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GL-8 Reference Guide
Ethernet address: Sometimes referred to as a hardware address.
A 48-bits long number assigned to every Ethernet hardware device.
Ethernet addresses are usually expressed as 12-character
hexadecimal numbers, where each hexadecimal character (0
through F) represents four binary bits. Do not confuse the Ethernet
address of a device with its network address.
EtherTalk: Apple’s data-link software that allows an AppleTalk
network to be connected by Ethernet cables. EtherTalk is a protocol
within the AppleTalk protocol set. Two versions of EtherTalk are in
common use, designated as Phase I and Phase II EtherTalk.
extended network: A network using AppleTalk Phase II protocols;
EtherTalk 2.0 and TokenTalk are extended networks. LocalTalk
networks are compatible with Phase II but are not extended
because a single LocalTalk network cannot have multiple network
numbers or multiple zone names.
FCS (Frame Check Sequence): The standard 16-bit cyclic
redundancy check used for HDLC and frame relay frames. The FCS
detects bit errors occurring in the bits of the frame between the
opening flag and the FCS, and is only effective in detecting errors in
frames no larger than 4096 octets. See also
CRC (Cyclic
Redundancy Check
.
FECN (Forward Explicit Congestion Notification): A bit set by a
frame relay network to notify an interface device (DTE) that
congestion avoidance procedures should be initiated by the
receiving device. See also
BECN
.
Filer Server: In the context of a frame relay network supporting
LAN-to-LAN communications, a device connecting a series of
workstations within a given LAN. The device performs error recovery
and flow control functions as well as end-to-end acknowledgement
of data during data transfer, thereby significantly reducing overhead
within the frame relay network.
firmware: System software stored in a device’s memory that
controls the device. The Netopia ISDN Router’s firmware can be
updated.