Toshiba Strata AirLink Installation Manual page 105

Measure DC Resistance
1. Use a digital multimeter that has resistance measuring capability in ohms and a basic accuracy
of better than one percent.
2. Use an RJ-11 female-to-female line adapter.
3. Ensure that all permanent wiring is done and all primary protectors are installed, if required.
For information on primary protection requirements for UL1459 compliance in the United
States, see "Primary and Secondary Protectors"
4. Disconnect the RWIU from power.
5. Disconnect the cables from Base Station 1, 2, 3, and 4.
6. Disconnect the transmit and receive cables from the Base Station and connect them into each
end of the RJ-11 line adapter, creating a loop.
7. Set the multimeter to the ohms scale.
8. To check the distance to Base Station 1, connect the multimeter probes between pins 1 and 5 or
1 and 6, depending on the cable polarity.
9. Connect the probes between 2 and 5 or 2 and 6.
A reading should register at only one of the pairs and must be less than the values listed in
Note
Table 33.
Table 33 Cable DC Resistance
Input
Power
Line
Local
10. Repeat Steps 4~9
11. If the multimeter reports no reading or high resistance, check the readings again.
If the readings are correct after performing
reversed or shorted somewhere in the installation. If not, there are open connections
somewhere in the installation; check and correct all punch-down connections and repeat
4~9.
Strata AirLink Installation Guide
Wire
Gauge
22, 24, or mixed 22/24
22
24
to check all the Base Stations.
5/00
Maintenance and Troubleshooting
on Page 102.
Maximum DC Resistance
Allowed for 2,000 feet
98 ohms
66 ohms
104 ohms
Step 9, the transmit and receive pairs are probably
Troubleshooting
Steps
95