Alcatel-Lucent 7710 SR SONET, Configuration Manual

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Interface Configuration
7710 SR OS Interface Configuration Guide Page 57
Note that “facility” in the SR-OS context refers to the physical line (including intermediate
transport/switching equipment) and directly attached line terminating hardware (e.g. SFP module,
MDA and IOM). “Circuit” is also a term used for a link/facility (e.g. working-circuit).
A 1+1 APS group contains two circuits.
APS is configured on a port by port basis. If all ports on an MDA or IOM need to be protected
then each port on the MDA or IOM must be individually added into an APS group.
Working and protection circuits can be connected to a variety of types of network elements (e.g.
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 (e.g. 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 please see
APS Applicability,
Restrictions and Interactions on page 50 .
This section discusses the different APS architectures and their implementations.
• Single Chassis and Multi-Chassis APS on page 34
• APS Switching Modes on page 37
• APS Channel and SONET Header K Bytes on page 41
• Revertive Switching on page 45
• Bidirectional 1+1 Switchover Operation Example on page 45
• Protection of Upper Layer Protocols and Services on page 46
• APS User-Initiated Requests on page 47
• APS and SNMP on page 49
• APS Applicability, Restrictions and Interactions on page 50
• Sample APS Applications on page 54