Interface Configuration
7750 SR Interface Configuration Guide Page 73
Single Chassis and Multi-Chassis APS
APS can operate in a single chassis configuration (SC-APS) or in a multi-chassis configuration
(MC-APS).
An SC-APS group can span multiple ports, MDAs or IOMs within a single node whereas as MC-
APS can span two separate nodes.
The support of SC-APS and MC-APS depends on switching modes, MDAs, port types and
encaps. 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.
Table 16: SC-APS versus MC-APS Protection
Single Chassis
APS
Multi-Chassis
APS
Short form name SC-APS MC-APS
Link failure protection (including intermediate
transmission equipment failure)
Yes Yes
Optical/electrical module (SPF, XPF) failure
protection
Yes Yes
MDA failure protection Yes Yes
IOM failure protection Yes Yes
Node failure protection No Yes
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