Panasonic Digital Business System - Installation Manual
March 1997
Issue 5
14
Piggy-Back Connections
The DBS can be used a host or subsidiary system. As a subsidiary system piggy-backed from the extension ports
of a host PBX the connection from the host is presented as a series of exchange lines to the DBS. The DBS is
then configured through programming to use those ports as piggy-backed lines and will provide recall signalling to
the host.
The DBS can be configured to provide earth or timed break recall signalling to the PBX. Timed break will operate
on the wiring from the PBX extensions. Earth recall will require the connection of an earth wire from the PBX earth
point to the PBX EARTH connection point on left hand end of the DBS MDF.
If an earth connection is required to the DBS this must also be carried across to the EXT/LINE slot wiring using a
DDK to DDK jumper wire so that any PBX extensions connected there can also send earth recall. The following
diagram shows the location of the connection points on the DBS CCUs.
Figure 7 - PBX Earth Connection Points
Exchange Line / PBX Extension Wiring
Use each DDK to connect two circuits as shown.
Figure 8 - Exchange Line / PBX Extension Connection
