NationMaster - Encyclopedia: TTL

Transistor-transistor logic - Wikipedia, the free encyclopedia (930 words)
	TTL became popular with electronic systems designers in 1962 after Texas Instruments introduced the 7400 series of ICs, which had a wide range of digital logic block functions.
	TTL became important because it was the first time that low-cost integrated circuits made digital techniques economically practical for tasks previously done by analog methods.
	TTL was historically considered significantly less sensitive to damage from electrostatic discharge than CMOS, although current CMOS designs now exhibit less static sensitivity than earlier designs.

RFC 3682 (rfc3682) - The Generalized TTL Security Mechanism (GTSM) (2330 words)
	The TTL must either be 255 (for a directly connected peer), or 255-(configured- range-of-acceptable-hops) for a multi-hop peer.
	TTL (Hop Limit) Spoofing The approach described here is based on the observation that a TTL (or Hop Limit) value of 255 is non-trivial to spoof, since as the packet passes through routers towards the destination, the TTL is decremented by one.
	Tunneled Packets An exception to the observation that a packet with TTL of 255 is difficult to spoof occurs when a protocol packet is tunneled to a decapsulator who then forwards the packet to a directly connected protocol peer.

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