RoadRunner
U S E R S G U I D E
67
see if the connection drops. If it does not, this indicates that your local
loop is working properly. Try dialing a connection to another local
codec or a local loop-back number. If this works, your local switch is
working properly. If it fails, then the problem is on the outbound side
of your local switch. If this works, try dialing to a long distance loop-
back number. If this fails, the problem is most likely with your long-
distance provider. MUSICAM USA will provide you with a list of
long-distance loopback numbers, both domestic and international, upon
request.
Please note that in North America, you must specify a long-distance
carrier when ordering ISDN service. If you do not, you will not have
long distance service. You may also have to sign up directly with that
carrier to open an account.
Another thing to request from your service provider, and they may be
reluctant to do this, is a circuit trace. The central office switch makes a
record of all call transactions, including setup and termination requests,
and call setup errors. With this information, it may be possible to
isolate the cause of the trouble, or at least which end of the connection
is requesting the termination.
Connection Problems (Non-ISDN)
The
RoadRunner
can be used with non-ISDN transmission systems, such
as dedicated 56 kb/s or 64 kb/s lines, fractional T1 and satellite. When
using multiple lines to get higher transmission rates, it is imperative that
the lines be ordered and configured properly.
When ordering the lines, you should inform the service provider that all
lines will be used together to achieve a single, higher bit rate path. For
example you must tell the service provider that you will use two 64 kb/s
dedicated lines to achieve a 128 kb/s link. You must make sure that all
lines are in contiguous channels in the same di-group
at both ends
. If two-
wire circuits are available, get these instead of four-wire.
A di-group is a group of four consecutive channels that share the same
circuit card in the central office channel bank. Since they share the same
card, they share the same clock source. When using multiple line it is
important that all lines use the same clock, since any clock drift between
lines will cause problems with the
RoadRunner
. As an example, dedicated
lines 3 and 4 are contiguous and on the same di-group, but channels 4 and