Checking Industry-Standard Telephone Connections To The JM008 Module
When you connect industry-standard telephones to the JM008 expansion module, the maximum
distance allowed from the common equipment to the telephone is 1500 feet if you use #24 gauge
or larger, twisted pair cable.
Check the installation of industry-standard telephones for proper operation by performing the
following voltage measurements under the conditions listed:
– have both the common equipment and the stations connected to the station connector block,
– have bridging clips installed on the connector block,
– have the system powered and operational.
Measure DC voltage across the tip and ring pair of each installed industry-standard telephone
with a DC voltmeter. You should read: +24 volts DC +/- 2 volts.
Call each industry-standard telephone to stimulate the ring generator assembly, and measure the
AC ringing voltage across the tip and ring pair of each called telephone.
You should read: 55 volts AC +/- 5 volts.
If your measured voltages are different from the values shown herein, it could indicate a wiring
error or equipment problem.
IMI66–132
DSU II Digital Telephone System
2 – 46 Installing The DSU II Digital Telephone System
Summary of Contents for DSU II
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