E.F. Johnson Company 3000 SERIES, Руководство по установке и настройке

Страница: 123 / 214

TELEPHONE INTERFACE MODULE (TIM)
14-13
g. Adjust R293 until U204, pin 14 is high (> 4V).
h. Adjust R293 until U204, pin 14 just goes low
(< 0.8V).
i. Remove 700 Hz.
10.DTMF Output Level
a. Jumper T201, pin 8 to T202, pin 12.
b. Set S5 for Test 3 (sections 1-2 open; close 3-4).
c. Reset the module, Press S2 and release.
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
µ
F cap is -16 dBm
±
2 dB,
measure with a balanced non-grounded AC
voltmeter.
5. Set S5 for normal operation (all closed).
6. Reset the module, Press S2 and release.
14.7 2-WAY TIM ALIGNMENT PROCEDURES
(-670)
Contact the Telephone Company and obtain the
Test Tone and Silent telephone numbers. The levels
provided by the telephone company may be at
different levels than stated in this procedure. Typically,
the Central Office (CO) provides a Test tone at 0 dBm
which represents a Maximum Level. There is a possi-
bility that the level provided is an Average Level
(-12 dBm), the Voice Level can be above and below
the Average Level. Some COs or PBXs use different
Maximum Levels.
The alignment tone in the Switch is -12 dB rela-
tive to maximum audio level within the Switch. This
procedure is used to set the transmit level at a level
that is -12 dB relative to the maximum audio level of
the telephone line. Dial Tone is typically provided at
about 1 dB above Average Voice. Some adjustments
may be necessary to or from the phone line to allow
for acceptable audio levels.
NOTE: Determine the Maximum Level being used by
the CO or the equipment being connected to for proper
alignment.
14.7.1 MAIN RECEIVE
1. Put the card under test into the extension card.
2. Insert the lineman's set into the MON (top) jack of
J1 and dial the Test Tone. Verify that Test Tone is
heard.
3. Set S5 for Test 7 (sections 1, 2, 3 open, close 4).
4. Reset the module, Press S2 and release.
5. Remove the lineman's set.
6. Insert a Transmission Test Set in the MON jack of
J1 and record the level. The level is ___ dBm. This
is the line loss from the CO (assuming 0 dBm is
being sent by the CO).
7. Record the level at J201, pins 1 and 3 (see Figure 14-
19). The level is _____ dBm.
8. Connect the Transmission Test Set or AC voltmeter
to J11, adjust R41 for 0 dBm.
9. Verify 0 dBm,
±
1 dBm at TP5.
10.Adjust R214 on the personality card for
0 dBm,
±
1 dB at EP223 (assuming the DTMF level
was -10 to -13 dB).
11. Adjust R210 on the personality card for
0 dBm,
±
1 dB at EP222.
14.7.2 DIAL TONE DETECTOR
1. Connect the meter to J11, momentarily remove the
card from the slot and reinstall. This resets the card
so the level and frequency of the dial tone can be
measured.
2. Measure and record level and frequency at J11. The
level is _____ dBm and frequency is _________Hz.
The frequency should be recorded only if it is
different than the standard 350-440 Hz dial tone.
3. Continue to measure at J11. Insert the generate
portion of the Transmission Test Set into the EQU
jack (bottom) of J1.