Harris Constellation - Tributary BER Test; Figure 5-10: BER Testing of a 3 Xds3 System with Add-Drop Configuration

Harris Corporation Constellation™
Loopback Testing 5-11
LOOPBACK TESTING
Tributary BER Test
From the Keypad
PERFORMANCE > TRIBUTARY BER
This command causes the far end to give a loopback to the near end. The near
end inserts an on-board pseudorandom generator on the transmitter side of the
DS1 circuit. A detector on the receiver side of the DS1 circuit gives you the BER
and also tells you how long the test has been running.
Figure 5-10 shows a BER testing of a 3xDS3 system with an add-drop
configuration.
Figure 5-10: BER testing of a 3xDS3 system with add-drop
configuration
Tra n s mi t t er
Assembly
HLM-
3xDS3
Hi Cap
Modem
ACU
Receiver
Assembly
BER results from
the Keypad
Tra n s mi t te r
Assembly
HLM-
3xDS3
Hi Cap
Modem
ACU
Receiver
Assembly
Local Terminal
Remote Terminal
M12
Unit n
M12
Unit n
Notes:
Terminating M12 Unit is not necessarily the next
site in the system.
Only one DS1/M12 can be tested at one time.
M12 Unit n, where n = 1 ... 7.