15 Monitoring
15-18 VPN 3000 Concentrator Series User Guide
Received Frame Too Long
The number of received frame too long errors on this interface port. The size of the packets received
exceeds the MTU (Maximum Transmission Unit). These errors could indicate that the T1/E1 line is not
configured correctly; for example, if you are using a fra ctional T1/E1 line, the timeslots configured
might not match those of the T1/E1 provider.
Transmit Frame Too Long
The number of transmit frame too long errors on this interface port. The size of the transmit packet
exceeds the MTU. These errors could indicate that the T1/E1 line is not configured correctly; for
example, if you are using a fractional T1/E1 line, the timeslots configured might not match those of the
T1/E1 provider.
Received Byte Align Errors
The number of received byte align errors on this interface port. These errors occur when the frame does
not contain a multiple of 8 bits, and could indicate misconfigured timeslots.
Received CRC Errors
The number of received CRC (Cyclic Redundancy Checking) errors on this interface port. These errors
could indicate a lossy or noisy transmission line.
Receiver Overrun Errors
The number of receiver overrun errors on this interface port. These errors occur when the memory
system can’t keep up with the incoming data stream. This number should be zero; if not, check the event
log for system malfunction or contact technical support.
Transmits Dropped
The number of frames dropped on this interface port b ecause the transmission buffer was full. For
example, these errors would occur when trying to trans mit too much data from a 100-Mbps Ethernet to
a T1/E1 line.
Transmit Underruns
The number of transmission underruns on this interface port. These errors occur when the memory
system can’t keep up with the outgoing data stream. This number should be zero; if not, check the event
log for system malfunction or contact technical support.