Specifications

Single Mode
Describing an optical wave-guide or fiber that is designed to
propagate light of only a single wavelength (typically 5-10 microns
in diameter).
Space
In telecommunications, the absence of a signal. Equivalent to a
binary 0.
Sync
See Synchronous Transmission.
Synchronous
Transmission
Transmission in which data bits are sent at a fixed rate, with the
transmitter and receiver synchronized.
T1
A digital transmission link with a capacity of 1.544 Mbps used in
North America. Typically channelized into 24 DS0s, each capable of
carrying a single voice conversation or data stream. Uses two pairs
of twisted pair wires.
Telnet
The virtual terminal protocol in the Internet suite of protocols. It
lets users on one host access another host and work as terminal
users of that remote host. Instead of dialing into the computer,
the user connects to it over the Internet using Telnet. When
issuing a Telnet session, it connects to the Telnet host and logs in.
The connection enables the user to work with the remote machine
as though a terminal was connected to it.
Timeslot
A portion of a serial multiplex of timeslot information dedicated to
a single channel. In E1 and T1, one timeslot typically represents
one 64 kbps channel.