Clear-Com PL-PRO EF-1M, Инструкция по эксплуатации

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E F - 1 M I N T E R F A C E 5 - 5
NULLING TROUBLESHOOTING TIPS
Symptom Cause Solution
No audio; green LED is
off. EF-1M is not receiving power. EF-1M units at both ends of the connection
must receive power from a local PL system.
Unsatisfactory null. 1. Unstable PL system due to excessive
cabling, a high number of stations,
transformers connected across the
intercom channel, or other PL
equipment issues such as termination.
2. Too many EF-1M units on channel.
1. Verify operational status of PL
equipment.
2. Remove EF-1M units from the network.
If nulls on the remaining units improve, the
problem was too many EF-1M units. This
should not occur until approximately seven
or more units are sharing a channel.
However, as systems vary in size and
complexity, a user could experience
difficulty nulling as few as two EF-1M
units, each connected to a very large system.