2.3.1 Loopback Points
A DEC MicroServer synchronous link has a number of components, as
Figure 2–4 shows. The communication connections between different DEC
MicroServer components are used as loopback points.
Figure 2–4 Parts of a Synchronous Communications Link
LKG−4912−93R
cable
Modem
cable
Adapter
DEC MicroServer
Communications
link
Loopback
points
Modem
Loopback connectors can be attached to any of the following loopback points:
•
To the socket on the DEC MicroServer
•
At the end of the adapter cable
•
At the end of the modem cable (if any)
Some modems provide loopback functions at the following loopback points:
•
On the communications link side of the modem
•
At the remote modem
By doing a series of tests, each using a different loopback point, you can find
out which part of the line is faulty.
Using Loopback Tests 2–11
