Zhone IMACS-200 ユーザーズマニュアル

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

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

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

High-bit rate Digital Subscriber Line

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

Host Management Interface

HDSL OEM Module

Internet Control Message Protocol

Inter-exchange Carrier (also called IXC)

Inverse Multiplexer

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

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