Operating Principles And Configuration; Synchronization-Basic Network; Extension Operation With Saf - Microwave Data Systems MDS TransNET 900 Installation & Operation Manual

9.0 OPERATING PRINCIPLES AND CONFIGURATION

9.1 Synchronization—Basic Network
Remotes acquire synchronization and configuration information via SYNC
messages.They can synchronize to the Master (the
valid Extension (a
The Master will always transmit
start sending
SYNC
Master.
The ability to synchronize to a given radio is further qualified by the sender's
Extended Address (
( , , and
XMAP XPRI
When a primary is specified (
find the primary first. If 30 seconds elapses and the primary is not found, then
the radio will attempt to synchronize with any non-primary radio in the
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
is less than
XRSSI
loss-of-synchronization, and hunt for the primary again (as described in the
previous paragraph).
By default, Extensions (and the Master) begin with
Synchronization qualifiers are set to
respectively. This default configuration allows any radio to hear the Master.
When an Extension is added, the extended address of the Extension 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 (
it in their list of valid synchronization sources (

9.2 Extension Operation with SAF

The Store-and-Forward (SAF) capability operates by dividing a network into
a vertical hierarchy of two or more sub-networks. (See
Adjacent sub-networks are connected via Extension radios operating in
" " which move data from one sub-network to the next one.
MODE X
The Store-and-Forward implementation adheres to the general polling
principles used in most multiple-address systems (MAS). Polls originate from
the Master station, broadcast to all radios within the network, and travel
hierarchically downward. All Remotes will hear the same message, but only
one Remote will respond. Messages within a hierarchy only travel in one
direction at a time.
Using SAF will cut the overall data throughput in half, however, multiple
networks can be inter-connected with no additional loss in network
throughput.
46 MDS TransNET 900 I&O Guide
unit).
MODE X
SYNC
messages after synchronization is achieved with its
) and by receiver's Synchronization Qualifiers
XADDR
).
XRSSI
is 0...31), a radio will always attempt to
XPRI
value is compared to the
RSSI
(or if is
XRSSI NONE
MODE M
messages. An Extension will only
) the radio will force a
XADDR
, , and
XMAP 0 XPRI 0
).
XMAP
MDS 05-2708A01, Rev. B
unit) or to any
XMAP
value. If
XRSSI RSSI
.
0
XRSSI NONE
), or by including
XPRI
Figure 6 on Page
,
5.)