ZETRON 2000 Series Specifications download pdf (Page 78)

Trunk Cards and Connections

78 025-9035AA

noise/static between words and when talker obviously paused) then turn the pot

counterclockwise.

♦ Factory adjustment for From Tel

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

card. For dual trunks, be sure to attach to the A or B test points for the correct side

of the dual trunk. Set the meter to measure AC volts RMS.

2. Have an assistant call into the paging system using a touch tone telephone. Call

any tone and voice pager programmed in the database. It should have a long voice

time so you have time to make the adjustment. Make sure you have called into the

line you are adjusting. Call in on the real telephone line - do not just stick a butt set

across the line.

3. Hold down one of the touch tone keys on the telephone.

4. Set the level appropriate for your revision of card, as follows:

Please note that you are positioning the knee of the AGC circuit for optimum operation.

Hybrid Adjustment

BAL R and BAL C adjust the full duplex hybrid balance for the particular telephone line.

Some adjustment is often required to compensate for the particular telephone line and

routing to the telco office.

If you swap telephone lines around, or the telco changes your lines, you should perform

this adjustment again.

The hybrid isolates what the Zetron trunk card puts onto the telco line from what it

receives from the telco line, separating the two paths: inward and outward.

Trunks Covered Settings

Single Trunks & Dual

Trunks revs. A-C

Set the meter range for 1 to 2 Vac

Adjust FROM TEL for 0.75 Vrms +/- 0.25 V (0dBm)

If you are using the trunk for alpha communications via a dialup

modem, use a slightly higher level of 1.0 Vrms ±0.25 V for more

reliable modem connections.

Dual Trunks

revs. D & E

Do not adjust. Factory adjustment only.

If you change the level in error, put it back to the approximate factory

setting by: turning it all the way counter-clockwise until it clicks,

then turning it six full turns clockwise.

Dual Trunks

revs. F & up

• Install the shunt jumper (see page 81) in the KILL A or KILL B

position while adjusting. Do not install the KILL jumper until

ready to adjust, as DTMF decoding will probably not work with

the jumper in.

• Set the meter range for 3 to 5 Vac. Adjust FROM TEL for

2.5 Vrms ±0.25 V (12dBm).

• Remove KILL jumper.

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ZETRON 2000 Series Specifications Page 78

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