| A thru H |
Definition of Terms 
|
| ASSP |
Application Specific Standard Product |
| DSL |
Digital Subscriber Line |
| FCS |
Frame Check Sequence |
| HDLC |
High-level Data Link Control. It is a bit-oriented synchronous data
link layer protocol developed by the ISO. It specifies
a data encapsulation method on synchronous serial links using frame characters
and checksums. |
| HDLC Controllers |
These are devices which perform the HDLC protocol. Some of the key
operations include handling bit oriented protocol structure and formatting
data as per packet switching protocol defined in the X.25
recommendations of the CCITT. It includes transmitting and receiving
the packeted data serially, while providing the data transparency through
zero insertion and deletion. These controllers generate and detect
flags that indicate the HDLC status. They provide 16-/32-bit CRC on data
packets using the CCITT defined polynomial, and recognize the single byte
address in the received frame. |
| HSSI |
High Speed Serial Interface |
| I thru Z |
|
| ISDN |
ISDN (Integrated Services Digital Network) is a high-speed, fully digital
telephone service. Just as compact discs have made recorded music digital,
ISDN upgrades today's analog telephone network to a digital system. ISDN
can operate at speeds up to 128 kilobits/second, which is five or more
times faster than today's analog modems. ISDN can dramatically speed up
transfer of information over the Internet or over a remote LAN connection,
especially rich media like graphics, audio or video or applications that
normally run at LAN speeds. |
| ISO |
International Standards Organization |
| OSI Reference Model |
The Open Systems Interconnection Reference Model
is defined by the
ISO and describes data communication
services and protocols. The ISO OSI Reference Model consists of seven layers,
each of which specifies particular network functions that allow heterogenious
applications, data, hardware, etc. to function as seemless network. |
| PPP |
Point-to-Point Protocol |
| SDLC |
Synchronous Data Link Control |
| SONET |
SONET stands for Synchronous Optical NETwork. The SONET format allows
different types of formats to be transmitted on one line. SONET is a long
term solution for a mid-span-meet between vendors. The other major advantage
is that SONET allows ADDING and DROPING signals with a single multiplexer. |
| X.25 |
An X.25 network is one in which packets of data are moved to their
destination along routes determined by network conditions as perceived
by routers, and reassembled in the right order at the ultimate destination. |
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