User Manual

VoiceXtender Modem Installer’s Guide
Installation and Setup
Rev. A - 8/97 3-9
For an intercom application (private line), connect only the phones to the
master and slave modems. When you pick up one phone, the modem
automatically rings the other phone (you will hear a clicking sound on your
phone that indicates that the other end is ringing).
Signal assignments for the RJ11 can be found in Appendix A, ”Specifications.”
Cabling a Hub Application
If you have a hub application where more than one pair of AirLink modems is
required, you must cable the co-located modems together with a coaxial cable so
that all the modems transmit and receive synchronously.
Cable the Burst Sync connector (labeled SYNC on the modem) of the
synchronizing modem to the Burst Sync port of the synchronized master modem
(see Figure 3-4). When connecting more than one synchronized master modem,
attach BNC “Tee” adapters to the Burst Sync connector of all but the last of the
downstream master modems. For most applications, up to 20 meters total of
cable can be used between AirLink modems and up to 16 master modems can be
connected.
NOTE Ensure that all cable connections are secure.
VoiceXtender modems can be burst synchronized with other VoiceXtender modems and
with model 64MP, 128 and 256 AirLink data modems. If VoiceXtender modems are burst
synchronized with AirLink data modems, one of the data modems must be configured as
the synchronizing unit.
Figure 3-4
Burst Synchronization Cabling