Nortel Passport 4400, Инструкция по использованию, Страница: 128 / 144

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206906-D Rev 00 4.2
Ethernet address
A 48-bit media access layer (MAC) address composed of an assigned
six-octet manufacturer’s code and a unique number (such as a serial number)
provided by the manufacturer.
extended superframe (ESF)
One of the framing formats for a T1 DS1 line. It consists of 24 frames of 193
bits each, with the 193rd bit providing framing, error-checking and
performance information. An enhanced version of D4 (superframe).
filter
As used in LAN bridging and routing, to selectively discard packets of a
certain type.
flash
A special type of EEPROM that can be erased and reprogrammed in blocks
instead of one byte at a time.
FRAD
Frame Relay Access Device. A device providing connectivity to a frame relay
network for non-frame relay devices.
FRUNI
Frame Relay User-to-Network Interface. A standard interface between the
user device and the frame relay network.
gateway
A system that converts the protocols and conventions of one network to those
of another. Also, a system that forwards traffic between networks, based on
network layer information and routing tables. It maps on all seven layers of
the OSI model.
GCM
Global Circuit Manager. A Passport 4400 software device that monitors and
controls the use of available WAN ports on the Ethernet Base Module.
HDB3
High Density Bipolar 3. A zero suppression coding method in E1
transmission systems. It limits the maximum number of consecutive zeros to