Specifications

Chapter 5 Troubleshooting and Diagnostics Installation and Operation Manual
5-2 Monitoring Performance ASMi-52CQ Ver. 2.12
5.2 Monitoring Performance
Displaying SHDSL Performance
ASMi-52CQ has capabilities for collection of SHDSL parameters performance
diagnostics. The statistics are accessed via the RADview SNMP management
parameters tool. The parameters are listed in
Table 5-1.
Table 5-1. ASMi-52CQ Performance Monitoring Parameters for Current Time
Display Description
Current ES Number of errored seconds in which one or more CRC (Cyclic Redundancy Check)
error events occurred during the current interval. This value is updated every second.
Current UAS Number of unavailable seconds in which a failed signal occurred during the current
interval. This value is updated every second.
Current SES Number of severely errored seconds in which 832 or more CRC error events occurred
during the current interval. This value is updated every second.
Current LOSWS Number of seconds with loss of sync word during the current interval. This value is
updated every second.
Current total CRC Number of CRC error events recorded since the last time the register was cleared.
Current TIMER Time in seconds from the beginning of the interval. This value is updated every
second.
Displaying E1/T1 Performance
When ASMi-52CQ includes G.704 E1/T1 port, the modem has capabilities for
collection of the E1/T1 performance diagnostics. The statistics are accessed via
the RADview SNMP management parameters tool. Statistics collection depends
on the use of the CRC-4 function:
• CRC-4 Enabled (E1), ESF Framing (T1)
When the CRC-4 function is enabled or when T1 is in ESF Framing mode, it is
possible to monitor the data transmission performance end-to-end. The error
detection is derived from the data payload by performing a cyclic redundancy
check (CRC). The resulting CRC checksum is transmitted in addition to the raw
data bits. The receiving end recalculates the checksum and compares the
results with the received checksum: any difference between the two
checksums indicates that one or more bits are contained in the current data
block being evaluated.
• CRC-4 Disabled (E1), SF Framing (T1)
When the CRC-4 option is disabled or when T1 is in SF Framing mode, ASMi-
52CQ does not support the capabilities listed above. However, the modem is
capable of providing statistics of the bipolar violations.