XRT73R12_07 Datasheet, PDF (75/89 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

REV. 1.0.2
XRT73R12
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
TABLE 33: ALARM STATUS REGISTER - CHANNEL N ADDRESS LOCATION = 0XM3
(N = [0:11] & M= 0-5 & 8-D)
BIT NUMBER
NAME
TYPE
DESCRIPTION
2
Receive LOL Condi- R/O Receive LOL (Loss of Lock) Condition Declared:
tion Declared
This READ-ONLY bit-field indicates whether or not the Receive Section
(within Channel_n) is currently declaring the LOL (Loss of Lock) condition.
The Receive Section (of Channel_n) will declare the LOL Condition, if the
frequency of the Recovered Clock signal differs from that of the reference
clock programmed for that channel (from the appropriate oscillator or the
SFM clock synthesizer if in that mode) by 0.5% (or 5000ppm) or more .
0 - Indicates that the Receive Section of Channel_n is NOT currently declar-
ing the LOL Condition.
1 - Indicates that the Receive Section of Channel_n is currently declaring
the LOL Condition and the recovered clock differs by more than 0.5%..
1
Receive LOS Defect R/O Receive LOS (Loss of Signal) Defect Condition Declared:
Condition Declared
This READ-ONLY bit-field indicates whether or not the Receive Section
(within Channel_n) is currently declaring the LOS defect condition.
The Receive Section (of Channel_n) will declare the LOS defect condition, if
any one of the following conditions is met.
• If the Digital LOS Detector declares the LOS defect condition (for DS3 or
STS-1 applications)
• If the Analog LOS Detector declares the LOS defect condition (for DS3 or
STS-1 applications)
• If the ITU-T G.775 LOS Detector declares the LOS defect condition (for E3
applications).
0 - Indicates that the Receive Section of Channel_n is NOT currently declar-
ing the LOS Defect Condition.
1 - Indicates that the Receive Section of Channel_n is currently declaring
the LOS Defect condition.
0
Transmit DMO Con- R/O Transmit DMO (Drive Monitor Output) Condition Declared:
dition Declared
This READ-ONLY bit-field indicates whether or not the Transmit Section of
Channel_n is currently declaring the DMO Alarm condition.
As configured, the Transmit Section will either internally (via the TTIP_n and
TRING_n ) or externally (via the MTIP_n and MRING_n) check the Transmit
Output DS3/E3/STS-1 Line signal for bipolar pulses. If the Transmit Section
were to detect no bipolar for 128 consecutive bit-periods, then it will declare
the Transmit DMO Alarm condition. This particular alarm can be used to
check for fault conditions on the Transmit Output Line Signal path.
The Transmit Section will clear the Transmit DMO Alarm condition upon
detecting bipolar activity on the Transmit Output Line signal.
0 - Indicates that the Transmit Section of Channel_n is NOT currently declar-
ing the Transmit DMO Alarm condition.
1 - Indicates that the Transmit Section of Channel_n is currently declaring
the Transmit DMO Alarm condition.
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