ZETRON 2000 Series Specifications download pdf (Page 80)

Trunk Cards and Connections

80 025-9035AA

DTMF DIAL:

If DTMF dialing is needed on the trunk, wait about two seconds after the dial tone

goes away (meaning the outbound trunk has been seized), then dial.

RING BOX:

If you are connecting into a Zetron Ring Box, wait for the called device to answer

then DTMF dial as needed.

7. Your outbound call should complete. The called party must answer the telephone.

You can talk to the called party and explain that you are going to play a 1000 Hz

tone for trunk adjustment purposes. They must leave the telephone off-hook. Tell

them to be quiet while you are doing the adjustments - a lot of background noise on

the telephone will make it difficult to get a good adjustment.

8. Enter *. The 1000 Hz tone will play on the outbound trunk for up to 4 minutes.

9. When done adjusting the trunk you may hang up, or enter # to return to the same

beep that you heard after entering the 999 initially - you may then proceed to adjust

another outbound trunk.

Hybrid Adjustment

Following the call setup done above, perform the following procedure.

♦ Hybrid adjustment procedure

1. Attach a voltmeter to the FROM TEL and GND test pins on the front of the trunk

card. Set the meter to measure 2 VRMS or less. See Figure 13.

2. While the tone is playing (see Call Setup procedures on page 79):

Single Trunks & Dual trunk revisions A-E:

a. Adjust the “BAL C” for minimum reading on your meter.

b. Adjust the “BAL R” for minimum reading on your meter.

c. Repeat steps “a” and “b” until further adjustment makes little difference.

Dual Trunks revision F & up:

a. Install the shunt jumper in the KILL A1 to KILL A2 position for trunk A, or in

the KILL B1 to KILL B2 position for trunk B. This will help you find your

minimum reading. The KILL jumper must be removed after making the

adjustment. Do not install the KILL jumper until ready to adjust, as DTMF

decoding will probably not work with the jumper in.

b. Adjust the “BAL C” for minimum reading on your meter.

c. Adjust the “BAL R” for minimum reading on your meter.

d. Repeat steps b and c until further adjustment makes little difference.

e. Remove KILL jumper.

Note You are making the adjustment to get as little signal as possible

bleeding from the “TO TEL” back into the “FROM TEL”.

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ZETRON 2000 Series Specifications Page 80