Black Box LRA005A-R2 - Manual (Page 125)

ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER USER’S MANUAL
125
socket—An IP socket is created when an IP port on a host machine makes a connection to an IP port on
a client machine. IP sockets are ephemeral by nature. When a standard request port has formed a socket
connection to a standard services port, additional requests for access to that port may be denied,
retiming the “Socket request denied” error message, which is often seen when attempting connections
to popular Internet WWW host sites.
SPID—Service profile identification. An additional identification number used along with the local
directory number on some North American ISDN lines. This number and its local directory number
must be programmed into the ISDN equipment so the equipment can register the numbers with the
Central Office ISDN switch whenever they are running.
SPX—Sequenced packet exchange. The guaranteed-delivery version of IPX from Novell.
subnet—For routing purposes, IP networks can be divided into logical subnets by using a subnet mask.
Values below those of the mask are valid addresses on the subnet.
switched service—Also known as switched-56 service. This is a type of nonleased line.
synchronous—As in synchronous serial lines, refers to a mode of data transmission in which a clock
signal (or embedded clock) is used to coordinate sender and receiver.
TA—terminal adapter. An end-user device on the ISDN. Used to interface the Router (and similar
devices) to an ISDN line. The terminal adapter can be a conversion device to connect a non-lSDN device
(analog telephone) to the ISDN.
TCP—transmission control protocol. Responsible for packet reception verification, data integrity, packet
sequencing and maintaining connections. Provides sequenced and verified transmission of messages
between systems. TCP is part of the TCP/IP protocol suite, and often is used to link UNIX-based LANs.
TCP/IP—transmission control protocol/internet protocol. A standard for communicating among different
computer systems. The computer systems may have different operating systems and hardware.
telnet—A utility that emulates a terminal on a network as though it were a console directly connected to
the Router. It enables users to log into a remote system directly from a local terminal and local login
session. With telnet, the user can conduct a session and run application programs as if the user’s
terminal were directly connected to the host. Telnet requires the use of TCP/IP.
transparent access—When a remote device or network appears to be a local node on the LAN.
UDP—User datagram protocol, provides for user access to low overhead connectionless datagram
communications. UDP is part of the TCP/IP protocol suite.
U Interface—In North America, the U Interface is a reference point between an NT1 and a digital
subscriber line.
uudecode—UNIX-to-UNIX decode allows binary files that have been uuencoded into ASCII text files to
be translated back into binary files.
uuencode—UNIX-to-UNIX encode allows binary files to be translated into pure ASCII text files,
permitting them to be transmitted as email through SMTP. It is widely used in the Internet’s USENET
email-based interest-group conferences.
V.32—Full-duplex 9600 bps over dial-up telephone lines with fallback to 4800 bps when line quality does
not allow 9600-bps operation.
V.32bis—Communication specification for data transfer speeds at full duplex to 14400-bps over dial-up
telephone lines with fallback to 12,200/9600/7200/4800 and full compatibility with V.32.