Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 63

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
Restrictions and Interactions on page
This section discusses the different APS architectures and their implementations.
•
•
•
•
•
•
•
•
•
•
7750 SR OS Interface Configuration Guide
Single Chassis and Multi-Chassis APS on page 64
APS Switching Modes on page 67
APS Channel and SONET Header K Bytes on page 71
Revertive Switching on page 75
Bidirectional 1+1 Switchover Operation Example on page 75
Protection of Upper Layer Protocols and Services on page 76
APS User-Initiated Requests on page 77
APS and SNMP on page 79
APS Applicability, Restrictions and Interactions on page 80
Sample APS Applications on page 84
80.
Interface Configuration
APS Applicability,
Page 63