Charles Industries 31929E - Manual (Page 8)

Section 319–29E–202
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3.5 Transmit And Receive Signal Detectors
The 3192–9E provides Monitoring Signal Detectors on the transmission paths. These detectors provide a mainte-
nance aid for installation and troubleshooting.
3.6 Network Side Signal Detector
This detector monitors the unit’s transmit path and looks for signal activity from the network. When a LOS (Loss
Of Signal) is detected, as indicated by receipt of 175 +75 consecutive zeros, it will illuminate the front panel NET
LOS LED. When an AIS (all ones) signal is detected, the unit will flash the front panel NET LOS LED.
3.7 Customer Interface Signal Detector And Receive Side AIS Generator
The Customer Interface Signal detector and receive side AIS generator are used together and provide several
important maintenance features that can sectionalize problems across the customer interface. Operation of this
AIS generator feature is controlled by switch S3–2 (another AIS generator, not controlled by S3–2, sends AIS
toward the CI upon loopback). The Customer Receive Side AIS generator is enabled by placing S3–2 in the AIS
position and disabled when S3–2 is in the DISABLE position.
3.8 Customer Interface LOS (AIS Enabled)
The Customer Interface Signal detector continuously monitors the unit’s receive path. If a LOS (Loss Of Signal) is
detected, as indicated by receipt of 175 +75 consecutive zeros from the customer’s equipment, a LOS is de-
clared. This is shown as the transition from State 1 to State 3 (see Figure 5). In State 3, the unit will now send an
AIS signal toward the network as an indication that the customer equipment is disconnected or not operational.
The CI LOS LED will flash since the unit is sending AIS.
3.9 Loss Of Customer Interface Signal Alarm
When the Customer Interface (CI) Side Signal detector has declared a LOS condition, it will also forward a signal
to the shelf LOS bus, which is summarized by the 3192–9F module mounted in the far right hand position of the
STS shelf assembly. This alarm output can be disabled by placing switch S3–1 in the DISABLE position. To allow
the LOS alarm from the 3192–9E to be forwarded to the shelf alarm buss, place S3–1 in the LOS ALM position.
3.10 AIS Override (State 3
'
State 4)
With the unit in State 3 it is possible to override the AIS signal generator and cause the unit’s receive path to be
cut-thru from the customer equipment to the network. This override is accomplished by sending the unit a Loop-
down signal in the SF, or ESF formats as previously described. When the loopdown signal is received, the unit
will stop sending AIS and enter State 4. If the CI signal subsequently returns, the unit will transition back to State
1 (idle). Alternately, the unit can be placed in the loopback state by receipt of a valid loopback code. This is
shown as the State 4 to State 2 transition.
3.11 Customer Interface LOS (AIS Disabled)
When the AIS feature is disabled (S3–2 in the DISABLE position), the CI LOS detector monitors the unit’s receive
path and looks for signal activity from the customer equipment. When a LOS (Loss Of Signal) is detected, as indi-
cated by receipt of 175 +75 consecutive zeros, it will illuminate the front panel CI LOS LED (LOS LED will not
flash). When the CI signal returns, the CI LOS LED will extinguish.
3.12 Signal Test Access Jacks
The 3192–9E provides both splitting and monitor bantam jack access on the DSX side of the unit. The splitting
jacks provide access looking toward the 3192–9E and are labeled RPT (repeater).
3.13 Span Current Test Points
The 3192–9E provides front panel test points that can be used to measure the CI side simplex current. When the
unit is in the POWER mode (S1 in the PWR position), the reading across both the RCV and XMT sides should be
0.6 +0.03V indicating 60mA of span current. If only sealing current is supplied on the CI loop (S1 in the SC posi-
tion), the voltage reading should be approximately 0.12 volts (i.e. 12mA across 10 ohms).