CTI Products MCN RCD System Planner - Manual (Page 40)

Appendix C System Examples
Page 36 MCN Comparator Display System Planner
7.3 Example 3 - Extended Distance Spectra-TAC or Ericsson
Comparator Connected to a Console -- 16 Receivers
A multiple comparator system is shown in Figure 17. This system implements monitoring and control
of 3 different comparators from one console.
This system assumes the following:
•
Spectra-TAC or Ericsson / GE Comparator, 16 Receivers maximum
•
Console Display
•
CIBs will be rack mounted
•
IIBs will be rack mounted
•
400 feet between comparators and console electronics
•
Punch blocks are used for connection to comparators and to the consoles (Note that the punch
blocks are not shown on the diagram.)
Why in the world would we use an MCN system to connect the comparators to the console electronics?
Can’t they be connected directly? Normally, they can. In this case, the console electronics enclosure is
located 400 feet from the comparators. For the logic signals involved, there is a typical limit of about
200 cable feet between the comparator and the console electronics. We are using the MCN system as
wire extenders to get rid of the 200 ft limitation. Only a single network cable for the MCN system has
to be run the 400 ft. The MCN system can function to 4000 feet. If more than 4000 feet are required,
CTI Products can furnish MCN EXB System extender Modules which can extend the network over
telephone lines.
Notice that in this system, one CIB module is being used to control receivers from two comparators
(comparators 1 and 2). The only requirement for this setup is that both comparators 1 and 2 are the
same type (in this case they are both Spectra TAC or both Ericsson / GE). Comparator 3 does not have
to be the same type as comparators 1 and 2 since it connects to a different CIB. We are using punch
blocks in this system so we can easily connect comparators 1 and 2 to CIB module 1.
CA-80020-100
2
COMPARATORS
CIB
CIB
IIB
IIB
CONSOLE
ELECTRONICS
1
3
T
P/S
IN
OUT
IN
OUT
T
IN
IN
OUT
OUT
400'
P/S
CONSOLE
Figure 16 - 16 Receivers with Console Display
(P/S = Power Supply, T = Network Terminator)