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4. Monitoring the Hotwire DSL System
4-8
April 2001 8000-A2-GB26-50
SAR Stats (SAR Statistics) B-B-B
Displays a list of SAR statistics for the ATM port on the cards with an ATM Network
Interface.
The counters increment in real time and you may press Ctrl-r at any time to reset the
counters.
Port Name
– Name of port (sar1).
Received
– Number of bytes/packets/errors received by the ATM port since the last reset.
Bytes – Number of bytes received via the ATM port from the SCM card.
Packets – Number of the following types of packets received via the ATM port from
the SCM card:
– Filtered = Packets filtered as invalid and dropped.
– EFCI = Packets with congestion bit set.
– CLP1 = Packets with Cell Loss Priority bit set to 1.
Errors – Number of packets received in error because:
– Bad Channel = Destination DSL port on this card has not been configured or is
no longer connected.
– Overruns = Packets dropped because the card’s receive buffers are full.
– Length = Value defined in the AAL-5 size field is not equal to the actual packet
length.
– Bad CRC = Calculated CRC value does not match value contained in the
header.
– Bad HEC = Calculated header check value does not match value contained in
the header.
– Abort = An abort cell was detected while the packet was being reassembled.
– Startless = An end cell was received while looking for a start cell.
– Endless = An start cell was received while looking for an end cell.
Transmitted
– Number of bytes/packets/errors transmitted to the ATM port since the last
reset.
Bytes – Number of bytes sent via the ATM interface to the SCM card.
Packets – Number of packets sent via the ATM interface to the SCM card.
– Discarded = Number of invalid packets not sent.
– EFCI = Packets with congestion bit set.
– CLP1 = Packets with Cell Loss Priority bit set to 1.
Errors – Number of packets not sent because of the following errors:
– Bad Channel = The Virtual Channel Connection (VCC) to the SCM is down and
no packets can be sent.
– Underruns = Packets not available to send from SAR interface.
– Length = Packets dropped because they are too short or misaligned.
– MTU Exceeded = Packets dropped because they are longer than the MTU
(Maximum Transmission Unit) size specified for the interface.
– Buffer – Packets dropped because the transmission buffer is full.
SAR Patch – Current SAR enhancement code UBR/CLP is enhanced for UBR
traffic with CLP marking.
Table 4-2. Physical Layer Options (3 of 8)