Proximus Forum 500 Series, Руководство по монтажу и пусконаладке

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IP Network Connections
232 PBX Networking
Note: The active transmission system itself gets its L1 clock either
from the network operator or from a clock generator connected
by wire.
Connection via the Public Network
Point-to-point connections via the public network of a network operator can
be used for bridging distances beyond 50 km. Due to the long distance
involved, for technical reasons it is not possible to synchronise the L2 protocol.
Consequently, the public network is normally the protocol master for protocol
layers L1 and L2. One PBX is therefore the L3 master and the other PBX the
L3 slave.
Point-to-point connection via a public network
IP Network Connections
If you are operating a fast and continuous network or internet connection at
two or more sites, you can also network the PBX systems via a network
connection.
There are two different protocols available for networking TC systems via
network connections: Q.SIG-IP and SIP tie line. The various features of these
protocols are summarised in the following table:
TC system networking via network connections
Feature Q.SIG-IP SIP tie line
Establishing a call (“basic call”) with
call-number transmission yes yes
name information transmission yes yes
single number dial possible yes yes
transparent codec interconnection no yes
automatic feature detection no yes
PBX 1
L1 slave
L2 slave
L3 master
PBX 2
L1 slave
L2 slave
L3 slave
Public
network
L1 master
L2 master