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4 Operation on a PRI Access
The meaning of the individual displays:
Signal
The ARGUS has received the correct send signal from the remote end
(access or terminal depending on whether operating in TE-Simulation
or NT-Simulation mode) and indicates this by displaying a +. If the Rx
and Tx are on the usual wires, a "=" will be shown after wires; if they are
swapped, an "X" will be shown instead.
FAS
Frame Alignment Signal
Indicates whether the ARGUS could correctly synchronize with the
incoming 2 Mbit data stream's alternating frame identification word or
message word and the, perhaps present, CRC4-superframe structure.
CRC4 det
If CRC4-monitoring is active for the access or the terminal and the
ARGUS is able to synchronize itself to the CRC4 superframe, it will
indicate this by displaying "CRC det +". If "CRC det –" is displayed
together with "Signal +" and "FAS +", this indicates that no CRC4 is
active. To prevent power up effects (transients), we recommend that
you set the display and counter to a defined initial state with a
Code HDB3
Display the transmission code used (currently set to HDB3)
noA-Bit
The remote end uses the A-Bit to signal whether the circuit is available
on their receive side.
noA-Bit + means A = 0: Idle state
noA-Bit - means A = 1: Return direction is not available
noAIS
Alarm Indication Signal)
AIS will be set if a component on the transmission line determines that
the signal they have received is faulty (e.g., in the event, that they lose
frame synchronisation) and has sent a Time -1 (= AIS) to indicate this.
"noAIS = +:" no AIS occurred.
Sa5-Bit (Rx,Tx)
The "Sa5-Bit (Rx)" sent by the ARGUS can be configured in the
Configuration menu (See "Sa5 bits" on page 21 )
Sa6-Bit (Rx,Tx)
The "Sa6-Bit (Rx)" sent by the ARGUS can be configured in the
Configuration menu (See "Sa6 bits" on page 22 )
E-Bit
With the two E-Bits, E1 and E2, the remote end will report any CRC4-
errors that it finds on its receive side in the first or second.submultiframe
(the E-Bit will be set to 0).
"E-Bit11+:" if both E-Bits are set to 1, no error occurred
"E-Bit11+!:" A CRC4-error was found (indicated by the "!"), however the
circuit is in largest part OK (see the E-Bit counter Ecnt or the CRC4
error counter CRCErr)
54
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<Reset>
ARGUS PRI
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