SFP-Format TDM Pseudowire Gateway

• Ensures TDM service quality over packet with advanced clock distribution mechanisms
• Reduces CapEx by providing a cost-effective alternative to standalone units or conversion cards
• Reduces OpEx by facilitating the use of economical packet transport instead of expensive leased lines
• Supports great savings in space, power consumption, and cabling
• Increases network flexibility by allowing quick, ad-hoc installations
• Interoperable with third-party TDM pseudowire gateways

Standard Pseudowire Encapsulation

The MiTOP-E1/T1 SFP-format TDM pseudowire gateway provides cost effective TDM circuit extension over PSN using standard pseudowire encapsulation. Supporting IETF RFC 5086 (CESoPSN) and IETF RFC 4553 (SAToP) standards, the device converts user data stream into packets for transmission over the network via a 100BaseFx port at the host device. It also supports UDP/IP, MPLS and MEF 8 (circuit emulation service over Metro Ethernet networks) addressing schemes. A pseudowire gateway at the remote site converts the packets back into TDM traffic.

In addition, the MiTOP-E1/T1 features high-performance, ASIC-based buffering and forwarding techniques for minimal end-to-end processing delay.

Pseudowire QoS/CoS

The MiTOP-E1/T1 supports quality of service classification and prioritization mechanisms for packet networks. These include 802.1Q VLAN IDs and 802.1p priority bits in Ethernet networks; ToS, DSCP and Diffserv in IP networks; and EXP bits in MPLS networks.

Synchronization over Packet

The MiTOP-E1/T1 employs advanced clock recovery and distribution mechanisms to ensure accurate synchronization over the packet network. Four clock modes are supported: Internal from a local oscillator; loopback timing derived from the TDM port’s receive clock; adaptive clock recovered from the packet network; and external clock provided by a dedicated PIN on the SFP edge connector.

Jitter and wander of the recovered clock conform to ITU-T G.823/G.824 Synchronization Interface specifications, using G.8261-defined scenarios. In addition, the MiTOP-E1/T1 maintains a large, configurable jitter buffer of up to 256ms to compensate for the packet delay variation (PDV) introduced by the packet network.

In addition, the MiTOP-E1/T1 features Synchronous Ethernet (Sync-E) support in its Gigabit Ethernet port. This ensures both sides of the network work with the same clock source.

Advanced Management Capabilities

The MiTOP-E1/T1 can be monitored, configured, and tested using the following ports and applications:

• Out-of-band management via an I2C interface
• Inband management via the Ethernet port using a Web browser

Management traffic can use a dedicated VLAN. The MiTOP-E1/T1 employs external and internal loopbacks to monitor TDM link connectivity. In addition, it enables WAN to LAN fault propagation alarms and link termination.

SFP Enclosure

Housed in a small form factor pluggable (SFP) enclosure, the MiTOP-E1/T1 operates on power derived from the host device, requiring no additional power supply. It can be installed on any switch or device that complies with multi-source agreement (MSA) specifications. The MiTOP-E1/T1 operates opposite other MiTOP devices installed in remote equipment. Alternatively, it can work opposite gateways that support standard CESoPSN and SAToP, such as RAD’s IPmux-24 TDM pseudowire gateway.