EFJohnson 3000 SERIES - Manual (Page 128)

TELEPHONE INTERFACE MODULE (TIM)
14-18
call) and add in a 1 kHz tone at 2 kHz deviation
(3 kHz deviation total). Adjust the E&M transmit
level at TX+/TX- using R44 to the appropriate level
(normally -7 dB).
NOTE: If the 4-Wire circuit requires a different level,
adjust R44 to this level. If the circuit is a microwave
link and is terminated into the CO or PBX with a 2-
Wire to 4-Wire termset module, the output level of this
device should be -7 dBm at TIP and RING (a 1 kHz
tone modulated at 2 kHz should = -7 dB at Tip and
Ring).
Figure 14-16 TRANSMIT DIAGRAM
14.10.3 RECEIVER ALIGNMENT
Receiver Audio Level Adjust
Tuning the receive path requires a 1 kHz tone at -
7 dB be injected across Tip and Ring of the test phone
(remote phone used in the transmit procedure). If the
CO requires a level higher or lower for receive
average audio, adjust to this level (-7 dB is accepted
by 90% of COs).
Monitor the transmit frequency of the test
repeater and adjust R41 until 3 kHz of audio deviation
is transmitted (2 kHz audio + 1 kHz data =
3 kHz total deviation).
With the tone still injected at the remote phone
monitor RX+/RX- at J11 and record the level of audio
received. This value is used in the Receive DTMF
procedure that follows.
Receive DTMF Level Adjust
Inject DTMF across RX+/RX- (J11) at the level
recorded in the Receive Audio Level Adjust above.
On the E&M personality board monitor TP203 and
adjust R210 for -7 dB.
14.10.4 4-WIRE E&M DIAL TONE DETECTOR
RECEIVE ALIGNMENT
1. Disable Dial Tone Detection at the Call Processor.
Set the CO settle time to 750.
NOTE: This lengthens the time between going off-hook
and dialing the first digit. Allow enough time to mea-
sure the level and frequency at J11 in Step 2.
2. With the telephone test set connected to J11 place a
call. When dial tone is present measure and record
the level and frequency at J11. The level is ____
dBm and the frequency is _____ Hz.
3. Continue to measure at J11. Insert the generate
portion of the transmission test set into the EQU
jack (bottom) of J1.
4. Set the transmission test set to generate
the same frequency measured in Step 2.
5. Adjust the generator until J11 is the same level as
measured in Step 2.
6. Monitor J11, decrease the output of the transmission
test set until the level at J11 is 2 dB below the level
in Step 2.
7. Adjust R207 on the personality card for -6 dBm,
±
1
dB at TP202.
8. Adjust R247 for a peak AC voltage or dB level
reading at TP204.
9. Connect an oscilloscope or DC voltmeter to TP206.
Adjust R255 until TP206 is high, slowly adjust
R255 until TP206 just goes low.
10.Remove the test set from EQU jack.
11. Re-enable dial tone detection in the Call Processor.
Place a call to verify dial tone detection.
Figure 14-17 RECEIVE DIAGRAM