1 Annex A - G. 3 Annex A, Annex L, Annex M - G. 5 Annex A, Annex M The ZyXEL IES-612-51A/IES-612-51 is a 12-port ADSL2/2+ mini DSLAM. It has 2 Fast Ethernet (100Base-Tx) WAN ports that can be configured as uplinks or cascading ports. In order to support more than 12 subscribers, three network topologies can be constructed for different circumstances: Daisy Chain is the one with the minimum number of uplink connections; Loop structure is the topology where the single point failure issue can be avoided in the uplink connections with RSTP (IEEE 802. 1w) protocol; Tree structure is the most robust one where each IES612-51 has its own uplink connections. ATM Multi-paired Port Bonding (*) AC (100 V ~ 240 V) or DC (-36 V ~ -72 V) Power Input Easy Network Expansion for Subscriber Growth Sophisticated QoS Mechanism for Triple-play Services ADSL2+ Port-bonding for Higher Bandwidth in Longer Loops The IES-612-51A/IES-612-51 is equipped with ATM-based multi-paired bonding feature. Two physical ports can be bonded together as a group, while all upper-layer traffics of a group can be segmented and transmitted over the member ports. If one of the member ports fails, the conveyed traffic will be moved to the other port. When the failed port recovers, it will seamlessly return to the group and share the transmission of the upper-layer traffics. Within a bonded group, the underlying bit rates of the individual ports can be freely and independently changed by their respective PHY layer. The port-bonding feature not only provides higher bandwidth to subscribers, but also offers more reliable pipes for business applications...