Instant Messaging and Presence Protocol (IMPP)

See IMPP.

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• download
• downstream
• downtime
• DPCM (Differential Pulse Code Modulation)
• DPLC (Digital Port Line Charge)
• DPSK (Differential Phase Shift Keying)
• DQDB (Distributed Queue Dual Bus)
• DQPSK (Differential Quaternary Phase Shift Keying)
• Draft-Martini VPN
• drain wire
• driver
• drop
• drop wire
• dry
• dry copper pair
• DS-0 (Digital Signal Level Zero)
• DS-0 (Digital Signal Level Zero)
• DS-1C (Digital Signal Level One Concatenated)
• DS-1 (Digital Signal Level One)
• DS-1 (Digital Signal Level One)
• DS-2 (Digital Signal Level Two)
• DS-3 (Digital Signal Level Three)
• DS-4 (Digital Signal Level Four)
• DS-5 (Digital Signal Level Five)
• DSA (Digital Switched Access)