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2-2
If the DeskTop T1 DSU does not check out properly, replace it with a
spare, if available, and repeat the test. Do not attempt to repair the
DeskTop T1 DSU. For assistance, contact General DataComm Service
as described in the Preface.
If the DeskTop T1 DSU passes the test but subsequently fails to
perform in data communications operation, it may not be at fault; some
error may have been made in the installation or option selection, or
there may be other faulty devices or connections. Recheck the
connections and option selections, and if necessary perform the Fault
Isolation Procedure in Chapter 4 to isolate the fault. Also verify that
the customer equipment and remote DSU are compatible (that is,
operating at the same rate).
Option Selection
The DeskTop T1 DSU provides a number of field-selectable options
by which you can adapt it to a variety of configurations. The most
convenient way to set options is to use the VT100-compatible terminal
interface. Directions for connecting to the back panel Console port
appear in this chapter; directions for using the terminal interface
appear in Chapter 3, Operation.
You can also make option selections by positioning switches on the
DSU pc card. Figure 2-1 illustrates the locations of the option
switchbanks. The options are described in Tables 2-1, 2-2, 2-3, 2-4,
and 2-5.
a. If the Auto Framing option is to be used, enable it at only
one of the two DSUs that make up a link.
b. If you connect two DSUs back-to-back (direct cable
connection) and automatic Line Build-Out is to be used,
enable it in only one of the DSUs.
Timing Options
Timing options determine the clock source for the data the DeskTop
T1 DSU transmits to the network and receives from the customer
channel equipment. The default timing option for the DSU is Receive
timing, in which the network provides the timing source.
GDC 048R154-000
Installation
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