ACS-160 Series & STL-160 Series T1 Multiplexer Installation & Operation
4 – Setup & Configuration
Version 2.11, August 2011
4-12
Harris Corporation
Intraplex Products
Table 4-4. TIME Group
Timing
Description
INT
Internal – T1 transmitter of internally timed terminal multiplexer derives its timing from the multiplexer’s
own internal 1.544 oscillator.
EXT
External – T1 transmitter of externally timed terminal multiplexer derives its timing from external timing
source connected to the external timing input pins on T1 I/O connector (Table 2-10)
LOOP
Loop – T1 transmitter of loop-timed terminal multiplexer derives its timing from received T1 signal; that
is, the multiplexer’s T1 output is synchronized to its T1 input.
SEND
SEND appears in TIME group display when the CM-5RB module is set to drop and insert mode but is not
used – Disregard this setting.
THRU
Through – Both CM-5RB modules in the ACS-165 drop and insert multiplexer derive their transmitter
timing through T1 signal received by other module. T1 output of DI-A module is synchronized to T1 input
of DI-B module, while T1 output of DI-B module is synchronized to T1 input of DI-A module (Figures 3-6
and 3-7).
THRU is the only available primary timing mode on the ACS-265 drop and insert multiplexers.
4.4.1
Primary versus Fallback Timing
The timing mode selected by the TIME group setting is the primary timing mode. ACS-160 Series
multiplexers also have a fallback timing mode. The factory setting for fallback timing is internal. When
configured for external, loop, or through timing, if the primary timing source becomes unavailable, the
CM-5RB module performs an automatic, carefully controlled changeover to fallback timing (its own
internal oscillator).
4.4.2
Timing Status Indicator Lights
Three lights on the CM-5RB module (Loop, Int, and Ext) indicate the current T1 transmitter timing
configuration (Table 3-5). If the CM-5RB module is using fallback timing, the indicator light for the
primary timing mode blinks, and the indicator light for the fallback timing mode (factory set to
internal) is on continuously.
Table 4-5. Timing Status Indicator Lights
Label
Description
INT
Internal timing
ON
CM-5RB transmitter is using its internal 1.544 MHz clock.
EXT
External timing
ON
CM-5RB transmitter is using timing provided by external clock.
BLINKING
External timing is selected for primary timing but module is currently using fallback
timing.
Loop
Loop or through timing. On a terminal multiplexer, the indicator lights represent:
ON
CM-5RB transmitter is loop timed.
BLINKING
Loop timing is selected for primary timing; however, the module is currently using
fallback timing.
On a drop & insert multiplexer, the indicator lights represent:
ON
CM-5RB transmitter is through-timed.
BLINKING
Through-timing is selected for primary timing, but module is currently using fallback
timing.
Содержание ACS-163
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