User's Manual

05-3946A01, Rev. C TransNET OEM Integration Guide 19
When a primary is specified (XPRI is 0...31), a radio will always attempt to
find the primary first. If 30 seconds elapses and the primary is not found, then
the radio attempts to synchronize with any non-primary radio in the
XMAP
list.
Once every 30 minutes, if a primary is defined, the radio will check its
synchronization source. If the radio is synchronized to a unit other than the
primary, then the current
RSSI value is compared to the XRSSI value. If RSSI
is less than
XRSSI (or if XRSSI is NONE) the radio will force a
loss-of-synchronization, and hunt for the primary again (as described in the
previous paragraph).
By default, Extensions (and the Master) begin with
XADDR 0. Synchroniza-
tion qualifiers are set to
XMAP 0, XPRI 0, and XRSSI NONE, respectively. This
default configuration allows any radio to hear the Master. When an Extension
is added, the extended address of the Extension radio must be set to a unique
value. All Remotes that need to hear that extension can specify this either by
designating the extension as the primary (
XPRI), or by including it in their list
of valid synchronization sources (XMAP).
6.2 Establishing a Tail-End Link
A tail-end link can be used to bring an outlying remote site into the rest of an
MAS network. Figure 4 on Page 5 shows a diagram of this type of system.
A tail-end link is established by connecting an OEM transceiver
“back-to-back” with another unit such as a licensed MDS x710 Series trans-
ceiver. The wiring connections between the two radios must be made as
shown in Figure 11. In addition, the
DEVICE CTS KEY command must be
asserted at the OEM radio.

Figure 11. Data Crossover Cable for Tail-End Links
If required.
RXD
TXD
GND
RTS
3
2
7
4
DCE
DB-25
MDS x710 Series
Remote Transceiver
(or device requiring keyline)
TXD
RXD
GND
CTS
10
14
5
DCE
16-pin header (J3)
TransNET OEM
Remote Transceiver
(DEVICE CTS KEY)
16