Multi-Tech Systems MT128ISA-UV - Manual (Page 15)

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Chapter 2 - Installation
MT128ISA/PCI
Start>Settings>Control Panel>Modems>ISDN modem>Properties>Connection,
Advanced>Extra settings.
• The Internet PPP protocol is for connecting to Internet and other communications servers
at 64 kilobits per second. Only one B-channel is used, leaving the other free (if supplied
by your ISDN service provider) for a different data transfer operation or a voice or fax call.
• BOD means Bandwith on Demand. BOD first establishes a 1B (64K) data channel and
waits until data traffic is over the value specified in ATS53 (see Chapter 3 for more
information about AT commands). When data traffic goes over this default value (or the
value set in the user-specified AT command), BOD establishes a second B channel and
bundles it to a 128K communication link for better performance. BOD allows greater
flexibility in handling voice and data calls simultaneously.
Bandwidth on demand is very useful where ISDN access is charged for by the minute, since the second B-
channel is only used when the volume on the first B-channel has exceeded a threshold value for a certain
period of time.
Before BOD activates all three of the following conditions must be met:
• Average data traffic is lower than the value (ATS53) in a specific period (ATS54)
• User wants to make an outgoing voice call (picks up the handset)
• There is an incoming voice call (ring signal on an analog telephone device)