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4.3.5.2 Diagnostic Tests Using LOOPBACK Connectors -
The following proce-
dure applies equally to the MUXserver 100 and the DECmux II. Each involve
running the TEST command as in Section 4 . . 3.5.1 (Diagnostic Tests with the
Composite Link Installed).
The procedure is as follows.
1.
For RS-232 composite links.
Place a loopback connector (Part
HH325)
on the suspect composite
port replacing the BC22F cable connection. Run the 'Composite Port
External test' as discussed in Section 4.3.5.1.
2.
For RS-422 composite links on the MUXserver 100.
Using the Test cable, Part No. 70-22411-01 (see Chapter 1, Section
1.11 of the MUXserver 100 Network Installation Guide for pin con-
nection details), connect Port A to Port
B.
Using the 'SYSTEM' com-
mand, configure both Ports A and
B
as RS-422 with equal speed
settings. Similarly, configure the DIP switches for RS-422 (see
Chapter 2, Section 2.5, SETTING UP THE COMPOSITE LINK
PARAMETERS). Run the 'Composite Port External test' as dis-
cussed in Section 4.3.5.1.
NOTE
Be sure to select both ports A and B in response to the displayed
prompt, (that is, respond with <
RETURN
>,).
3.
For RS-422 composite links on the DECmux II unit.
Using the Test cable, Part No 70-20984-01 (see Chapter 1, Section
1.11 of the MUXserver 100 Network Installation Guide for pin con-
nection details), connect Port A to Port B. Configure both ports and
run the 'Composite Port External Test' as discussed in 2 above.
26
CHAPTER 4 MUXserver 100 TROUBLESHOOTING
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