TDM Pseudowire Access Gateway

• Incorporates a multi-standard TDM pseudowire ASIC processor supporting all TDM pseudowire modes
  
• Four channelized TDM user ports aggregating multiple fractional E1/T1s
  
• Up to three, SFP- or UTP-based Fast Ethernet or Gigabit Ethernet network ports with uplink redundancy
  
• Cross connect between E1 or T1 ports (without signaling)
  
• Up to 64, individually-configured pseudowire connections supports a large number of remote units
  
• DS0-level grooming
  
• Under 16 ppb frequency accuracy with advanced clock recovery per G.823/824 synchronization interface and G.8261 specifications
  
• MEF (Metro Ethernet Forum)-9 and MEF-14 certified for Ethernet private line (EPL) service with port-based rate limitation
  
• Traffic classification according to 802.1p, IP ToS/DSCP or MPLS EXP bits
  
• 802.1Q Ethernet bridging; VLAN tagging and stacking (Q-in-Q)
  
• Enhanced fault management capabilities including alarm propagation, diagnostic loopbacks, and fault isolation
• SNMP management; Centralized RADIUS authentication, secure Telnet and Web access (SSHv2, SSL)

• Enables legacy service continuity over packet switched networks
  
• Promotes CapEx savings by supporting all TDM pseudowire standards in a single device
  
• Reduces OpEx by minimizing the number of leased lines required for network access
  
• Supports legacy PBX, including proprietary features and signaling
  
• Supports TDM service performance requirements by ensuring low latency and minimizing packet loss and jitter
  
• Enables migration of cellular services to next-generation networks by allowing delivery of 2G/3G traffic over packet transport
  
• Enhances performance with increased pseudowire capacity and service management capabilities

The IPmux-24 TDM pseudowire access gateway transparently delivers framed or unframed, E1 or T1 signals, HDLC-based data streams, and user LAN traffic over packet-switched networks, via copper or fiber Fast Ethernet uplinks.

The IPmux-24 works opposite other pseudowire gateway units in remote locations, or opposite the Gmux-2000 hub-site pseudowire access gateway in central locations and POPs, to converge voice and data traffic over packet transport while maintaining first-rate service quality. Its compact design, ease of installation, and advanced traffic management capabilities enable carriers to extend their services from legacy backbones over Greenfield packet networks without affecting customer experience or replacing existing end-user equipment. The IPmux-24 also allows service providers to add traditional leased line services to their Layer 2 portfolio, and permits enterprises to reduce their IT expenses on PSTN connectivity and branch-to-branch communications. In addition, it supports cellular operators in migrating their services to economical packet-switched backhaul.

Advanced pseudowire functionality

Introducing RAD’s new generation of ASIC processors, the IPmux-24 features enhanced pseudowire (PW) performance with minimal processing delay, including support for all standard TDM circuit emulation modes, such as TDMoIP, CESoPSN, SAToP, and HDLCoPSN. A 64-pseudowire capacity enables each timeslot to be assigned a separately-configured pseudowire connection, thereby supporting multiple PW flavors simultaneously. By grooming DS0-level bundles, the IPmux-24 also facilitates an efficient use of the expensive TDM ports.

Clock recovery and timing

The IPmux-24 TDM pseudowire access gateway ensures end-to-end timing accuracy for real-time services across non-deterministic packet networks. Featuring adaptive clock recovery (ACR) capabilities, a remote IPmux-24 can accurately regenerate an original clock transmission in varying network load conditions. The IPmux-24 conforms to ITU-T G.823/G.824 traffic and synchronization interface requirements and to G.8261 defined scenarios, providing low latency, attenuating delay variations and enabling service resiliency. Such high precision clocking attributes provide a frequency accuracy level of 16 ppb, guaranteeing a smooth operation of 2G and 3G cellular equipment over PSNs.

Ethernet QoS capabilities

The IPmux-24 includes an internal Ethernet bridge, operating in either VLAN-aware or VLAN-unaware mode. VLAN stacking allows traffic separation between different users or services, by defining a service provider VLAN ID per customer or service. Supporting Ethernet private line (EPL) service provisioning per MEF-9 and MEF-14 specifications, the IPmux-24 also includes enhanced traffic engineering and CIR/CBS rate limitation features, thereby enabling service providers to granularly adjust bandwidth to fit capacity requirements. SLA enforcement and QoS guarantees are supported by four strict priority queues, classified by VLAN tags, per port 802.1p bits, IP Precedence, or ToS/DSCP bits.

OAM and diagnostics

The IPmux-24 incorporates a pseudowire OAM mechanism that enables end-to-end monitoring of the pseudowire link, performing connectivity verification and round-trip delay measurements, as well as preventing pseudowire configuration errors. Diagnostic loopbacks can be remotely activated, while network condition statistics for the LAN and IP layers are also monitored and stored by the device. Performance monitoring parameters include packet loss, packet mismatch and packet delay variation.

Service center management and security

The IPmux-24 features flexible management capabilities, including local management via an ASCII terminal (RS-232). In addition, remote management can be performed either inband or out-of-band, using the network or user ports, while maintaining separation between management and user traffic via the use of VLANs. Advanced FCAPS (Fault, Configuration, Accounting, Performance, Security), service provisioning and diagnostic tools are provided by RADview-SC/TDMoIP, RAD’s network management system, via an SNMP-based GUI.

The IPmux-24 also supports a variety of configuration access channels, including Telnet, SNMP, Web server, and TFTP. Incorporated security features include Secure Shell (SSH), Web-based Secure Socket Layer (SSL), SNMPv3, and RADIUS.