Download Multiserver 3000

Marathon 3K Voice/Fax Facility Manual
Voice/Fax Channel Level Adjustment Procedure
Adjust all Voice Ports (Channels) at One Location
If yours is a dual channel voice/fax facility, both voice channels may be
adjusted by a single technician and without going across the network. This is
accomplished by force connecting the two voice channels, or by placing a
switched call between them.
First, a signal from a fixed dBm source is applied in one direction through
the connected pair, with the voice channel nearest the signal source serving
as the sending channel, and the other voice channel serving as the receiving
channel. Adjustment involves setting the sending channel input level to a
Transmission Level Point (TLP) of a -4 dBm input level display, and the
receiving channel's output level to a reading of -8 dBm or lower at the
associated dB meter (see Figure B1).
Signal
Source
External
Telephone
Equipment
(PBX, PSTN)
0 dBm
?? dBm
Marathon 3K
No. 1
Marathon 3K
No. 2
Voice/Fax Channel
Voice/Fax Channel
Adjust
Input
Level
to –4 dBm
External
Telephone
Equipment
(PBX, PSTN)
Adjust
Output
Level
–8 to –16
dBm
dB Meter
Figure B-1. Basic Adjustment Objective
Next, the two voice channels remain connected as before, but the signal flow
is reversed. What was previously the receiving voice channel now becomes
the sending channel, and vice versa, and the adjustments are made in a
reverse order.
If yours is a single voice/fax channel facility, you must pair up this channel
with another, compatible voice channel across the network. In this case the
adjustment procedure requires two technicians, one at each location.
If your Marathon 3K includes, in addition to the builtin voice channels,
another voice/fax module configured for the same telephone interface, you
may copy the results into that channel.
B-2