ZyXEL Communications FMG Series User Manual page 47

Table 23 Statistics > Fiber (continued)
LABEL DESCRIPTION
Broadcast This indicates the number of broadcast packets transmitted.
Packets Sent
Broadcast This indicates the number of broadcast packets received.
Packets
Received
FEC Errors This indicates the number of FEC (Forward Error Correction) errors on the fiber connection.
FEC is a technique to control errors in packets and correct errors without transmitting the packets
again. FEC adds redundant information in the packets, so the receivers can identify and correct
the errors in the packets.
HEC Errors This indicates the number of HEC (Header Error Control) errors on the fiber connection.
HEC is a technique to detect and correct errors in the headers of a cell. If there's a single-bit
error, HEC will detect and correct it. If there's a two-bit error, HEC can only detect the error, and
the cell containing a two-bit error will be dropped. If errors occur in more than two bits, HEC
neither detect nor correct the errors.
Packets This indicates the number of packets dropped.
Dropped
Pause Packets This field shows the number of 802.3x pause packets transmitted.
Sent
IEEE802.3x flow control is used in full duplex mode to send a pause signal to the sending port,
causing it to temporarily stop sending signals when the receiving port memory buffers fill.
Pause Packets This field shows the number of 802.3x pause packets received.
Received
IEEE802.3x flow control is used in full duplex mode to send a pause signal to the sending port,
causing it to temporarily stop sending signals when the receiving port memory buffers fill.
Chapter 12 Statistics
FMG Series User's Guide
47