TDM Pseudowire Access Gateway

RAD’s IPmux-216 TDM pseudowire access gateway extends TDM, HDLC and Ethernet services over packet switched networks. Incorporating a multi-standard pseudowire ASIC, it supports TDMoIP, CESoPSN, SAToP, and HDLCoPSN encapsulation with minimal processing delay. In addition to its high port count, the IPmux-216 TDM pseudowire access gateway provides carrier-class performance with comprehensive OAM and quality of service functionalities, as well as high-precision clock recovery that meets cellular backhaul requirements.

• Enables legacy service continuity over packet transport with comprehensive pseudowire support

• Provides economical alternative for costly leased lines using existing customer equipment

• Reduces enterprise IT expenses on PSTN connectivity

• Ensures TDM service quality with low latency, minimal packet loss and configurable jitter buffer

• Enhances performance with increased pseudowire capacity and service management capabilities

The IPmux-216 TDM pseudowire access gateway enables carriers to extend their services from legacy backbones over greenfield packet networks, without affecting customer experience or replacing existing end-user equipment. It 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.

 

IPmux-216's high port count makes it ideal for central POPs as well as for transport providers serving several mobile operators from shared towers.

Incorporating RAD’s new generation of ASIC processors, the IPmux-216 features enhanced pseudowire performance with minimal processing delay, including support for all standard TDM circuit emulation modes, such as TDMoIP, CESoPSN, SAToP and HDLCoPSN. Featuring a 256-circuit pseudowire capacity, the IPmux-216 enables each timeslot to be assigned a separately configured pseudowire connection, thereby supporting multiple PW flavors simultaneously. By grooming DS0-level bundles, the IPmux-216 also facilitates an efficient use of the expensive TDM ports.

The IPmux-216 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-216 can accurately regenerate an original clock transmission in varying network load conditions. The IPmux-216 conforms to ITU-T G.823/G.824 synchronization interface requirements and to G.8261-defined scenarios, providing low latency, attenuating delay variations and enabling service resiliency. A user-configurable jitter buffer compensates for packet delay variation of up to 180 msec in the network. Such high precision clocking attributes provide a frequency accuracy level of 16 ppb, guaranteeing smooth operation of 2G and 3G cellular equipment over PSNs.

The IPmux-216 includes an internal Ethernet bridge, operating in either VLAN-aware or VLAN-unaware mode. VLAN stacking (Q-in-Q) allows traffic separation between different users or services. Supporting Ethernet private line (EPL) service provisioning, the IPmux-216 TDM pseudowire access gateway 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.

The IPmux-216 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.

The IPmux-216 TDM pseudowire access gateway 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-216 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) and RADIUS.