Billion Electric Company BiPAC 8501/8521 - Manual (Page 70)

Billion BiPAC 8500/8501/8520/8521 SHDSL (VPN) Firewall Bridge/ Router
Chapter 4: Configuration
66
SHDSL – BiPAC 8520
Standard 4-wired connection: the 4-wired handshaking procedure that is compliant with ITU-T
standard.
False 4-wired connection: This mode is used when 4-wired connection is disabled.