Alcatel-Lucent 7750 Configuration Manual page 59

LCP
The Link Control Protocol (LCP) is used to establish the connection through an exchange of
configure packets. This exchange is complete, and the LCP opened state entered, once a
Configure-Ack packet has been both sent and received.
LCP allows for the negotiation of multiple options in a PPP session. MLPPP is somewhat different
than PPP and therefore the following options are set for MLPPPP and not negotiated:
Any non-LCP packets received during this phase must be silently discarded.
7750 SR Interface Configuration Guide
→ No async control character map
→ No link quality monitoring
→ No compound frames
→ No self-describing-padding
Interface Configuration
Page 59