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1. Introduction
The ISDN TA (Integrated Service Digital Network Terminal Adapter) is a communication product
for the Internet and digital communication era. It provides high speed and high quality
transmission. The TA supports two analogs and one digital port. The two analog ports act like two
regular telephone lines, which can be connected to regular telephone, answering machine, fax and
modem products. Also, the TA can provide flexible functions like: supplementary service, call
screening, speed dial and global call function to meet user's requirements. The digital port with
the RS232 link can be connected to PC to support data communication with remote site. It
supports many protocol selection such as V.110, V.120, X.75, X.25 on D channel, PPP (Point-to-
Point Protocol), MLPPP (Multi-Link PPP), BACP (Bandwidth Allocation Control Protocol) /
BOD (Bandwidth On Demand) function. With the MLPPP, the entire 128k ISDN bandwidth can
be used to access the Internet. The BOD function can utilize dynamic bandwidth demand under
MLPPP connection. Under MLPPP data connection, the TA will automatically release one B
channel for voice communication when the user picks up the phone to make a call and returns to
two B channels for MLPPP when the phone hangs up. With the BACP function, the 128k capacity
of ISDN can be utilized fully. The TA is equipped with channel bundling feature which allows the
user to use both B channels to maximize the 128k bandwidth for data transmission.
The TA complies with ITU-T Q.921, Q.931 for D channel protocol, and provides switching type
selections for different countries. Following are the switch types supported by the TA:
*Euro-ISDN EDSS1
The TA is equipped with flash EPROM for easy future software upgrade through RS232 port.
D-LINK ISDN TA DMI-128ESU+
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