Envoy Configuration and Management Manual

Envoy Configuration and Management Manual—429861-001
2-1
2
Introduction to Envoy
The Envoy subsystem provides general-purpose protocol support that enables
application programs or terminals to communicate over communications lines on a
ServerNet wide area network (SWAN) concentrator.
Topics described in this section include the following:
•
Envoy Communications Interface on page 2-2
•
NonStop Himalaya S-Series Server Architecture on page 2-2
•
Protocols Supported on page 2-5
•
Point-to-Point Data Links on page 2-6
•
Multipoint Data Link on page 2-8
•
Half-Duplex and Full-Duplex Lines on page 2-10