2–20
DECbridge 500/600 Problem Solving
To install the FDDI loopback connector(s):
1. Disconnect the FDDI cable(s) from the FI module.
2. Install the appropriate loopback connector(s) for that model:
–
For multimode interfaces, install the multimode loopback connector(s)
(P/N 12–32005–01).
–
For single-mode interfaces, install the single-mode loopback
connector(s) (P/N 12–34830–01).
NOTE
If a loopback connector is not installed and the Enable
External Loopback switch is ON, self-test will fail.
2.4.6.3
Installing the NI Loopback Connector(s)
DECbridge 500 series units have a single switch-selectable AUI/ThinWire interface.
DECbridge 600 series units have three separate AUI interfaces.
To install the NI loopback connector(s):
1. Disconnect the interface cable(s) from the NI or NI(3) module.
2. Install the appropriate loopback connector(s) for that model, as shown in
Figure 2–6:
–
For AUI interfaces, install the AUI loopback connector
(P/N 12–22196–01).
–
For a ThinWire interface, install the T-connector (P/N 12-25869-01) and
terminator (P/N 12-26318-01).
3. On DECbridge 500 series units, verify that the AUI/ThinWire switch (config-
uration switch 8) is in the correct position: ON (down) for testing the AUI
interface and OFF (up) for testing the ThinWire interface.
