Comdial FX Series Especificações descarregar pdf (Página 88)

The system denies access, and routes a DISA call to a pre-programmed device such as a station

telephone, or proprietary voice mail, under the conditions listed below:

•

a caller dialing an invalid authorization code,

•

a caller dialing restricted or invalid features,

Comdial has taken reasonable steps in the design of all product features, including DISA, which

protect against unauthorized or fraudulent access to, or use of, a system, or which protect against

unauthorized, fraudulent or unaccounted-for access to, or use of, long distance lines. However, no

system is entirely invulnerable or immune from unauthorized or fraudulent access or use, or

unaccounted-for access or use, and therefore Comdial disclaims any and all liability, and makes no

warranty, express or implied, relating to unauthorized or fraudulent access or use, or

unaccounted-for access or use.

NOTE: Comdial engineers do not recommend DISA for use on loop start lines without disconnect

supervision. While DISA will function, Comdial will not be liable for its performance under

any condition where disconnect supervision is not provided.

NOTE: Callers that use DISA to access a line group and place calls (line to line calling) may

experience low audio levels on their calls due to the normal line resistance of CO lines. A low

audio level is usually only noticeable on long line loops. If signal loss is a problem at a

particular site, the installer may need to add a line amplifier (repeater) in the DISA line.

In regard to the above note, the system software adds +3dB of gain to the DISA lines as a default

setting, and provides a means for the installer to disable this gain if necessary. The software also

provides a means by which DISA callers can pre-select the gain on a DISA line before they select

the line for use. They can dial a code to select either 0dB, +3dB, or +6dB of gain.

It is important to note that uncompensated line–to–line DISA connections often exhibit low audio

levels due to double loop copper losses. While adding gain to these connections will sometimes

improve audio signal levels, the added gain may also result in circuit instability in some connections.

This instability presents itself as a singing sound that can interfere with dialing or voice

communications. If callers experience dialing problems or hear a singing sound in their calls, they

should select a lower gain setting for use.

84 – Understanding the Features

GCA40–242 General Description

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Comdial FX Series Especificações Página 88