Alcatel-Lucent 7750 SR OS Service Manual page 132

Pseudowire Redundancy
This application can make use of all types of VLL supported on the 7x50. A SAP can be
configured on SONET/SDH port which is part of an APS group. However, if a SAP is configured
on a MC-LAG instance, only the Epipe service type is allowed.
Page 132 7750 SR OS Services Guide