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WAN; it does not define internal operation of the network, or the interfaces, or
protocols used within the WAN. For this reason, the term Frame Relay cloud
is often used to describe the internal operation of a WAN that has a Frame
Relay interface.
FTP
File Transport Protocol. A TCP/IP protocol for transferring files between
different systems. A method of retrieving files to a home directory or directly
to a computer using SLIP/PPP. There are thousands of FTP sites on the
Internet offering files and programs of all kinds.
GSM
Global System for Mobile Communication. The digital wireless-
transmission technique used in Europe and supported in North America for
Personal Communication Service. GSM uses 900 MHz and 1800 MHz in
Europe. In North America, GSM uses 1900 MHz.
HDLC
High-level Data Link Control. A popular ISO standard that is a bit-oriented,
link-layer protocol derived from Synchronous Data Link Control (SDLC).
HDLC specifies a method of encapsulating data on synchronous serial-data
links.
Hop
The transition between two networks via a router. The next hop is defined as
the IP address of the next router port encountered while traveling to a
destination IP (host). Cost is the number of routers encountered along a route
(series of hops) to a destination IP.
HSSI
High-speed Serial Interface. A network standard for high-speed (up to 52
Mbps) serial communications over WAN links.
Voyager Reference Guide
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