Specifications

Monitoring Performance 6-1
Chapter 6
Troubleshooting and
Diagnostics
This chapter describes the FCD-E1LC diagnostic functions. The diagnostic
functions available on the FCD-E1LC include:
• Alarm and event collection – see
Section 6.3
• Collection of performance monitoring data – see
Section 6.1.
• Test and loopbacks for checking transmission paths – see
Section 6.4 .
These functions can be used to identify problems in the network incorporating
FCD-E1LC units, test the proper operation of each FCD-E1LC unit, and rapidly
locate the cause of the fault: within the FCD-E1LC itself, in its connections to the
network or to a user’s equipment unit, or in another network component.
In addition to the information listed above, you can find in
Section 6.4
troubleshooting instructions, including a list of the configuration (“sanity”) error
messages generated by the FCD-E1LC. This Section will help you solve problems
that prevent normal operation of the equipment.
If you need additional support for this product, see
Section 6.6 for technical
support information.
6.1 Monitoring Performance
The FCD-E1LC enables collecting transmission performance data for its main and
sublinks. The collected data enables the system administrator to monitor the
transmission performance, and thus the quality of service provided to users, for
statistical purposes.
In addition, when problems are reported by users served by FCD-E1LC, the
collected data can be used for diagnostic purposes, because it can help identify
the source of the problem.
This section describes the FCD-E1LC performance evaluation and monitoring
functions. the available performance monitoring parameters depend on the
configuration of the main and sublink:
• When the CRC-4 option is enabled, it is possible to monitor end-to-end the
data transmission performance. The error detection information is derived
from the data payload, by performing a cyclic redundancy check (CRC). The
resulting CRC checksum is transmitted in addition to the raw data bits. The
receiving end recalculates the checksum and compares the results with the