Linking Two Ccus - Panasonic Digital Business System Installation Manual

March 1997

Linking Two CCUs

CCUs are linked using the connection cables and cards VB3691. The master CCU must be a DBS 90. One CPU
card and one SCC are installed in the master CCU to provide control for the whole system. When two systems are
linked the SCC slot in the slave and AUX 1 slot in the master are not used.
1 Remove the covers from the CCUs. Install the link cards in the AUX 2 slots at the right hand side of the
CCUs. Ensure the master card is installed in the master CCU and the slave in the slave CCU.
2 Connect the wire provided on the slave card to the 24v pin of the 24v and GND terminal CN24 on the
slave CCU.
3 If two DTMF Receiver (MFR) cards are fitted to the system cut the jumper wire marked J3 on either of the
MFR cards. Failure to do this will cause the MFR cards to cancel out and DTMF dialling will not be
recognised by the system.
4 The first extension card of the master CCU must be a Digital extension card (DEC). The remaining
extension cards can be any combination of Analogue extension card (AEC) and DEC.
5 Ensure the switch SW1 on the master connection card is set to the factory default shown in table 5 below.
6 Connect the link cable to the cards through the access holes provided in the chassis of the CCUs.
7 Connect the flying leads from the master end of the connection cable to a frame ground on the master
CCU.
8 Allow for the reinstallation of the CCU covers and install the EMI filters as close as possible to the CCUs
at both master and slave ends.
Panasonic Digital Business System - Installation Manual
1 2 3
OFF ON OFF
Table 5 - SW1 Factory Presets
Figure 5 - Jumper And Switch Locations
SW1 Switches
4 5 6
ON OFF OFF
12
7 8
OFF OFF
Issue 5