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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Data Communications
Page 5-11About Data and Video Communications
5
ISDN Terminal Adapter Data Stations 5
An ISDN terminal adapter data station uses an ISDN terminal adapter as its DCE
to send and receive data and connects to a digital extension jack (MLX port) on
the control unit. If PRI, NI-1 BRI, or T1 Switched 56 facilities (including T1-Tie
trunks using T1 Switched 56 service) are assigned to the MLX port, that port may
be configured as a 1B Data or 2B Data port. In a 1B configuration, only one of the
assigned B-channels is used by the ISDN terminal adapter data station. The 2B
configuration allows the simultaneous use of both B-channels.
The ISDN terminal adapter adapts the DTE to the MLX environment. Instead of
converting digital signals to analog signals as a modem does, the ISDN terminal
adapter maintains a digital data format that allows transmission to another inside
ISDN terminal adapter station or over the PRI, NI-1 BRI, or T1 Switched 56
telephone network.
The ISDN terminal adapter can provide dialing and answering capabilities to the
data station, and can share the MLX extension jack with an MLX telephone.
An ISDN terminal adapter data station can be used to make data calls either over
digital telephone facilities (PRI, NI-1 BRI, or T1 Switched 56 facilities) or to an
ISDN terminal adapter data station inside the system.
There are different types of ISDN terminal adapter data stations depending on the
data station’s capabilities:
■ MLX voice and ISDN terminal adapter data (digital voice-and-data)
■ ISDN terminal adapter (data-only)