32
SMG digital gateway
Slip up
—number of positive bit slips for the stream.
Slip down
—number of negative bit slips for the stream.
RX bytes
—number of bytes received from the stream.
TX bytes
—number of bytes sent to the stream.
Short packets
—number of received packets of a smaller size than the standard one.
Big packets
—number of received packets of a larger size than the standard one.
RX Overflow
—buffer overrun error counter.
CRC errors
—CRC error counter.
TX underrun
—stream transmission failure counter.
Code violations counter
—signal code sequence failure counter.
CRC Error Counter / PRBS
—number of CRC errors (in the
PRBS test
mode).
Bit error rate
—number of bit errors for the stream.
Select
—when checked, clicking the
Reset Counters
button will clear the collected statistics.
Remote loop
—Е1 path test mode, where the signal received by the unit from the connected Е1
stream is transmitted directly in the same stream.
PRBS test
—enables pseudorandom sequence output to the output port of the unit (transmitted
into the connected Е1 stream); at that, the error detection mode will be enabled at the unit input
port (Е1 stream reception) for this sequence in order to evaluate the signal transmission quality.
The number of errors and analysis time counter will be displayed in the stream information
window.
PRBS test and local loop
—Е1 path test mode, where external line is disabled and the signal
transferred by the unit is transmitted directly in the input of the same unit. Pseudorandom
sequence output will be enabled to the unit output port; the input port will operate in the error
detection mode.
Stop test
—disables the test mode.
4.1.2.3
E1 Channel Monitoring
This section
5
contains information on E1 stream channel status.
5
Only one E1 stream is available in an SMG-2 device by default. To activate another one, a special licence is required. For
more information about licences, see section
4.1.19
.
Licence Renewal