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4.4.3 External Sync mode
In this mode, the PABX is used as the TE side and the 212/112 is used
as the NT side of the ISDN connection. However, the Sync (timing) is
delivered from the PABX to the 212/112 over a second cable (a straight
RJ-45 cable, provided with 212/112). This cable connects to any NT
port of the PABX, without interrupting the traffic. If more than one
212/112 need to be connected to the PABX - a chain connection can be
used such that the first 212/112 provides timing to the second, the
second 212/112 to the third and so on.
PABX
TE
NT
TE
212/112
Other ISDN
telephones may be
connected here
