Communications port (also referred to as a serial port). Your ISDN
TA’s communications port allows a maximum rate of 230.4 Kbps. Note
that most computers’ COM ports only allow a maximum of 115.2
Kbps. However, accelerator cards can increase that rate to 230.4 Kbps.
Compression
Reducing the size of data packets without losing any information.
D-channel
The signaling channel on an ISDN line used to carry messages between
your ISDN TA and the public switch.
DBA
Dynamic Bandwidth Allocation. A method of reallocating bandwidth
(such as a B-channel) automatically. DBA allows you to place or
receive a voice call while a MultiLink PPP call is active.
Default
Value set at the factory.
Directory Numbers
The telephone numbers for your ISDN line.
ISDN
Integrated Services Digital Network. Provides a digital telephone
service that allows both data and voice communication over the same
line, at significantly faster speeds than the traditional analog telephone
service. Two types of lines provide access to ISDN: BRI and PRI.
ISDN Call Logging
Displays the five latest incoming and outgoing numbers from the data
and analog ports. To log incoming calls, your ISDN line must support
Caller ID.
ISDN Call Waiting
Allows you to place a voice or data call on hold while you answer an
incoming voice call. ISDN Call Waiting requires Additional Call
Offering on your ISDN line.
Kbps
Kilobits per second. The rate at which data is transmitted between
communication equipment.
Layer 1
The physical layer of communication between the communication
equipment. If layer 1 is down, there is no ISDN connection between the
devices.
MultiLink PPP
Provides a method of combining multiple PPP connections. With a BRI
line, MultiLink PPP aggregates the two 56 Kbps or 64 Kbps ISDN B-
channels, creating a virtual single digital connection of up to 128 Kbps.
National ISDN