COMMANDER
INSTALLATION AND USAGE TIPS
INSTALLATION AND USAGE TIPS
While the
TIELINE COMMANDER
is a very reliable telecom product, its performance will only be
as good as the line that it is operating over.
Proper precautions
MUST
be taken to ensure that only the COMMANDER
uses the line.
Remove these possible interference sources:
•
Other telephone handsets
•
Fax
machines
•
Computer
modems
•
Alarm
systems
•
Extension
bells
•
Line monitoring devices
Important precaution
for the COMMANDER phone-line:
ENSURE THAT CALL WAITING IS DISABLED!
It is always preferable to obtain a dedicated phone line from the local Exchange or Central Office.
Try to avoid going through a PBX, PABX, Key station or any other local exchange. If this is
unavoidable, check that the line works BEFORE you try to do a live program. Some of these
systems have poor line characteristics and may make the operation of the COMMANDER
marginal, if not unusable.
WARNING - DO NOT CONNECT YOUR TIELINE TO A DIGITAL PHONE SYSTEM AS
PERMANENT DAMAGE MAY OCCUR.
If you are unfamiliar with a particular facility, check that the line you are given is
NOT a digital
line
. This is very important. because If the unit becomes faulty due to the use of a digital phone
system, the
Warranty automatically becomes void.
On most good lines, the COMMANDER is normally able to achieve 28,800 bps (Bits Per Second)
at a line quality of approximately 70%. If you are not able to achieve this level of operation, you
may have transmission problems with your line or the line at the other end of the connection.
CHECK:
•
Length of the line from your site to the local Exchange or Central Office
•
Presence of stub or party lines on your local loop
•
Earth leakage problem on the line
•
Equipment problem at the Exchange or CO
It is very desirable to have a local loop (The line from your office or home to the local CO or
Exchange) as short as possible. Optimum performance can be expected for lines up to about
three kilometers in length.
In some countries, it has been the practice to have more than one phone service attached to one
line. As more lines have been installed, the services have been separated but the unused lines
have remained connected to the local loop. Even though the old line may be unused, if it is still
present across your local loop, it will cause problems with your equipment operation.
A good line should have an earth isolation of better than ten meg-ohms. If your line is located in
an area where water is a problem, check out the earth leakage.
Although there are many factors at the Telco end that can cause problems, a problem that does
occasionally occur is if the clock on the interface codec to your line is not synchronized to the
network. A drifting clock will cause instability and unreliable COMMANDER performance. If you
suspect that this could be the problem, contact your local Telco.