IBM SC30-3681-08 manual Length of time since the port was reset, Alignment byte length

Monitoring PPP Interfaces (Talk 5)

Line speed

Con®gured line speed or default value assumed (if line speed is con®gured as 0).

Last port reset

Length of time since the port was reset.

CRC error

The number of packets received that contained checksum errors and as a result were discarded.

Alignment (byte length)

The number of packets received that were not an even multiple of 8 bits in length and as a result were discarded.

Too long (> 2048 bytes)

The number of packets that were greater than the con®gured frame size, and as a result were discarded.

Aborted frame

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

DMA/FIFO overrun

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

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.

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

The number of times the serial interface could not retrieve data fast enough from the system packet buffer memory to transmit them onto the network.

Output aborts sent

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

508MRS V3.2 Software User's Guide