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Purpose:
To verify cable connections, the electrical interface driver, and the receiver's Integrated
Circuitry.
Equipment
Requirements:
One (1) Bit Error Rate Tester (BERT) Set with appropriate interface module.
One (1) DB25 to DB9 Serial Cable.
Procedure:
Set up the bench test as shown in Figure 17. Set front DIP switch #7 (LOCLB) to the
down (On) position. Set the BERT tester to DTE. Connect the DB25 to DB9 serial cable to the tester.
Connect the other end of serial cable "male" side to the DB9 "Female" port of the Stand Alone unit to be
tested. On rackmount units, when using the terminal block connector for RS-232, make the proper
connections according to the terminal block connections shown below as reference.
The "BRD" and "RSP" LEDs should be On indicating good signal is received by the TC3420 and transmitted
back to the tester. The BERT tester should indicate a "SYNC" signal. This test can be performed on each
Master or Slave units
Note:
It is normal for the LOCLB and ALARM LEDs to flash on the Master or Slave units since
the unit is in diagnostic mode.
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