Avaya 6211 Guia Do Utilizador
Appendix D: Applications and Switch Administration
DEFINITY
Communications System
DEFINITY High Speed Link
Page D-30
User´s Guide
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d
PBX to an access endpoint
— An access endpoint is one in
which the data endpoint is connected directly to the public
network via data service units (DSUs) or other similar private
line devices. In this type of connection, the access endpoint is
treated as if it were an extension on the switch. Furthermore,
control information (for example, loopback commands) from
the DSU and the public network would disrupt the connection.
As a result, the signaling on the DS0 is disabled and the switch
will not be able to monitor the channel for on/off hook
signaling.
network via data service units (DSUs) or other similar private
line devices. In this type of connection, the access endpoint is
treated as if it were an extension on the switch. Furthermore,
control information (for example, loopback commands) from
the DSU and the public network would disrupt the connection.
As a result, the signaling on the DS0 is disabled and the switch
will not be able to monitor the channel for on/off hook
signaling.
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Data Endpoint
Requirements
Requirements
Most data endpoints involved in permanent connections support
DTR operation. If the data endpoint does not support the DTR
lead, the DTR option should be set to IGNORE on the HSL. This
will allow the HSL to properly establish and terminate calls.
DTR operation. If the data endpoint does not support the DTR
lead, the DTR option should be set to IGNORE on the HSL. This
will allow the HSL to properly establish and terminate calls.
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Switch Requirements
There are three options available to support permanent
connections through DEFINITY or System 75/85. Each option,
though essentially the same from an application viewpoint, varies
slightly in functionality and operation.
connections through DEFINITY or System 75/85. Each option,
though essentially the same from an application viewpoint, varies
slightly in functionality and operation.
d
Dedicated Switch Connection (DSC)
— DSCs are available on
the System 85 R2V4 and DEFINITY Generic 2. With a DSC, a
connection is established between any two ports (line or trunk,
voice or data) on the same switch — the connection does not
go beyond the switch. Therefore, to establish a permanent
connection across a network of System 85/Generic 2s, a DSC
must be established on each switch. When the switch detects a
failure on a DSC, it will make an attempt to re-establish the
connection and continue to do so until the connection is
restored. DSCs can also be used to provide connections to
access endpoints, such as DSUs.
connection is established between any two ports (line or trunk,
voice or data) on the same switch — the connection does not
go beyond the switch. Therefore, to establish a permanent
connection across a network of System 85/Generic 2s, a DSC
must be established on each switch. When the switch detects a
failure on a DSC, it will make an attempt to re-establish the
connection and continue to do so until the connection is
restored. DSCs can also be used to provide connections to
access endpoints, such as DSUs.
d
Permanent Switched Call (PSC)
— PSCs are available on
System 75 R1V2, R1V3 and DEFINITY Generic 1. PSCs are
dialed data calls made automatically by the switch. The only
difference between a PSC and a regular switched call is that
PSCs remain connected for an indefinite amount of time. In a
PSC, one endpoint resides on the switch originating the call
while the other endpoint can reside on the same switch or
through a network to another switch. PSCs can only be
established between switches or intra-switch, they cannot be
used to provide connections to access endpoints such as DSUs.
dialed data calls made automatically by the switch. The only
difference between a PSC and a regular switched call is that
PSCs remain connected for an indefinite amount of time. In a
PSC, one endpoint resides on the switch originating the call
while the other endpoint can reside on the same switch or
through a network to another switch. PSCs can only be
established between switches or intra-switch, they cannot be
used to provide connections to access endpoints such as DSUs.