CANOGA PERKINS 2270 Fiber Optic Modem - Manual (Page 53)

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2270 Fiber Optic Modem
Chapter 5 - Troubleshooting
5.1 Diagnostic Procedures
The following procedures are intended for use in the event of a system failure, not during the initial
installation of a 2270 optical link. For initial installation checkout, refer to Chapters 1 and 2.
5.2 System Test
All 2270 Modems have built-in local loopback and system test features. These tests can be used
to verify the basic operation of a 2270 system. See Figure 5-1 for an illustration of system test
loopback.
NOTE: Interface control of the loopback tests is only supported on the following modular
interfaces: RS-423/RS-232C, RS-422, P53 and V.35.
The test modes can be activated by setting the Loop switch on the front panel or by turning on the
Local Loopback or Remote Loopback control leads in the electrical interface (supported interfaces
only).
NOTE: Test activation will disrupt normal data flow through the modems.
Figure 5-1.
System Test
Example From
User-End
of Fiber Link
All of the test options are summarized in Table 5-A and described in detail in the following sec-
tions.
The ALT A and B option jumpers allow the user to select several different "Local" and "Remote"
testing options. Front panel switch 8 (Alternate Loopback Functions) allows selection of various
combinations of Local and Remote Test options.