Envoy Configuration and Management Manual

Introduction to Envoy
Envoy Configuration and Management Manual—429861-001
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Half-Duplex and Full-Duplex Lines
Besides being either half-duplex or full-duplex, communications are affected by logical
states that enable either two-way alternate or two-way simultaneous transmission. Two-
way alternate transmission can occur over either half-duplex or full-duplex lines; the
protocol never attempts to transmit simultaneously in both directions. Two-way
simultaneous transmission can occur only over full-duplex lines; the protocol transmits
simultaneously in both directions whenever appropriate. Envoy supports both two-way
alternate and two-way simultaneous transmission.
Figure 2-6. Full-Duplex Lines
009CDT .CDD
Send
Receive