ADSL (Asymmetric Digital Subscriber
‘A new technology that allows more date to be sent to over existing
copper telephone lines (POTS). ADSL supports data rates from 1.5 to
9 mbps when receiving data (know as the downstream rate). ADSL requires
a special ADSL modem. It is not currently available to the general public
except in trial areas, but many believe that it will be one of the more
popular choices for Internet access over the next few yearsâ€™.
A signal which can vary continuously, taking any value between certain
limits. The human voice, for which the public telephone network is designed,
is an analogue signal varying in frequency and volume.in distinctions
between POTS and non-POTS services are speed and bandwidth. The POTS
network is also called the public switched telephone network (PSTN).
Europea 1. European equivalent to T1 (but higher bandwidth). Also sometimes
written as E-1.
PRI:(Primary Rate Interface):
The primary rate interface in ISDN is 23B + D, for the North American
standard (T1), and 30B = D for the European standard (E1).
PSTN (Public Switched Telephone Network):
A series of public dial up analog telephone circuits available for voice
calls, and data transmission via a modem.
ISDN based protocol for signalling between nodes of a private intergrated
services network, allows products from different vendors to work together.
A protocol based closely on internationally agreed standards for ISDN.
Both QSIG and DPNSS support similar sets of features.
In telephony, signalling refers to the process and the standards involved
in passing control information between terminal equipment on the network
e.g. between a PABX and a local exchange, or between networked PABX's.
Software application emulating the functionality of a standard feature-rich
IP phone, operating on a desktop PC platform enabling voice calls to
be conducted across IP networks using the PC as an end point.
SDSL (Symmetric Digital Subscriber
A new technology that allows more data to be sent over existing copper
telephone lines (POTS), supporting data rates up to 3 Mbps. This works
by sending digital pulses in the high frequency area of telephone wires,
not used by normal voice communications, so can operate simultaneously
with voice connections over the same wires. SDSL requires a special
The common name for the mainly American digital 1.544 Mbps service.
Also sometimes written as T-1.
Terminal Equipment side of a digital signalling scheme.
Virtual Private Network:
The ability to create a secure private virtual link through a public
WAN (Wide area network):
To be distinguished from the LAN, a WAN interconnects geographically
10 base T:
10 Mbps LAN using twisted pair connectivity e.g. using standard CAT5
100 Mbps LAN using twisted pair connectivity e.g. using standard CAT5
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