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61200.175L1-1 FSU 5622 ESP User Manual 37

Chapter 4. Applications

Switched Mode Application

Switched mode is used to multiplex several remote extensions

(up to 40) to two host ports (see Figure 4-7). This enables many

remote users to have access to a limited number of access lines

on a call-by-call basis. The host unit typically connects two

extensions to a PBX via an FXO module. The remote units

connect to telephone sets via FXS modules.

The host unit is programmed with the extensions and DLCI

information for all of the remote units. This information is

communicated to the remote units over the network.

External Call Origination

When the telephone set on a remote FSU 5622 ESP is taken off-

hook, the local FSU 5622 ESP generates dial tone and waits for a

four-digit extension to be entered by the user. Once the exten-

sion is entered, the remote FSU 5622 ESP transmits this informa-

tion to the host FSU 5622 ESP where it is compared to extension

information in the extension/DLCI table. If the extension is not

located, the host assumes the number is external and attempts to

seize an available port and dial the extension on the PBX. If no

port is available, a trunk busy (fast busy) is returned to the

remote port. After the extension is dialed, the data link is

established and the call remains up until the remote FSU 5622

ESP terminates the call.

External Call Reception

When an incoming call is received from the PBX, the host FSU

5622 ESP auto-answers the call and generates dial tone. At this

point the calling party can dial the four-digit extension of the

party they are trying to reach. The host looks up the extension in

the extension/DLCI table and routes the call appropriately. If

the extension does not exist, the FSU 5622 ESP generates a trunk

busy signal back into the PBX. Otherwise, the host routes the

call to the appropriate port. When the remote party answers the

call, the data link is established and the call remains up until the

remote FSU 5622 ESP hangs up or until a loss of line current is

detected on the FXO port.

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ADTRAN 1204006L1 Manual de usuario Pagina 53