EXFO FTB-8500 Series for FTB-500 - Manual (Page 178)

Traffic Analyzer Tabs
164 FTB-8500 Series and FTB-8120NGE/8130NGE
Ethernet RX
Errors Analysis

Block (10Gig-E): The number of frames received with an errored
block condition.

Symbol (100/1000 Mbps): A Symbol Error is declared when an
invalid code-group in the transmission code is detected.

Idle (100/1000Mbps): An Idle Error is declared when an error is
detected between the end of a frame and the beginning of the next
frame.

False Carrier (100/1000Mbps): A False Carrier is declared when
data is being received with no valid start of frame.
The following errors are only available with Framed Layer 2 or Framed
Layer 1 with xPAT pattern (10/100/1000Mbps).

FCS: The number of received frames with an invalid FCS.

Alignment (10/100 Mbps): Indicates the number of received
frames without an integral number of octets in length.
The following errors are only available with Framed Layer 2.

Jabber/Giant: The number of received frames larger than 1518 (no
VLAN), 1522 (C-VLAN), 1526 (S-VLAN), or 1530 (E-VLAN) bytes
with an invalid FCS.

Oversize: The number of received frames larger than 1518 (no
VLAN), 1522 (C-VLAN), 1526 (S-VLAN), or 1530 (E-VLAN) bytes
with a valid FCS. Oversize error analysis is only available when
Oversize Monitoring is enabled (see page 163).

Runt: The number of received frames that are smaller than 64
bytes with an invalid FCS.

Undersize: The number of received frames smaller than 64 bytes
with a valid FCS.