DSS Eurocom 612, Инструкция по установке и программированию

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I n s t a l l a t i o n & P r o g r a m m i n g M a n u a l
68
7. Glossary
0+2 / 1+2 / 2+2 expansion cards
The 0+2 expansion card refers to a card
which provides no exchanges lines and two
extensions. Similarly the 1+2 and 2+2 cards
provide 1 and 2 exchange lines respectively
and 2 extensions.
Basic Rate Access
Single ISDN access with two B channels and
one D-channel. The two B channels can
carry voice, and are used as exchange lines on
the telephone system.
BBU
Battery back-up unit. A separate unit that
allows the system to operate during a power
failure.
Call waiting
During a call a tone signals that there is
another call.
CDR
Call detail recording. This is a feature offered
by the system which can log all calls with
destination, duration, time, cost and
originator. It is referred to as SMDR by some
systems.
CLIP
Calling line identification presentation. If you
have ordered this from your carrier, you can
suppress the display of your telephone
number at the called party. For this system a
CLI card must be connected for analogue
lines or an ISDN card for ISDN line for the
CLIP feature to be active. The feature must
also be requested from the Telecom
provider.
CNG tone
Fax machines transmit a special tone at the
start of a call so that other equipment knows
it is for a fax machine. The system is able to
transfer calls to a fax extension when it
detects fax CNG tone.
COLP
Connected line presentation. This shows the
calling party your telephone number, if
different from the dialled number. This is
relevant in the case of MSN numbering. This
service is available on ISDN lines only.
DDI
Direct dialling inward. This is an ISDN
service similar to MSN. It allows a single
ISDN line to have many telephone numbers.
DISA
Direct Inward Station Access. This allows
you to dial into the telephone system direct
to an extension on an external number
without needing an operator to manually
answer the call first.
DTMF
Dual-tone, multi-frequency. This is the name
given to the tones used by phones to dial
numbers or access network services.
Exchange
Node in public telecommunications network.
Often also referred to as Central Office.
Your external telephone line is connected to
the telephone network through equipment in
the local exchange.
Flash
A flash is a short break in the line. It is
detected by the system to activate certain
features during a call and can also be sent to
the exchange line to activate network
services. Often called recall.
Hotline
A Hotline is an extension that dials a number
automatically whenever the extension is
taken off-hook.
ISDN
ISDN stands for Integrated Services Digital
Network. Compare with PSTN.