User's Manual

EX7100 Technical Manual – Monitoring and Diagnostics
©1999 Exicom Technologies (1996) Ltd 4-14 Issue 1 - February 2001
This feature allows a technician to distinguish whether a fault is within the radio
equipment, or on the external telephone line.
Enabling Analogue Loopbacks
1) From idle, press ‘Enter’
Use the arrow keys to enter the First Level
password ‘1111’ and then press ‘Enter’.
2) Use the up and down arrow keys to make
sure the →
→→
→ is next to Exchange/Subscriber
and then press ‘Enter’
3) Use the up and down arrow keys to make
sure the →
→→
→ is next to Loopback and then
press ‘Enter’.
4) Use the keypad to set the required
channel to the required loopback mode
and then press ‘Enter’ to accept.
5) Press ‘Escape’ until the display returns to
idle
Note: During loopback testing the channel is not available to user traffic. Ensure that the
loopback mode is disabled when testing is complete.
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.
Password ∗ ∗ 1 ∗
↑
Psu monitoring
→Subscriber
Loop current
→loopback
Ch: 1 off
↑