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RTU-292 Operations Manual
Table 2-2 Recommended Phone Line Settings
Type of System Send & Receive Levels
Dial-Up lines in a U.S. Domestic phone system -9 dBm
Dial-Up lines in most non-U.S. telephone systems -9 dBm
PBX Systems -12 dBm
Field Wire not connected to a telephone network -6 dBm
When using the RTU-292 in a domestic U.S. dial-up telephone network, the MAXIMUM level
allowed into a telephone line at the subscriber end is -9 dBm. Putting more level into the line
than this will NOT increase performance, but will result in distortion, crosstalk into other
circuits and the telephone company may disconnect the call. When operating into a PBX
system, the level should be set at -12 dBm. Higher levels than these may be only used into
field wire or dedicated or private lines, which are KNOWN to accommodate higher levels.
The send and receive levels are set by SW2-1, 2,3 as follows:
Factory default settings are indicated by an asterisk *
Table 2-3 Telephone Send/Receive Levels
SW2-1 SW2-2 SW2-3 Level
Off Off Off O dBm
On Off Off -3 dBm
Off On Off -6 dBm
On On Off -9 dBm *
Off Off On -12 dBm
On Off On -15 dBm
Off On On -18 dBm
On On On -21 dBm
JPS Communications, Inc.
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