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RCS20 M:N Redundancy Switch
Remote Operations
contention on the bus. The "BROADCAST" ID, on the other hand, is accepted by all equipment,
but none of them returns a response packet to the remote M&C.
The following multi-drop override IDs are device-type specific, with the exception of
"BROADCAST". These are summarized in Table A-4 below with ID values expressed in decimal
notation:
DIRECTLY-ADDRESSED EQUIPMENT
Broadcast (all directly-linked devices)
DMD-3000/4000, 4500 or 5000 Mod Section, DMD15
DMD-3000/4000, 4500 or 5000 Demod Section, DMD15
RCU-340 1:1 Switch
RCS-780 1:N Switch
RMUX-340 Cross-Connect Multiplexer
CDS-780 Clock Distribution System
SOM-340 Second Order Multiplexer
DMD-4500/5000 Modulator Section
DMD-4500/5000 Demodulator Section
RCU-5000 M:N Switch
DMD15 Modulator
DMD15 Demodulator
DMD15 Modem
DVB3000/DVB3030/DM45 Video Modulator
RCS20 M: N Switch
RCS10 M: N Switch
RCS11 1:1 Switch
DMD2401/VHS-101/VME2401 Modem
Reserved for future equipment types
Multi-drop override IDs 01 or 02 can be used interchangeably to broadcast
a message to a DMD-3000/4000 Modem, DMD-4500/5000, or a DMD20
Modem. Comtech EF Data recommends that the multi-drop override IDs
be issued only during system configuration as a bus test tool by
experienced programmers, and that they not be included in run-time
software. It is also advantageous to consider the use of multiple bus
systems where warranted by a moderate to large equipment complement.
Therefore, if an RCS20 switch is queried for its equipment type identifier, it
will return a "24."
A.1.6 Software Compatibility
The COMMSPEC, operating in conjunction within the RLLP shell, provides for full forward and
backward software compatibility independent of the software version in use. New features are
appended to the end of the DATA field without OPCODE changes. Older software simply
discards the data as extraneous information without functional impairment for backward
compatibility.
Table A-4. Broadcast lDs
A–7
Rev. 14
MN-RCS20
MULTI-DROP
OVERRIDE ID
00
01
02
03
04
05
06
07
08
09
10
20
21
22
23
24
25
26
27
28-31
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