Doc No. FM0804 issue 4 Page 12
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8. NETWORK WIRING
The Advent XT2 system requires a minimum of 5 twisted pairs common to all intercom units. On new installations a 6
pair CW1308 cable is recommended; 1 pair for 24V, 1 pair for 0V, 1 pair for data and 3 pairs for audio.
Plan the network route carefully to minimise cable length using the intercom units to join the cable thereby avoiding
additional joint boxes in corridors or roof areas etc. On large installations the network should be split into two or three
smaller legs to reduce the effect of voltage drop and aid future service/fault finding.
The network cable length should not exceed 1200 metres and the total number of network devices on an RS485 data
bus must not exceed 255. A data repeater (P/No. ZXT340) is available for extreme cases.
Single auxiliary devices such as external Manager callpoints, lift speech units and network receivers can be connected
to the system network wiring as shown above.
To eliminate the possibility of data reflections and corruption the network should never be split into multiple legs
from a mid-point in the wiring. Small groups of intercoms spurred off at any point should also be avoided.
If an existing site wiring network has spurs of intercoms they should either be integrated into the main loop or
isolated and connected back separately to the controller as additional legs.
Detailed site plans and existing wiring details are imperative before designing an installation.
Advent XT2
Controller
First
Intercom
Last
Intercom
Manager Callpoint
Network Receiver
Advent XT2
Controller
Advent XT2
Controller
New Leg
Cut
Cut
