Communications carriers News
November 25, 2009
As frame relay, ATM and other legacy WAN architectures fade away, enterprises are moving toward hybrid WAN networks that consist of both Ethernet services and MPLS IP VPNs. It all depends on the nature of the enterprise and how much control it wants over WAN routing.
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ELF (extremely low frequency) refers to an electromagnetic field having a frequency much lower than the frequencies of signals typically used in communications. Continue Reading
A carrier signal is a transmitted electromagnetic pulse or wave at a steady base frequency of alternation on which information can be imposed by increasing signal strength, varying the base frequency, varying the wave phase, or other means... (Continued) Continue Reading
Carrier detect (see modem lights) is a control signal between a modem and a computer that indicates that the modem detects a "live" carrier that can be used for sending and receiving information. Continue Reading
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What is an E&M line? What is the difference between a 2 wire and 4 wire E&M? Continue Reading