TELEPHONE INTERFACE MODULE (TIM)

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.

14.10.44-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 measure 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

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