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ISDN Explained
Recent years have seen the introduction of ISDN, a tool
for businesses which unleashes a whole new concept to telecommunications.
MSN/DDI
ISDN allows multiple telephone numbers over fewer channels.
It allows an ISDN 2 circuit (2 lines) to have for example
20 different incoming telephone numbers, each of which can
be handled differently. For example, each system extension
can have it's own incoming direct telephone number, your fax
number may be routed through the system to the fax extension.
The main benefit of this is cost. You no longer have to have
a separate line for faxes, modems, alarms, private lines or
projects requiring new numbers.
CLIP caller ID
As ISDN provides digital signalling between the local exchange
and your telephone system supplementary information is also
transmitted down the circuits. This information includes caller
ID, extension numbers, and call setup information enabling
enhancements such as voicemail systems, CTI (Computer Telephony
Integration) packages to work smoothly and efficiently, often
logging the callers number.
Channel bonding
The ISDN protocol allows multiple channels to bond together.
Especially useful for video-conferencing and internet access
where faster data transfer rates are required. For example,
you can bond 2 x 64K channels into 1 X 128 K circuit for faster
internet access than a standard 56K modem.
Protocols
There are two main ISDN products; Basic rate (ISDN2) which
is two 64k channels and Primary Rate (ISDN30) which has two
main protocols; DASS II a coax presented system and ETSI or
I421 also known as Q931 Euro ISDN. presented on a modular
RJ45 connector each of which can carry upto thirty 64k channels.
The main differences between the circuits are that DASS II
although allowing both DDI and non DDI channels on the same
circuit will not permit the outgoing CLI information to differ
from that of the main number. For example, a customer may
have a DASS II ISDN 30 circuit with DDI numbers 01234 567800
through to 567839 and although an incoming DDI number to a
user may be 567834 the outgoing CLI will be 567800. ETSI would
allow the correct number to be transmitted.
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