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Variants of PBX Cascading
PBX Cascading
PBX Cascading
As requirements grow, the T-Comfort 930 DSL can be operated together with other PBX installations. If you
merely need a larger number of connections, it is easy to link a second PBX (PBX Cascading). If you want to
operate the T-Comfort 930 DSL at several locations with different PBXs, this is possible by PBX Networking
(see page 81).
Variants of PBX Cascading
You can combine two PBXs in order to increase the number of terminals that can be connected. A master
PBX and a slave PBX are connected to one another by means of two cables. The two PBXs essentially
function like a single PBX with a higher number of ports. The master PBX controls the slave PBX. The fol-
lowing PBXs from the product family can be used for cascading:
Functionality of PBX Cascading
PBX cascading requires two twisted-pair leads with RJ45 plugs between the PBXs:
■
Voice data: one lead with all eight pins wired 1 to 1. Connect this to the PCM ports of the PBXs. The
shielded CAT-5 lead may be up to three meters long.
The PCM port is on the add-on module of the T-Comfort 930 DSL. You must therefore install an add-on
module in each of the two PBXs before they can be cascaded.
■
Administration data: one CAT-5 Ethernet lead.
Connect the LAN2 port of the master system’s add-on module with a LAN2 port of the slave system’s add-
on module.
Master system
Slave system
T-Comfort 930 DSL
T-Comfort 930 DSL
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