TEMA TELECOMUNICAZIONI SRL
GSM Gateway Interface DIAL-112
MAS-DIAL112-REV06EN
Page 11 of 35
Connecting device as NT (ending) and synchronization from NT port
This method of connection requires that DIAL-112 is related to an external ISDN line (ISDN port
TE) of the PBX: in other words, DIAL-112 has the same role of a new NT port. From the
perspective of the PBX, there is no difference between the external lines available, and between
one or more BRI lines existing and the new BRI attack system offered by the DIAL-112 that goes to
be installed.
From the "Sync-NT" connector, DIAL-112 is limited to receive the clock synchronism therefore
does not affect in any way traffic between the NT and the PBX. Please note that the ISDN system
provides the Point-Point and Point-Multipoint variants. To function properly, DIAL-112 must be
configured in the same way as the TE port of the PBX connected to it, and set appropriate fields on
the form PTMP PTP in the “General Parameters” mask of the configuration of the device.
Nota 1 If there are multiple ports in the installation, use the sync one of the existing ones that is
configured as Point-to-point, in order of priority from the following:
1. derive synchronization from a port with Point-to-point setup, on which the disabling of level 1 of
the Protocol ISDN does not happen;
2. derive synchronization from a port with Point-to-point setup, configuring the PBX maintaining
always-on the level 1 on this line;
3. If no described above link type is available, obtain the synchronization from the port that made
the most traffic. This will reduce the chance that the port turns off wasting synchronization while
other lines (and their ports) are active.
Nota 2 If more DIAL-112 are connected to the PBX, make sure that all are synchronized to the
same NT port or S0 bus of the plant. If the customer has NT port (for example, has a PRI) and no
S0 free output to use any of DIAL-112 to synchronize the others (take in parallel the central wires
of the TE-PBX port of the first device and connect them to the Sync NT port of the others).
PO
PBX
1 BRI ISDN
DIAL-112
BUS T0
NT
BUS T0
TE
TE
Internal
Extensions
(BUS T0)
ISDN
Network
