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8/16 TRIBUTARY DAISY CHAIN SWITCH, BALANCED 40-795/796
pickering
SECTION 4 - PROGRAMMING GUIDE
MODULE ARCHITECTURE 40-795/796
2 Form C Relay
Both module types use 2 Form C changeover relays. The 40-795 utilises an effective array of 64 relays and the
40-796 an effective array of 126 relays. In the default state the daisy chain is routed through all tributaries and
the multiplexers are inactive. Energising a particular relay creates a signal path between its C and A terminals the
effects of which vary depending on the relays function. The relay module’s switching architectures are shown in
detail in Figures 2.2 and 2.3. The architecture of an individual 2 Form C relay is as shown below:
B2
C2
A2
B1
C1
A1
Normally closed
Connection
Normally Open
Connection
Normally closed
Connection
Normally Open
Connection
Common
Connections
Definitions
A multiplexer (MUX) sub-unit may only have 1 bit selected, setting a bit will clear a previously set bit.
A multi-way multiplexer (MUXM) sub-unit may have any number of bits concurrently selected.
Sub-Units
The 40-795/796 modules have 5 sub-units as follows:
Sub-Unit
40-795
40-796
Purpose
1
8 way MUXM
16 way MUXM
Rx Route
2
8 way MUXM
16 way MUXM
Tx Route
3
8 way MUX
16 way MUX
Rx MUX select
4
8 way MUX
16 way MUX
Tx MUX select
5
8 way MUXM
16 way MUXM
Rx/Tx link
Each bit in a sub-unit corresponds to a channel, i.e. bit 1 controls channel 1 etc.
Figure 4.1 - Sub-Units 1, 2 and 5 on a Single Channel of the 40-795/796
Rx MUX
Tx MUX
Rx
Tx
In
Out
Sub-Unit 1
Sub-Unit 2
Sub-Unit 5
Operation
Sub-units 1, 2, and 5 work together to allow routing of the signals in a number of ways.
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