External interfaces
• 2 QSFP cages each supporting 100 Gb/s link, 40 Gb/s link or 4×10 Gb/s link
• Optical connection through QSFP compatible optical modules
• 1 port electrical 10/100/1000BASE-T port (RJ-45 connector)
• 2 ports BITS interface: 1 port in, 1 port out, using ITU-T G.703 (ANSI interfaces available on separate GFC unit)
• ToD interfaces
• 1 port local craft management (LCM) interface using RS-232 (RJ-45 connector)
• 1 Alarm CutOff (ACO) button for alarm cut off and lamp test interfaces, for example, signaling and communication (ANSI ACO available on separate GFC unit)

Forwarding
• Ethernet bridging
• Virtual local area network (VLAN) stacking for residential and business access
• 802.3ad trunking: Link Aggregation Control Protocol (LACP)
• Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP) and Spanning Tree Protocol (STP) support
• MPLS
• L3 forwarding (IPv4 and IPv6)
• RIP v2, OSPF v2, BGP v4, IS-IS routing protocols
• Multicast forwarding, high performance Internet

Group Management Protocol (IGMP) processing
(incl. IGMP proxy) and MLDv1/v2
• IP Quality of Service (QoS)
• Dynamic Host Configuration Protocol (DHCP) relay, multiple instances
• Access control lists (ACL), denial of service (DoS) protection
• Malicious MAC-move protection
• Lawful intercept
• Hubbing support
• Ethernet ring connectivity (with ERPS support)
• Support for central broadband remote access server (BRAS)
• Point-to-Point Protocol (PPP) connectivity to single or multiple systems
• Up to 16,000 subscribers per system