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Function Unit

Refers to any one of a number of different circuit packs that can reside in the A/B, D, or G function

unit slots on the Alcatel-Lucent 1665 DMXtend.

GNE - Gateway Network Element

A network element that has an active X.25 link. Can also be a DSNE.

Hairpin Routing

A cross-connection between function units (inter-function unit). For example, function unit C to

function untis A, B, or D. Also, a cross-connection within the same function unit (intra-function

unit). Cross-connections go through Main, but no bandwidth or time slots are taken from the

backbone ring. Eliminates need for another shelf.

Holdover

An operating condition of a network element in which its local oscillator is not locked to any

synchronization reference but is using storage techniques to maintain its accuracy with respect to

the last known frequency comparison with a synchronization reference.

IC - Internal Clock

Used in synchronization messaging.

See shelf ID and site ID.

IR - Intermediate Reach

A term used to describe distances of 15 to 40 km between optical transmitter and receiver without

regeneration. See long reach.

IS - In Service

One possible state of a DS1, DS3, or EC-1 port. Other possible states are "auto" (automatic) and

"nmon" (not monitored).

Jitter

Timing jitter is defined as short-term variations of the significant instants of a digital signal from

their ideal positions in time.

GL - 2 0

Alcatel-Lucent 1665 DMXtend R10.0

365-372-327R10.0 Issue 1

January 2013

Table of Contents

Alcatel-Lucent 1665 Installation Manual page 356

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