A physical connection to the earth, chassis, or other reference point

HDB3

High-Density Bipolar Order of 3, three-zero maximum coding for E1 lines. Provides a fourth zero violation for data bytes.

HDLC

High-Level Data Link Control (bit-oriented protocol)

HDSL

High-bit rate Digital Subscriber Line

HSU port

High-Speed Unit port (one of the data ports for this system).

HMI

Host Management Interface

HOM

HDSL OEM Module

ICMP

Internet Control Message Protocol

IEC

Inter-exchange Carrier (also called IXC)

IMUX

Inverse Multiplexer

IMUX port

Aresource port that gives users access to the ISDN network for bandwidth-on-demand applications.

inverted a-law

A variation of a-law encoding that provides a higher ones density on E1 lines.

IP

Glossary

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Zhone Technologies IMACS-200 manual HDB3, Hdlc, Hdsl, Hmi, Hom, Icmp, Iec, Imux