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APPENDIX E
ISDN INTERFACE UNIT TYPE 140III
Introduction
The optional ISDN Interface Unit Type 140
messages on high-speed high-quality digital networks. It will allow you to connect
the machine to an ISDN (Integrated Services Digital Network) for either Group 4
or Group 3 fax communication.
CAUTION: When connecting to the ISDN you should use the provided cable.
If a different cable is used, this could cause radio interference with
other equipment.
Attached to the modular cord that is used for the ISDN connection,
there is a ferrite core - please do not remove it.
A few of the features described earlier in this manual cannot be used over an
ISDN. These are as follows.
Manual reception
Telephone line type (DTMF/Pulse dial) selection
Manual dialing with the handset
On Hook Dial
RTI, TTI, CSI (these identifiers can only be used with Group 3 communication.
In Group 4 mode, another identifier called the Terminal ID is used instead. The
Terminal ID is explained on page 265)
However, Group 4 has the following major advantages over Group 3:
If your organization sends large volumes of material by fax, using Group 4 will
greatly reduce your communication costs as a result of the high speed of data
transmission.
Normal analog networks tend to be noisy, affecting the quality of received data.
However, communications over digital networks are of a high quality.
The Group 4 interface will greatly enhance other features, especially
broadcasting, transfer request, and other networking features, allowing complex
distribution of documents with just a few keystrokes. The types of network that
you can set up are described in the Networking section of this manual (see
page 46).
Note: Your sales or service representative will be able to help program all the
necessary group and transfer station numbers in the various broadcasting
terminals throughout your proposed network. Please coordinate with your
sales representative to obtain correct programming at the time of installation.
256
III
allows you to send and receive fax
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