Verilink AS56/56Plus (896-502588-001) Product Manual - Manual (Page 17)

Specifications
AS56 and AS56 Plus User Manual 1-5
event occurs, a description with a time and date stamp is immediately sent
out the printer port. In addition, the Access Sys tem56 maintains a log of
the most recent sixteen events and that log can be accessed by either the
front panel controls and LCD panel or an externally attached terminal.
Built-in Diagnostics
The Verilink Access Sys tem56 includes extensive capabilities to help
pinpoint network problems without the need for external test equipment.
Diagnostics include local and remote Serial Port digital loopbacks, LLB,
RLB and payload NI loopbacks.
The Access Syst em56 also includes a built-in bit error rate tester
(BERT), eliminating the need for external test equipment. The built-in
tester transmits a 2047-bit pseudo random test pattern. The Access
System 56 records errors received, seconds in test, and error-free seconds.
Alarm conditions are displayed on the front panel LCD screen as well as
on the console's Alarms/Statistics screen. Front panel LEDs indicate unit
and control signal status.
ESF Operation
The Access Syst em56 Extended SuperFrame (ESF) operation allows the
telephone company central office to continuously monitor the local loop,
to transmit and receive test messages, and to retrieve performance data,
without interrupting normal operations. The units are compatible with
both AT&T 54016 and ANSI T1.403 specifications.
Clear Channel
For T1/FT1 operation, the Access Syst em56 units provide clear channel
signaling with B8ZS line coding (in installations where it is supported by
the Telco central office) or alternate channel assignment.
Specifications
Product specifications for the Access S ystem56 are listed on the
following page.