E&M Card - Panasonic Digital Business System Installation Manual

March 1997
E&M Card
The E&M card (VB3663) is an interface card to provide a wide area DBS networking facility using E&M Private
lines . Each E&M card provides three circuit connections.
The E&M card allows the DBS to be connected to equipment with a 2-wire plus E&M (ABEM) / DC5 interface.
This type of equipment includes DC5/AC15 converters and Multiplexers (MUXs). Therefore each circuit uses all
four wires from a DDK.
When an E&M card is installed the -48v PSU must be installed in the same CCU to power it. there are restrictions
on the number of cards and where they can be fitted in to the CCU dependant upon system size.
This table shows the maximum number of E&M cards which can be installed in each DBS system and the slots in
which they can be used.
Note 1: The first LINE slot of all DBS systems, is reserved for power failure operation, therefore the E&M card
cannot be installed in this slot.
Note 2: On DBS128, DBS 158 and DBS 180 a maximum of 2 E&M Cards may be fitted in the each CCU
cabinet.
The interface consists of 4 wires A, B, E & M. A & B are used for the speech path. E & M are used for control
signalling. E (Ear) is used for receiving signals and M (Mouth) is used for transmitting signals. When connecting
to other equipment usually connect E to M and M to E. In some cases other equipment may reverse the E and M
labels meaning them to match incoming wiring therefore always check the connections required before installing.
Up to four DBS's can be networked. When building a network, any connection pattern can be used provided
private circuit connections are available. Each E&M Card will support up to 3 circuits.
Panasonic Digital Business System - Installation Manual
System Max. E&M Cards
DBS 38
DBS 68
DBS 90
DBS 128
DBS 158
DBS 180
Table 8 - E&M Card Allowed Slots
Allowed Slots
1 EXT/LINE
2 LINE 2
EXT/LINE
2 LINE 2
LINE 3
EXT/LINE
3 LINE 2 - MASTER
LINE 3 - MASTER
EXT/LINE - MASTER
LINE 1 - SLAVE
EXT/LINE - SLAVE
4 LINE 2 - MASTER
LINE 3 - MASTER
EXT/LINE - MASTER
LINE 1 - SLAVE
LINE 2 - SLAVE
EXT/LINE - SLAVE
4 LINE 2 - MASTER
LINE 3 - MASTER
EXT/LINE - MASTER
LINE 1 - SLAVE
LINE 2 - SLAVE
LINE 3 - SLAVE
EXT/LINE - SLAVE
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