Liberty USERS GUIDE
4
Installation and Usage Tips
While the MUSICAM USA LIBERTY is a very reliable telecom product, its performance will only be as
good as the POTS line that it is operating over. Take precautions to remove these possible interference
sources:
•
Other telephone handsets
•
Fax machines
•
Computer modems
•
Alarm systems
•
Extension bells
•
Clandestine devices
Important precaution on the LIB ERTY Telco-line: ENSURE THAT CALL WAITING IS DISABLED!
It is preferable to obtain a dedicated phone line from the Telco without going through a PBX or PABX. 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 LIBERTY unstable.
WARNING: DO NOT CONNECT YOUR LIBERTY 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 becomes void.
On most good lines, the LIBERTY 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, try to connect at a lower bit
rate for 50% line quality
.
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 Central Office
It is desirable to have a local loop (The line from your office or home to the local Central Office or
Exchange.) as short as possible. Optimum performance can be expected for lines up to about two miles 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 may cause problems Selector 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 LIBERTY performance. If you suspect that this could be the problem
then contact your local Telco.
Summary of Contents for Liberty
Page 1: ...LIBERTYTM UsersGuide ...
