Exalt EX-11s, Руководство по установке и управлению, Страница: 58 / 103

Exalt Installation and Management Guide
s-Series Digital Microwave Radios
50 201511
2008-02-27
Performance Page
This page provides statistical information about the performance of the system in relation to the
integrity of the user data and the RF link.
Figure 33 Performance page

The Current BER field indicates the current bit error rate of the link. If the link is operating
perfectly, this should indicate zero. Generally, the link should remain at a BER less than 1x10
-6
(1
bit out of every million bits errored). This is the threshold performance specification and the
standard to which the link was engineered. However, radio links can and are affected by weather,
interference, and other external sources and will occasionally have a higher error rate. A link
remains operational unless the BER exceeds 1x10
-3
(1 bit out of every hundred bits errored).
Consult the link design engineer for an understanding of the predicted error rate of the radio link
as it has been designed. Many applications are unaffected by bit errors, but TDM circuits (for
example, T1 or E1) are more sensitive. Also, if the link operator is providing a service guarantee,
this value may need to be monitored or examined in cases of service issues. The behavior of BER
in relation to other alarms or measurements and external events can be very helpful in
troubleshooting activities.

Current RSL is the measurement of the received signal level at the radio antenna port. This is the
measured level of the RF signal coming from the opposite end of the radio link. The link was
engineered to a specific RSL by the link design engineer, and this RSL should be obtained during
installation and remain relatively stable during the operation of the link. RSL can and will vary as
a result of weather changes and other external sources, such as path obstructions. Once again, this
variation was part of the original design to achieve a certain level of performance over time. Bit
errors occur when the RSL falls to a level within roughly 3dB of the threshold specification.
When the RSL falls below the threshold specification, the link disconnects and will not reconnect
until the RSL is above the threshold specification. The behavior of RSL in relation to other
alarms or measurements and external events can be very helpful in troubleshooting activities.