
M
R
LEVEL METER
MAC TO BANTAM
ADAPTER
NEAR
END
9
1
7
3
0 to 32.5 dB
0 to 24 dB
T1
R1
TRANSMIT PATH
RECEIVE PATH
A
P/O
J2
TX
TLP
MODEL 4TOLB-3L1 UNDER TEST
P/O J1
P/O P1
+4.0
±0.25
dBM
DESIRED
RCV TLP
OUT
P/O TMS 2
(BRIDGED MODE)
MAC TO BANTAM
ADAPTER
FAR
END
7
3
9
1
P/O J1
P/O P1
T1
R1
TRANSMIT PATH
RECEIVE PATH
RX
TLP
LEVEL METER LEVEL METER
P/O TMS 2
(TERMINATED MODE)
+7.5
dB
+3
dB
TRMT
IN
T
R
24
51
B
P/O
J2
P/O J1
P/O P1
TO/FROM
CHAN. BANK
RCV
OUT
47
20
T
R
A
P/O
J2
P/O J1
P/O P1
B
P/O
J2
TO/FROM
CHAN. BANK
X
F
M
R
X
F
M
R
X
F
M
R
0 to ±31.75 dB
LB
LB
To Next Page
Loading...