Lucent Technologies Release 8.2 manual Iana, Inads

High Density Bipolar 3-Bit Substitution (HDB3)	Glossary
High Density Bipolar 3-Bit Substitution (HDB3)

I

HDB3 line coding is similar to Bipolar 8 Zero Substitution (B8ZS) in some ways. It replaces every 4 consecutive zero in a stream of AMI-encoded data (see line coding) with either of two sequences. If there has been an even number of 1s since the last substitution, it substitutes the pattern 1 0 0 BipolarViolation, where BipolarViolation is a 3-volt pulse (a 1) of the same polarity as the preceding 3-volt pulse. If there has been an odd number of 1s since the last substitution, HDB3 coding substitutes the pattern 0 0 0 BipolarViolation for the 4-zero string. This system does not corrupt binary data, and is commonly used with E-1lines.

host

Aserver.

host name

See server name.

IANA

Internet Assigned Number Authority.

INADS

Initialization and Administration System

Information element (IE)

The data fields in ISDN messages.

in-service state

The condition or state of an MMCX server that is ready to handle calls.

International Standards Organization (ISO)

A body that defines and/or adopts protocols widely used in the computer and telecommunications industries.

International Telecommunications Union (ITU)

Formerly known as International Telegraph and Telephone Consultative Committee (CCITT), ITU is an international organization that sets universal standards for data communications, including ISDN. ITU members are from telecommunications companies and organizations around the world.

Internet

The decentralized network of networks that grew from ARPAnet and supported by TCP/IP.

		Administration for Network Connectivity
476	CID: 77730	555-233-504 — Issue 1 — April 2000