Port Features
Page 72 7750 SR Interface Configuration Guide
Working and protection circuits can be connected to a variety of types of network elements
(ADMs, DACSes, ATM switches, routers) and serve as an access or network port providing one or
more services or network interfaces to the router. APS-protected SONET/SDH ports may be
further channelized, and may contain bundled channels MLPPP or IMA Bundle Protection
Groups). The ports may be one of a variety of encapsulation types as supported by the MDA
including PPP, ATM, FR and more. For a definitive description of the MDAs, port types,
switching modes, bundles and encapsulations supported with APS see APS Applicability,
Restrictions and Interactions on page 90.
This section discusses the different APS architectures and their implementations.
• Single Chassis and Multi-Chassis APS on page 73
• APS Switching Modes on page 76
• APS Channel and SONET Header K Bytes on page 80
• Revertive Switching on page 84
• Bidirectional 1+1 Switchover Operation Example on page 84
• Protection of Upper Layer Protocols and Services on page 86
• APS User-Initiated Requests on page 87
• APS and SNMP on page 89
• APS Applicability, Restrictions and Interactions on page 90
• Sample APS Applications on page 94
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