Data Transparent Mode; Netmod And Ao/Di - Intracom netMod User Manual

Data Transparent Mode

This mode is used for direct communication between netMods. All the data are
received and transmitted transparently from / to the serial port, but they are received
and transmitted with an HDSL framing from / to the B-Channels. In this mode,
netMod uses the unrestricted digital bearer capability for the incoming / outgoing
calls. It does not accept calls with speech or 3.1kHz audio bearer capability. Use this
mode for direct communication with another netMod that also uses this mode. Use a
simple communication program (like Hyper Terminal). You can not use this mode for
communication with other modems.
You can activate the Data Transparent Mode by writing to the S82-Register the value
80.

netMod and AO/DI

AO/DI (Always On Dynamic ISDN) is the most appropriate solution for permanent
connection (Always On) with the Internet using the ISDN network. This technology is
based on the distribution and use of part of the available range of the signalling D
channel of your ISDN line. From the 16kbps, the 9600 bps can be released and be
available for data transfer without causing problem to the ISDN line operation. By this
way, your connection constantly remains open providing you with the advantages of
a leased circuit.
The above technology is accomplished through the use of X.25 and PPP protocols
(PPP over X.25 over D channel) and is combined with the use of B channels and the
ML/PPP protocol when necessary, i.e. for high rate data transmission. Utilizing
Bandwidth on Demand, netMod can connect the B channels in order to achieve
speed rates up to 64 or 128 kbps. The B channels will be disconnected when the
demand for high rate transmissions is no longer required and the connection will
revert to AO/DI state. Some of the advantages of the AO/DI operation are:
•
Software use for "Instant Messaging"
•
Dispatch and receipt of e-mail messages without calling the Internet provider
•
Terminal devices and software can be easily used for verification of credit card
data from commercial stores
•
24 hour Internet connection with no telephone charges
•
B channels availability for telephone calls
netMod can support the AO/DI capability, provided that it is available from the
telephone service provider and the Internet provider, by upgrading only netMods'
software.
User's Manual of netMod Network Termination Unit
59