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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.

LBO - Line Build Out

An equalizer network between the Alcatel-Lucent 1850 TSS-60 and the DSX panel. It guarantees

the proper signal level and shape at the DSX panel.

LED - Light Emitting Diode

Used on a circuit pack faceplate to show failure (red) or service state. It is also used to show the

alarm and status condition of the system.

365-372-603R2.0

Issue 1 January 2009

G L- 2 1

Table of Contents

Alcatel-Lucent 1850 TSS-60 Installation And System Turn-Up Manual page 375

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