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TELEPHONE INTERFACE MODULE (TIM)
14-16
d. Adjust R206 on the personality card for -12 dBm
±0.5 dB at EP221. Verify the level across the 600
ohm resistor and 2.2 µF cap is -16 dBm ±2 dB,
measure with a balanced non-grounded AC volt-
meter.
7. Set S5 for normal operation (all closed).
8. Reset the module, Press S2 and release.
14.9 DID OPERATIONAL ALIGNMENT
PROCEDURES (-660)
The DID line cannot dial numbers towards the
CO. This requires the card be pre-aligned and the
levels from the CO are known. A known good
working mobile or portable is required for the align-
ment of the DID line. Align the 2WY or DDO lines
first to obtain the line loss from the CO.
Call a mobile or portable that is active in the
system. Use a phone that can generate continuous
DTMF. Answer with the mobile or portable.
Receive
1. Press the "5" key on the DTMF phone.
This level should be about -6 dB from the Test
Tone on the transmitting phone. Verified by measuring
the transmitting telephone using a high impedance
ungrounded AC voltmeter across the line. Take note
of this level relative to the CO Test Tone level. The
level across the interface at the DID should be this
level plus twice the line loss as measured when setting
up a 2WY line.
2. Adjust R41 for the same relative level from +6 dBm
at J11 as measured in Step 1.
3. Adjust R214 for the same relative level from +6
dBm at EP203 as measured in Step 1.
4. Release the "5" key.
Transmit (Revision 202 or Earlier.)
5. Inject 1004 Hz tone at the junction of C61 and R69
using a 0.1 µF cap in series with a 600 ohm oscil-
lator. Adjust the oscillator level for a -3 dBm ±0.5
dB level at TP3.
6. Adjust R44 to add 8 dB, ±1 dB to the CO Test Tone
level at J12. Verify that the level across the line is
-12 dB, ±2 dB from the Test Tone level of the CO,
use a balanced non-grounded AC voltmeter.
7. Verify the level at the telephone is clean and clear.
Remove or cover the mouthpiece.
8. Adjust the Hybrid balance by switching capacitor
using S201 and S202 and adjusting R261 and R262
for a minimum level at J11, the Rx test point. (This
is an iterative process. The level should be -20 dB
from the CO Test Tone at this level.)
9. Remove the tone and speak over the telephone and
RF unit to ensure a clean and clear voice path.
NOTE: The mobile or portable must be keyed to trans-
mit every 1 or 2 minutes for a brief period (1 or 2 sec-
onds) to hold the connection.
Transmit
(Revision 203 or Later)
1. Set S5 for Test 9 (1-4 open, 2-3 closed).
2. Reset the module. Press and release S2.
3. Call a number to the DID. The DID answers and
places alignment tone on the line.
4. Adjust R83 for -3 dBm ±0.5 dB at TP3.
5. Adjust R44 to add 8 dB, ±1 dB to the CO Test Tone
level at J12. Verify that the level across the line is -
12 dB ±2 dB from the Test Tone level of the CO, use
a balanced non-grounded AC voltmeter.
6. Verify that the level at the telephone is clean and
clear. Remove or cover the mouthpiece.
7. Adjust the Hybrid balance by switching capacitor
using S201 and S202 and adjusting R261 and R262
for a minimum level at J11, the Rx test point. (This
is an iterative process. The level should be -20 dB
from the CO Test Tone at this level.)
8. Set S5 to 0 (close all sections) and reset the card for
normal operation.