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Glossary
118 EN/LZT 108 6492 R2 - October 2003
16 Glossary
- A -
ADSL
Short for Asymmetric Digital Subscriber Line. A variation of the DSL
technologies that is most familiar to home and small business users. ADSL
is called "asymmetric" because most of its two-way or duplex bandwidth is
devoted to the downstream direction, sending data to the user. Only a small
portion of bandwidth is available for upstream or user-interaction
messages.
ARP
Short for Address Resolution Protocol, a TCP/IP protocol used to convert
an IP address into a physical address, such as an Ethernet address. A host
wishing to obtain a physical address broadcasts an ARP request onto the
TCP/IP network. The host on the network that has the IP address in the
request then replies with its physical hardware address.
There is also Reverse ARP (RARP) which can be used by a host to
discover its IP address. In this case, the host broadcasts its physical
address and a RARP server replies with the host’s IP address.
ATM
Short for Asynchronous Transfer Mode, a network technology based on
transferring data in cells or packets of a fixed size. The cell used with ATM
is relatively small compared to units used with older technologies. The
small, constant cell size allows ATM equipment to transmit video, audio,
and computer data over the same network, and assure that no single type
of data hogs the line.
Authenticate
To verify a user’s identity, such as by prompting for a password.
- B -
Bridging
Passing data from your network to your ISP and vice versa using the
hardware addresses of the devices at each location. Bridging contrasts with
routing, which can add more intelligence to data transfers by using network
addresses instead. The HM210dp/di can perform both routing and bridging.
Typically, when both functions are enabled, the device routes IP data and
bridges all other types of data. See also Routing.