ACS-160 Series & STL-160 Series T1 Multiplexer Installation & Operation 3 – Installation & Wiring
Version 2.11, August 2011
3-20 Harris Corporation
Intraplex Products
Warning! Use Table 3-17 as a rough guide only; channel modules actually draw varying amounts of
current from each of several different voltages in the multiplexer. When you add modules
to a multiplexer and the nominal power requirement exceeds 35 watts for a 50-watt unit,
30 watts for a 60-watt unit, or 95 watts for a 100-watt unit, call the Harris Customer
Service to determine whether the configuration may in fact overload the power supply.
Remember to include the CM-5RB common modules and their module adapters at 3.6 watts for each
set of common module and module adapter, with one set in a terminal multiplexer, and two in a dual
terminal or drop and insert multiplexer. Redundant CM-5RB modules must also be included in
calculating total power consumption. For example, a drop and insert multiplexer with a 50-watt power
supply and full common module redundancy has 37.6 watts available for channel modules on its main
shelf (50 watts minus 12.4 watts for four CM-5RB modules and 2 module adapters). A 60-watt power
supply provides 47.6 watts for channel modules, and a 95-watt power supply has 82.6 watts for
channel modules.
3.6.7 Power Application
After all equipment has been installed and wired, perform these steps to apply power to each shelf:
1. Verify that all modules (common, channel, and power) are seated snugly.
2. If the shelf is AC-powered, plug in the AC line cord. If the ACS-OPT1 dual AC power feed option is
installed, plug in both AC line cords.
3. If the shelf is DC-powered, insert the external power fuse.
4. Verify that the POWER indicator light is on and the POWER FAIL indicator light is off. In a 3RU
shelf, both the MAIN POWER FAIL and REDUNDANT POWER FAIL indicator lights should be off.
Ignore all other lights on the shelf for now.
• If no lights for any power supply are on, one of these scenarios has occurred:
◦ Both power modules have failed.
◦ Fuses on both power supply circuit boards have blown.
◦ Most likely, power has not been wired to the shelf.
• If the POWER lights turn on, but the POWER FAIL light for one power supply is on as well, that
power module is not functioning or there is a blown fuse on its printed circuit board. Test for
correct voltages.
5. Observe that each CM-5RB module displays its current mode setting for several seconds after
power is first applied. In a terminal multiplexer (ACS-163, ACS-166, or ACS-167), the display
should read TERM; in a drop and insert multiplexer (ACS-165 or ACS-168), the module in slot 1
should display DI-A, and the module in slot 2 should display DI-B. Redundant CM-5RB modules
always display BKUP during power up. (Section 3.4 – Redundant CM-5RB Installation and
Configuration gives further details on redundant common modules.) The multiplexer mode can
also be set to spare (SPAR).
3.7 Channel Module Installation
You do not need to turn off an existing system before adding more channel modules to it. However, to
install channel modules into an existing system without affecting other in-service channels, always
follow these two basic rules:
● Verify that sufficient shelf power is available (Section 3.7.1).
● Verify time slot availability and set time slot and channel direction accordingly (Section 3.7.2).
The new channel module can be placed into any available physical slot on the shelf. Section 3.7.3
gives a channel module installation procedure.
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