Nortel Passport 4400 Using Manual page 129

three. Any four consecutive zeros are replaced with a pattern that includes a
bipolar violation.
HDLC
High-Level Data Link Control. A bit-oriented data link protocol developed by
ISO for full-duplex communications.
HTDS
HDLC Transparent Data Services. Provides end-to-end connectivity between
applications (e.g., X.25 PAD) running over HDLC or SDLC.
hunt group
For the network level, a group of network addresses (DNAs) reachable from a
unique DNA and configured so that an incoming call automatically searches
for an available address in the group.
For incoming voice calls, a group of voice channels arranged sequentially and
with a common telephone number. Every incoming call is assigned to the first
channel in the sequence. If that channel is busy, the call is assigned to the next
channel, etc., until a free channel is found to answer the call.
IEEE 802.2
The IEEE standard that specifies the link layer control (LLC) portion of the
data link layer (DLL) for various media access methods.
IEEE 802.3
An IEEE physical layer standard for LAN protocols (including Ethernet). It
specifies a CSMA/CD (Carrier Sense Multiple Access with Collision
Detection) access method.
IP
Internet Protocol. Part of the TCP/IP suite of protocols defined in RFC 791.
IP address
Internet Protocol address. A 32-bit address used to represent a point of
attachment in a TCP/IP network.
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