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1260-X138 User Manual
Installation Instructions 2-8
Racal Instruments
©
2005
Configuration
Relays
Multiplexers Groups 0, 1, 2, 3, 4, 5, 6, and 7 can be configured to
form a 1x64 2-wire mode multiplexer.
Group 0 common input can be connected to Group 1 common input
via relay K2. All other groups common input connections are shown
in Table 2-2.
Table 2-4 1x8 MUX Group Configuration Relays
From Group Common
Input
To Group Common
Input
Configuration Relay
Designator
0 1 K1
1 2 K2
2 3 K3
3 4
K79
4 5
K80
5 6
K81
6 7
K113
For a block diagram of the entire 1260-X138, refer to
Figure 2-2 and
Figure 2-3
.
Discharge Relays
There are eight discharge relays in the system. They are K4, K5,
K6, K82, K83, K84, K114, and K115. When closed individually, they
are used to discharge any residual charge build-up for the each
individual relay group via 91K
Ω
resistors.
Analog Bus
Relays
For even greater flexibility, Model 1260-X138 takes full advantage
of the analog bus found in the 1260-100X X-Series Adapt-a-Switch
Carrier Switching System. Four analog bus relays, K109, K110,
K111, and K112 in Figure 2-3 connect the output of multiplexers
Group 2, Group 5, Group 6, and Group 7, respectively to analog
bus pairs ABUS0, ABUS1, ABUS2, and ABUS3, respectively. For
details on using the analog bus, refer to the section “Creating Very
Large Multiplexers with the Analog Bus” in Chapter 3.