Telos Zephyr User Manual page 189

The Tone Commander NT1 usually provided by Telos has four LEDs, as follows:
•
Power. Should be lit. Normally, power for the NT1 is provided by the Zephyr over
the 8- pin S interface cable. Make sure this cable is installed to the proper
connectors. If this blinks then NT1 power is below the required level.
•
Active. Lights green when all is well.
•
Terminal Error. Lights red to indicate a problem on the terminal (Zephyr) side.
Usually means a hardware problem with the Zephyr, but could be a cable or NT1
problem.
•
Line Error. Lights red to indicate a problem with the Telco line. This means a
very basic kind of problem – usually no physical connection.
•
Yes, you can use a analog phone or butt set to do a basic check:
•
You will hear a clicking" sound when a line is connected. If you rapidly go
off and on hook you will hear a burst of white noise ("rushing" sound) for a
few seconds. If so, you are probably physically connected and the problem
is the configuration or NT1.
•
Combinations of lights and blinking allow a fine degree of explanation, see the NT1
manual for complete information.
Intermittent ISDN Problems
These are among the most difficult kinds of problems to solve. Rest assured, however,
that we've yet to lose one! This section addresses problems where the NT1 light(s) are
acting normally.
The most important tool is the Zephyr's integrated ISDN analyzer. This enables
you to look at the transactions between the Telco line and the Zephyr, so that a
judgment can be made as to whether the problem lies within the Zephyr or with the
telephone service.
The usual cause is a Telco problem, like mis- programming or an intermittent
connection.
If you are convinced that the problem lies with the ISDN line, you may be able to
convince the Telco to have an engineer look at the line with an analyzer. This works
much like the Zephyr's internal analyzer, but with more detail, and in a format which is
more readily understandable by telephone people. This procedure may sometimes be
the only way to get attention to a line problem. It's less hard to deny evidence provided
by their own gear.
Problems which happen at a certain time of day, or a certain day of the week could be
related to diagnostic routines the Telco may run periodically.
In rare cases, there could be a software bug in the Zephyr which reacts badly to
something coming from the ISDN line. Telos customer support will communicate the
problem to our engineering guys for resolution once it has been verified.
Section 10 ADVANCED PROBLEM SOLVING
189