Chapter 4 - Bench Tests; General; Signal Generator Test; Local Loopback Test - TC Communications TC8116 User Manual

8 or 16 channel async & sync fiber optic multiplexer

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Table Of Contents

Table of Contents

General

It is highly recommended to conduct bench tests before actual installation. Bench testing allows the user

to become familiar with all the functions and features of the TC8116 in a controlled environment. Knowledge

of these functions and features will ease installation and troubleshooting efforts later on.

Signal Generator Test

After System Start Up, you should conduct the following test to verify that the unit was not damaged during

transportation:

1. Use a short optic jumper cable to form a loop from optic "TxA" to "RxA." Once a valid optic signal is

received, the "SYNC," and "RxA" LEDs should light solidly and the Alarm LED should turn off.

2. Slide SW3 (SIG GEN) to the On (Right or Down) position to turn on each board's Signal Generator. The

channel "IN" and "OUT" LEDs should light in sequence on all channels. Note: the Signal Generator

function does not apply to Dry Contact Relay interfaces.

3. Disconnect the optic cable from "RxA." The corresponding channel "OUT" LEDs should be Off while

the "IN" LEDs continue cycling through.

4. You may connect the optic jumper cable to a second TC8116's optic "RxA" and observe the channel

"OUT" LEDs on the second unit lighting in the same sequence as the first unit's "IN" LEDs.

5. Upon completion of this test, return SW3 (SIG GEN) to the Off (Up or Right) position.

Local Loopback Test

With SW2 (LOCLB) in the On (Right or Down) position and a valid electrical signal is present at the RJ-

11, the incoming signal on pin 5 (or pins 2 & 5 for balanced signals) will be looped back to pin 4 (or pins 3

& 4 for balanced signals), and the "IN," and "OUT" LEDs will light solidly and the "LOCLB" LED will flash.

The loopback is formed inside the TC8116, after the input signal is converted to the TTL level. The purpose

of this test is to verify the interface's input and output connections, signal input receiver and signal output

driver.

Remote Loopback Test

Connect the fiber optic cables from the local TC8116 to the remote TC8116 unit as shown on the diagram

below. Apply a valid electrical signal at any of the RJ-11 connectors on the rear of the local unit. The "IN"

LED on the local unit should be lit and the "OUT" LED on the remote unit should be lit on the corresponding

channel connected to.

Enable SW1 (RMTLB) to the "On" (Right or Down) position on the remote unit, the optic signal received

at "RxA" or "RxB" will be looped back to the transmitter ("TxA" or "TxB"). Both "IN" and "OUT" LEDs will

be solidly lit on both the local and remote units on the corresponding channel connected to. The "RMTLB"

LED on the remote unit will be flashing. This test will verify the optic transmitters, receivers and the optical

link between units.

Local

TC8116