Specifications
Routing 
The process of selecting the most efficient circuit path for a 
message. 
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). 
Sync 
See Synchronous Transmission. 
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. 
T3 
A digital transmission link with a capacity of 45 Mbps, or 28 T1 lines. 
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. 
Throughput 
The amount of information transferred through the network 
between two users in a given period, usually measured in the 
number of packets per second (pps). 










