User Manual

VoiceXtender Modem Installer’s Guide
Installation and Setup
3-6 Rev. A - 8/97
Phone/Line Switch (SW2-1)
This switch sets the modem connection to the phone or the line. When the
modem is set for Phone, it provides a standard ring current to ring the phone.
(The current is sufficient to ring at least five phones.)
Master/Slave Switch (SW2-2)
This switch sets the modem to be a master unit or slave unit. One modem in the
pair must be the master and the other modem must be the slave. The master
modem transmits continuous bursts while the slave transmits only in response to
the master as long as the slave’s RTS is activated.
Sleep/Normal Mode Switch (SW2-3)
This switch sets the modem’s communication status. When set to Normal mode,
the modems can communicate and the green SYNC light will be illuminated.
When set to Sleep mode, the green SYNC light is off and the modems cannot
communicate until the switch is returned to the Normal (OFF) position.
Pseudo-Random Noise Sequence Switches (SW2-6 through SW2-8)
These switches set the pseudo-random noise (PN) sequence (1 through 8) for the
modem. This is the bit sequence that actually spreads the spectrum.
The modem pair (the master and slave) must be configured for the same PN
sequence. Different PN sequences are used to reduce inter-channel and co-
channel interference between modem pairs. All PN codes are equally effective.