Technical data

Applications

IP Audio transmission with automatic ISDN Backup

With the automatic ISDN Backup an Audio transmis-

sion via an IP Leased Line can be backed up. If one of the

systems detects a failure of the IP connection, the Master

system establishes the ISDN connection. During the

Backup the system checks permanently, when the IP con-

nection will be available again. If the IP connection is sta-

ble within the configured interval, the systems automati-

cally switch back to the IP connection. The switch-over to

the backup path requires only a few seconds. The switch-

back to the main path usually last less than one second.

Very important is the fact that different coding algo-

rithms can be selected for the IP and the ISDN path. In

this way, a transmission via IP with apt-X and a bit rate

of 384-kbit/s could be realised. In case of failure, e.g. the

ISO/MPEG Layer 3 algorithm, which provides an opti-

mum quality for ISDN, can automatically be selected.

The configuration parameters allow an adjustment to

various requirements. Additionally, a daily ISDN

backup test can be activated to make sure that the ISDN

network is working when it is necessary.

A similar function is available for a transmission over

the X.21 interface - instead of the IP interface of the sys-

tem.

This function is only available for the MAGIC AC1

XIP Systems.

ISDN Backup via external alarm signal

If an existing primary path contribution (e.g. via satel-

lite) is to be protected with an automatic ISDN Backup,

MAGIC AC1 XIP can trigger the ISDN Backup by an

external TTL alarm signal. As long as the alarm signal is

pending, the backup path remains active.

With the configuration parameters all backup condi-

tions can be adjusted to your requirements. For example,

the maximum backup time and the time period during

which the alarm signal is to be pending before the backup

is triggered can be selected.

Via the TTL or relay output an external Audio switch

can be controlled.