Ericsson MD110 - 3 Configuration; Edacs Jessica External Interface Configuration Definition; Number of Telephone Interconnect Audio Channels;Lines

CONFIGURATION LBI-39039B
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3. CONFIGURATION
This section covers configuration considerations and preparations which must be completed prior to installing the Jessica
PBX Gateway equipment.
3.1. EDACS JESSICA EXTERNAL INTERFACE CONFIGURATION DEFINITION
Jessica interfaces with the PSTN or PBX switching equipment through several configurations: directly to the PSTN,
directly to the customer PBX, or directly to the PSTN and the customer PBX. These interface configurations are shown
below.
Figure 2 - Jessica PBX Gateway Configurations
3.2. NUMBER OF TELEPHONE INTERCONNECT AUDIO CHANNELS/LINES
Either a T1 or an E1 ISDN trunk is used to provide the Jessica internal interface connection between the PI and the
MD110. The type of digital trunk to be used depends on the digital interface standards followed by the country of
installation. Use of a T1 line allows up to a maximum of 23 simultaneous interconnect calls to be handled by Jessica. Use of
an E1 line allows up to a maximum of 30 simultaneous interconnect calls to be handled by Jessica. The number of audio
channels provided between the IMC and Jessica, and the number of termination lines provided between Jessica and the
external switching equipment must be sized with the limitation above in mind. Consideration must also be given to
maintaining an equal balance between the number of audio channels and termination lines provided. It is highly
recommended that an equal number of audio channels (between the IMC and Jessica) and termination lines (between Jessica
and the external switching equipment) be used. Failure to implement a balanced configuration may result in interconnect call
blocking within Jessica.
EDACS JESSICA MD110
EDACS
JESSICA
EDACS JESSICA
PSTN
PSTN
Customer
PBX
Customer
PBX
PSTN
Trunks
Trunks
Trunks
1. Directly to PSTN
2. Directly to Customer PBX
3. Directly to PSTN and Customer PBX
MD110
MD110