Hub-Site Pseudowire Access Gateway

• Four Gigabit Ethernet combo UTP/SFP network ports
• TDM interfaces: 1+1 Redundant Channelized STM-1 or 32 E1
• 32 UTP or SFP Fast Ethernet user ports
• Multi-standard pseudowire encapsulation: SAToP, CESoPSN, TDMoIP, UDP/IP, MPLS, ETHoPSN (MEF-8)
• Gigabit Ethernet redundancy: Ethernet Ring Protection Switching (ERPS) per ITU-T G.8032, Link Aggregation (LAG/LACP)per IEEE802.3ad
• VLAN-aware or VLAN-unaware bridging; VLAN stacking(“Q-in-Q”)
• Ethernet QoS with four priority queues
• Ethernet Link OAM based on 802.3ah (IEEE802.3-2005), PWE OAM
• SDH APS (1+1) support
• 1U (STM-1) or 2U (E1), 19" enclosure with redundant power supply and fans

• Economical, high density gateway for extending TDM and Fast Ethernet services over Gigabit Ethernet and channelized STM-1 transport
• Helps carriers migrate their customers to packet transport by supporting existing user equipment
• Allows enterprises, utility companies and government agencies to save on leased-line costs by transporting STM-1 traffic over PSN
• Reduces PoP/CO costs by combining high-density pseudowire aggregation with Ethernet switch functionalities

RAD’s IPmux-155L hub-site pseudowire access gateway transports TDM and Ethernet traffic over PSN and SDH access with carrier-grade quality and service protection. The 19-inch enclosure is typically used by the following:

• Incumbent carriers wishing to migrate to packet infrastructure
• Alternative carriers offering legacy leased-line services over packet networks
• Enterprises, utilities, government and public institutions wishing to save on leased-line expenses
• Wholesale transport providers servicing 2G and 3G mobile operators

Advanced pseudowire functionality

The IPmux-155L features enhanced pseudowire performance with minimal processing delay, allowing the extension of TDM services from legacy backbones over greenfield packet networks without affecting service quality or user experience. The IPmux-155L supports separate configuration for up to 480 pseudowire connections. Configurable packet size balances PSN throughput and delay, while a jitter buffer compensates for packet delay variation (jitter) of up to 200 msec in the network.

Timing and synchronization

The IPmux-155L TDM pseudowire gateway supports various clocking options, using external and internal timing signals to ensure synchronization as any standard TDM device:

• SDH clock (8 kHz)
• 2.048 MHz clock recovered from a PWE flow, E1 line or GbE port (Sync-E)
• External station clock source via station clock port, providing out-of-band synchronization

The system clock uses master and fallback timing sources for clock redundancy. IPmux-155L also provides system clock input and output via an external clock port. Adaptive clock recovery conforms to G.823 traffic interface.

Ethernet capabilities

The IPmux-155L’s Ethernet attributes include port-based VLAN membership and VLAN tagging, as well as VLAN stacking (Q-in-Q). In addition, it supports port-based rate limitation per granular committed information rate (CIR) and committed burst size (CBS), enabling the total transmitted bandwidth to be adapted to the limitations of the transport media.

The IPmux-155L also enables network operators to monitor and troubleshoot Ethernet links. The OAM mechanism operates according to IEEE 802.3ah requirements for fault indication and loopback activation response.