Page 4.3
8 TRIBUTARY 75Ω DAISY CHAIN SWITCH 40-792
pickering
SECTION 4 - PROGRAMMING GUIDE
MODULE ARCHITECTURE 40-792
Three sub-units of 8 bits are used to control the module’s relays as shown in the table below. Enabling a particular
bit closes the C to A signal paths of the associated relays.
2 Form C Relay
Sub-Unit
Bit
Tributary
Selection
Daisy Chain
Relays
Rx Select Relays
Tx Select Relays
Loop-Back
Relays
1
1
1
RL1, RL2
-
-
-
2
2
RL3, RL4
-
-
-
3
3
RL7, RL8
-
-
-
4
4
RL9, RL10
-
-
-
5
5
RL13, RL14
-
-
-
6
6
RL15, RL16
-
-
-
7
7
RL19, RL20
-
-
-
8
8
RL21, RL22
-
-
-
2
1
1
-
RL52, RL53, RL56
RL60, RL61, RL64
-
2
2
-
RL52, RL53
RL60, RL61
-
3
3
-
RL52, RL53, RL54, RL56
RL60, RL61, RL62, RL64
-
4
4
-
RL52, RL53, RL54
RL60, RL61, RL62, RL64
-
5
5
-
RL53, RL54, RL55
RL61, RL62, RL63
-
6
6
-
RL53, RL54
RL61, RL62
-
7
7
-
RL53, RL55
RL61, RL63
-
8
8
-
RL53
RL61
-
3
1
1
-
-
-
RL5
2
2
-
-
-
RL6
3
3
-
-
-
RL11
4
4
-
-
-
RL12
5
5
-
-
-
RL17
6
6
-
-
-
RL18
7
7
-
-
-
RL23
8
8
-
-
-
RL24
The 40-792 utilises an array of thirty four 2 Form C changeover 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
architecture is shown in detail in Figure 2.2. 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
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