MDS TransNET 900 Specifications download pdf (Page 64)

54 MDS TransNET Ref. Manual MDS 05-2708A01, Rev. E

1. Mode X and M Radios—Can have direct reports (Mode R radios) out-

side of the chain.

2. Data (Payload)—Travels from Master to Remote, and back from

Remote to Master.

3. Mode X and R Radios—Extension links can be protected by mapping

one or more fall-back paths in case of a failure. Add secondary exten-

sion addresses (XADDR) into the

XMAP table. (See “XMAP

[00000000-FFFFFFFF]” on Page 44.)

For example, as shown in Figure 19, Remote “D” could use Remote “C”

as its extension primary, and Remote “B” (X ADDR = 1) as an alterna-

tive in case of a failure of Remote “C” (X ADDR = 2). This arrange-

ment assumes a serviceable path between Remotes “D” and “B”, and

requires Remote “D” to be programmed with XMAP = 2 to correspond

with the XADDR address of Remote “B.”

Invisible place holder

Figure 19. SAF Configuration Example

This configuration is easily arranged through the use of the Extension

Map

in the MDS TransNET Configuration Software’s “Store-and-For-

ward Settings.”

9.2 Synchronizing Network Units

The Master controls the synchronization for a given network for all modes.

Setting the Master to

SAF ON broadcasts a command from the Master to all

radio units in the associated network either directly or through an Extension

radio. This command puts all radios in the entire system in a special

time-division duplexing mode that alternates between two timeslots. One

time slot for data communications upstream and the second for downstream

communications.

The Extensions are single radios which serve as bridges between adjacent

sub-network levels. Extensions will undertake a “Remote personality” in one

timeslot, and a “Master personality” in the alternate timeslot and provide

communications with associated Remotes downstream. Extensions behave

like two radios with their data ports tied together, first synchronizing with

their upstream Master during their Remote personality period, and then

providing synchronization signals to dependent Remotes downstream during

its Master personality period.

A B C D E

MODE = M

ADDR = 1234

X ADDR = Ø

X PRI = None

MODE = X

ADDR = 1234

X ADDR = 1

X PRI = Ø

MODE = X

ADDR = 1234

X ADDR = 2

X PRI = 1

MODE = X

ADDR = 1234

X ADDR = 3

X PRI = 2

XMAP = 2

MODE = R

ADDR = 1234

X ADDR = 4

X PRI = 3

TransNET

Radios:

Radio

Confguration:

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MDS TransNET 900 Specifications Page 64

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