Billion BiPAC 8500/8501/8520/8521 SHDSL (VPN) Firewall Bridge/ Router
SHDSL – BiPAC 8521
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.
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Chapter 4: Configuration