Expand Configuration and Management Manual (G06.24+)

Subsystem Control Facility (SCF) Commands
Expand Configuration and Management Manual—523347-008
15-89
SWAN Concentrator Lines
DRIVER
displays the counters used to account for errors in received frames. The driver
counters apply only to the link between the input-output process (IOP) and the
communications line interface processor (CLIP), that is, the CLB.
Total Frms
is the total number of frames that have been transmitted and received between
the communications access process (CAP) and the CLIP since THRESHOLD
number of frames was last transmitted. THRESHOLD applies only to lines
attached to the SWAN concentrator.
Line Quality
is the line-quality value computed every 500 frames. This value is not alterable.
Line quality is computed using the following formula:
100 * (( TOTAL FRAMES - ERROR FRAMES ) / TOTAL FRAMES)
Line Quality reports a value below 100 only when the result of the formula
is 95 or less; that is, when less than 95 percent of the packets are error-free.
Low line quality generally indicates a Layer 2 problem. Refer to Section 21,
Troubleshooting, for Layer 2 troubleshooting information.
No Buffer
is the number of times read buffer space for the driver could not be obtained in
order to read a frame since statistics were reset using the STATS RESET
command.
Err Frms
is the number of times the Layer 2 timer expired when the line was up and not
idle, plus the number of frames received with BCC errors since the
THRESHOLD number of frames was last transmitted.
BCC Errs
is the number of invalid frames received from the CSS driver since the
THRESHOLD number of frames was last transmitted.
Modem Errs
is the number of times the Carrier Detect (CD) or Data Set Ready (DSR) signal
was lost by the communications hardware device for this IOP since statistics
were last reset using the STATS RESET command or since the line-handler
process was started.