Ericsson LBI-39001 Manual del operador descargar pdf (Pagina 6)

Alternately, the radio user can terminate a call by pressing the SPC or Clear key. In this case, EDACS sends the call drop

message to the IMC, which passes the drop message to the Jessica PI. On receiving the drop message, the PI disconnects the

telephone call connection to the MD110.

Telephone-Originated (Inbound) Calls

When the PSTN user dials the telephone number for the Jessica MD110, the PSTN routes the call to the MD110. Once

the connection is established, the PSTN user hears a dial tone generated by the MD110. This dial tone is the prompt for the

user to enter the access code and identify the desired destination radio or group.

The dialed digits are received by the MD110, which then processes the digits and routes the call to the PI. The PI

analyzes the digits passed from the MD110 and signals the IMC to set up an interconnect call to the indicated individual radio

or group.

The IMC identifies the site or sites that the individual or group members are logged on to and initiates a channel

assignment at those sites. The control channel directs the radio(s) to the assigned working channel. The channel confirmation

is passed back to the PI via the IMC. The PI then sends an alerting ringing indication back to the PSTN caller.

The radio user is alerted to the active interconnect call by a ringing tone generated by the IMC. The radio user accepts

the call by depressing the PTT button. This message is passed back to the PI, which then indicates to the MD110 and hence

the PSTN caller, that the radio has answered. The audio connection is then established and the call proceeds.

The call termination is identical to the process described for radio-originated calls.

1.3. FEATURES

The features of Jessica can be grouped into three classes: system features, telephone user features, and radio user

features. A list of the features in each class of calls is given below.

System Features

• Basic centralized telephone interconnect, with inbound and outbound calls supported.

• Up to 30 simultaneous calls for European, Asian, and South American systems with a digital E1 link. Up to 23

simultaneous calls for North American and Japanese systems with a digital T1 link.

• Encrypted voice calls.

• Full duplex telephone calls.

• ISDN interface to the PSTN.

• Automatic line clearing.

• Authorization code disable for inbound calls (optional).

• Activity Reports showing operational statistics collected by the PI. These reports can be spooled to disk or redirected to

port 2 of the PI.

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Ericsson LBI-39001 Manual del operador Pagina 6