Nortel CTA 500dm Installation Manual page 2

2 CTA 500dm
The CTA 500 dm serves as a digital modem and terminal adapter
(TA). A terminal adapter is a device that allows non-ISDN devices
to work with ISDN. It provides reliable high speed end-to-end
digital connectivity between your computer and a remote data server
using the ICS and the public switched telephone network (PSTN) or
Integrated Services Digital Network (ISDN). The CTA 500 dm
supports Point-to-Point Protocol (PPP) and Multilink PPP (MP),
which are widely supported by Internet service providers (ISPs) for
Internet access and corporate data communication networks
(Intranets) for remote LAN access. PPP and MP are supported as
built-in features of Windows95.
You can also connect a Norstar telephone to the CTA 500 dm to
access Norstar voice services. You can use the same telephone line
to simultaneously carry on a conversation while your computer is
connected to the Internet or remote LAN with no loss of ICS
features. The CTA 500 dm connects to the ICS using standard
telephone cabling.
MP works with intelligent bandwidth management software in the
ICS to provide dynamic bandwidth allocation accessible at your
desktop. Norstar station interfaces support two channels that are
ßexibly allocated to transmit data, voice, or both. When the attached
Norstar telephone is not in use, all bandwidth is allocated for data
trafÞc (up to 128 kbit/s). However, if you want to use the phone to
answer an incoming call, or place a call using the free line or the
intercom, one channel is automatically allocated for the
conversation and the data connection continues at 64 kbit/s. When
you hang up the telephone, the second channel is automatically
reallocated to the data connection.
Using a CTA 500 dm compliant Norstar TAPI Service Provider, the
CTA 500 dm allows simultaneous PPP/MP data connections and
TAPI computer telephony integration (CTI) applications on your
PC.
In addition, some of the ICS resources normally used for voice
applications, such as network access lines and calling line features,
can be used for data trafÞc. Network access lines can be shared
between CTA 500 dm s and other trafÞc within the system. Features
such as call logging, call restriction, and routing based on time of
day can be applied to data trafÞc for facility utilization and
management.
CTA 500 dm On Line Guide
P0873832 Issue 05