Specifications

LBI-39000B OVERVIEW
8
The Jessica subsystem is shown below.
I
M
6-Wire
4-Wire
Audio
Jessica
RS-422
EDACS
System
Administrators
PI
MD110
MUX
Interface
EDACS
T1/E1 ISDN
T1/E1 Audio
PSTN/PBX
Interface
PSTN
Extension
Interface
Extensions
EDACS
EDACS
Radios
Radio
C
P
I
M
EDACS
Multisite
Network
Modem
PSTN
MD110 Terminal
RS-232
RS-232
PI Admin Terminal
System Manager
RS-232
Audio
Cards
T1/E1
Audio
Cards
T1/E1
Figure 2 - Block Diagram of Jessica
This manual includes instructions for installing Jessica around the world, so it will contain references to both T1 and E1
(digital multiplexed interface standard) installation procedures. In some places the notation 23/30 is used; the 23 indicates the
number of T1 voice channels and the 30 indicates the number of E1 voice channels. The configuration and installation of the
MD110 are covered in the Ericsson documentation shown in the list that follows (documents with the BC number). A section
on configuring the MD110 is provided in LBI-39039, and a sample configuration disk is also supplied. Jessica is not a local
interconnect system associated with EDACS single-site systems. For information on local interconnect, refer to LBI-38513.