Panasonic VB-9411ADSUK Operation Instructions Manual page 9

5. Cabling Requirement
Cabling between the Central Control Unit (CCU) and each Panasonic key telephone must be four wire,
and between the CCU and each 2/3 wire apparatus shall be two wire, 0.5mm diameter copper conductor
cable and terminated with LJU, slave socket for Panasonic key telephone and master socket for 2/3 wire
apparatus.
Cable length from the CCU to each extensions should comply with following requirements.
Also cabling from TJF which is not a part of Panasonic system, normally supplied by PTO to the CCU
shall comply with following requirement.
Cabling Max. cable resistance
CCU to ITS
CCU to 1AS
6. Over voltage protection
Surge absorber is fitted to exchange line ports (PA1) and extension ports (1AS) of the system.
If extension cable extends between buildings, surge arresters should be fitted at the point of entry and exit
at both ends of the cable.
7. PBX register recall
SBS can be connected to the extention ports of approved PBXs (piggy backing).
SBS extension ports also connect to the exchange line ports of approved call routing system to work as
host PBX system.
Timed break recall is available to work with another call routing apparatus.
8. Ring eqivalent number (REN)
REN for exchange line port (PA1) is 3.
9. Line feeding
Line feeding from 1AS ports to telephones is derived internally from SBS the Central Control Unit (CCU).
The SBS is not a through-fed system.
Maximum 30mA current is supplied to extension apparatus.
10. Recommended extension apparatus
When using separately approved extension apparatus, any UK approved 2 wire apparatus can be used.
But in order to maximize the benefit Panasonic recommend the apparatus with MF signalling and timed
break recall.
11. Call path delay
Call path delay for each speech direction is as follows.
Call path Max. delay
1000uS
PA1 > ITS
1000uS
PA1 > 1AS
12. In the event of power failure
A battery installed inside of the Central Control Unit (CCU) will back up full operation of SBS for approxi-
mately 15 to 30 minutes (depends on call traffic condition).
When the battery is exhausted up, an exchange line is switched over to power fail telephone socket,
which is installed adjacent to the CCU.
Connect ordinary telephone to originate and receive calls.
40 ohms (loop)
100 ohms (loop)
Max. delay
Call path
1000uS
ITS > PA1
1000uS
1AS > PA1
O-7
Cable length
Max. 240m
Max. 600m
Introduction