User`s manual

EAGLE - ANNEX A-5 ISDN BACKUP FACILITY.

A-5 ISDN BACKUP FACILITY.

A new operating mode allows using the EAGLE over leased lines through the v35 port, in the

way that, if this connection fails, the codec will detect it and automatically make an ISDN call as

a ‘backup’ line of the main one, so the audio link is restored.

Setting microswitch #1 in the UP position activates this mode.

To deactivate this mode, this switch has to be set DOWN.

All changes will be effective next time the EAGLE starts up.

In this mode, two of the automatic start-up configurations are reserved, number C30 for the V35

start-up and C31 for the ISDN backup start-up.

 See microswitches positions in chapter 3.2.

 See chapters 4.2 and 5.3.1.3 to know how to program an automatic start up

position through EAGLE front panel or through the real time control software.

The V35 main connection configuration has to be stored in automatic start-up number 30 and

ISDN backup connection has to be stored in automatic start-up number 31.

- Configuration C30 of both EAGLE units has to be the same.

- Configuration C31 of the EAGLE that generates the ISDN call in case of v.35 failure has to

include the number(s) to call and the AUTOCALL feature has to be active (This is necessary for

the codec to be able to make the ISDN call automatically).

- Configuration C31 of the EAGLE that receives the ISDN call in case of v.35 failure is the same

as the other EAGLE, but in this case no number has to be stored and AUTOCALL has to be off.

 In all configurations, ANALOG CONFIG has to be set to “ON AIR”. Then, the ON

AIR key will be on when the equipment starts-up.

Once the configuration is done, micro-switches 1, 4, 5, 6 and 7 in the EAGLE units will be set

UP and 2, 3 and 8 DOWN. This selects backup and C30 main connection. When both EAGLE

are turned on, they will connect through the main V.35 connection.

Both EAGLE will monitor the V.35 clock signal in the interface. If the V.35 clock signal is not

detected during 5 consecutive seconds (connection lost), the EAGLE will restart using C31

configuration (ISDN).

It is necessary to ensure that in case of line failure, local and remote equipment

loose v35 clock signal. Otherwise, the EAGLE could not detect line failure.

Ask your v.35 Terminal provider for this feature.