Technical Manual

EX7100 Technical Manual – Monitoring and Diagnostics
©1999 Exicom Technologies (1996) Ltd 4-15 Issue 2 - August 2001
4.6 Bit Error Rate Testing
4.6.1 General
At some time after installation of the EX7100, the user may wish to perform a bit error rate
test in order to confirm that the system is operating correctly.
A BER test may be performed on both configurations of EX7100: 64kbps data or
telephone.
Testing of a telephone system is possible by performing the test at the 64kbps digital level
using the G.703 or Synchronous data interface.
There are a number of levels of BER testing that may be performed on the EX7100 to
enable the user to pin-point the location of a potential fault.
A) End-to-End one direction test: This requires a Bit Error Rate Tester (BERT) at both
ends of the link.
B) Full round-trip test: This may be performed using a single BERT (capable of sending
and receiving simultaneously) utilising the remote digital loopback feature of the
EX7100.
C) Local Interface test: As per B) above, but utilising the local loopback feature of the
local EX7100 terminal.
It should be noted that the results obtained from a round trip test will produce a BER twice
that of a single direction test.
Important Note:
During the BER test, the radio link will not be available to normal traffic.
Figure 4.5: End-to-End Bit Error Rate Test
Figure 4.6: Round-Trip Bit Error Rate Test
EX7100
EXICOM
o o
o o
o o
o
o
EX7100 EX7100
EXICOM
o o
o o
o o
o
o
EX7100
BERT BERT
Bit error rate
tester set to
transmit.
Bit error rate
tester set to
receive.
EX7100
EXICOM
o o
o o
o o
o
o
EX7100 EX7100
EXICOM
o o
o o
o o
o
o
EX7100
BERT
Bit error rate
tester set to
transmit and
receive.
EX7100 set for
remote loopback