6.0 Understanding The T1 Alarms And Indicators
Most of the T1 alarms and indicators (LEDs) are located on the front-edge panel of the DXPT1 board, while
several are located on the front edge of the DXOPT-SYN card. The following sections discuss the alarms and
indicators.
NOTE: Red /Yellow LEDs, when lit, indicate errors or non-standard configuration for normal operation.
Red Alarm (red LED)
When this LED indicator is lit, the system cannot establish communications with
the network.
Yellow Alarm (yellow LED)
The yellow alarm is lit whenever the far end has lost synchronization to its
incoming signal. In the superframe format, a transmitted yellow alarm has a zero
(0) bit in the second bit position of every eighth-bit. In the extended superframe
format, a transmitted yellow alarm consists of repeating 16-bit patterns
containing eight binary one (1) bits followed by eight binary zero (0) bits on the
facility data link.
Sync Alarm (red LED)
This LED (labeled SYNC LOSS), when lit, indicates that the frame bit in the
received data cannot be found.
Signal Alarm (red LED)
The signal alarm (labeled SIG LOSS) turns on to indicate that the DXP has lost
its incoming signal.
Blue Alarm (red LED)
When this alarm indicator is lit, the alarm indication signal (AIS) consisting of
all one (1) bits is being received to indicate that the far end has lost its received
signal. The purpose of this signal is to maintain the system clocks during a link
failure.
Bipolar Alarm (red LED)
The system converts the digital bitstream in T1 communications to a bipolar
format through a process called alternate mark inversion (AMI). The voltage
polarity of the ones pulses (marks) alternates between Plus and minus with a zero
(space) represented by no pulse. A bipolar violation occurs whenever two
successive pulses are of the same polarity. This alarm LED indicates a bipolar
violation (BPV) has occurred. It is important to note that BPV errors are not
passed through regeneration points.
IMI89–193
Installing The DXPT1 Line Board
26 – Installing The DXPT1 Line Board
Содержание DXP Plus Series
Страница 1: ...Digital Communications System R ...
Страница 363: ...Automatic Call Distributor Technical Manual R QuickQ DXP ...
Страница 424: ...Automatic Call Distributor System Manager s Guide R QuickQ DXP ...
Страница 500: ...Wrap up Time 1 6 Wrapping Up A Call 4 3 Z Zoom Box A 2 GCA70 271 Index I 3 ...
Страница 628: ...Interconnecting The VMI X Installing And Programming For ExecuMail IMI89 206 Installing And Programming For ExecuMail 5 ...
Страница 677: ...Connecting The Equipment Installing And Programming The OPX X IMI89 209 Installing The OPX X 7 ...
Страница 728: ...DP I I I I and FX Series Digital Communications Systems Understanding The Visual Man Machine Interface COMDlA ...
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