IBM SC30-3681-08 manual Statistics for V.34 Interfaces and Dial Circuits, Missed Frame

Con®guring V.34

Missed Frame

When a frame arrives at the device and there is no buffer available, the hardware drops the frame and increments the missed frame counter.

too long (> nnnn bytes)

Number of packets received that were greater than the con®gured frame size (nnnn) and as a result were discarded.

aborted frame

Number of packets received that were aborted by the sender or a line error.

DMA/FIFO overrun

The number of times the serial interface card could not send data fast enough to the system packet buffer memory to receive packets from the network.

L & F bits not set

On serial interfaces, the hardware sets input-descriptor information for arriving frames. If the buffer can accept the complete frame upon arrival, the hardware sets both the last and ®rst bits of the frame, indicating that the buffer accepted the complete frame. If either of the bits is not set, the packet is dropped, the L & F bits not set counter is incremented, and the buffer is cleared for reuse.

Note: It is unlikely that the L & F bits not set counter will be affected by traffic.

Output frame counters:

DMA/FIFO underrun errors

Number of times the serial interface card could not retrieve data fast enough from the system packet buffer memory to transmit packets onto the network.

Output aborts sent

Number of transmissions that were aborted as requested by upper-level software.

V.34 and the GWCON Commands

While V.34 has its own monitoring process for monitoring purposes, the router also displays con®guration information and complete statistics for devices and circuits when you use the interface, statistics, and error commands from the GWCON environment. You can also use the GWCON test command to test DCEs and circuits.

Note: Issuing the test command to the V.34 serial interface causes the current call to be dropped and re-dialed.

For more information on the GWCON command, see ªChapter 10. The

Operating/Monitoring Process (GWCON - Talk 5) and Commandsº on page 127.

Statistics for V.34 Interfaces and Dial Circuits

Use the interface command at the GWCON (+) prompt to display statistics for V.34 serial line interfaces and dial circuits.

Con®guring V.34 607