Wintegra adds adaptive clock recovery access suite

Wintegra has announced that it has added adaptive clock recovery to its suite of multi-service access support.

According to the company, this proprietary algorithm enables the Wintegra PWE3 solution to meet the G.823 and G.824 jitter and wander masks in traffic conditions as defined by the Metro Ethernet Forum and G.8261-draft. It also meets the more stringent requirements of 3G applications. This opens new opportunities for using WinPath family products in Wireless Backhaul applications such as transport of T1/E1 (which connect NodeB/BTS to RNC/BSC) over Metro Ethernet and 2G/3G collocation, the company added.

Wintegra's new multi-service access solution supports termination of multiple protocols—including ATM UNI, IMA, PPP, ML-PPP, FR, MFR, CES and PWE3 (TDM, ATM, HDLC)—which can be used at the same time over different T1/E1 interfaces. Two solution densities are available, up to 16 T1/E1 (512 DS0 channels) using only external framers, and up to 336 T1/252 E1 (8,064 DS0 channels) using an external FPGA (for which Wintegra provides the IP core) and a framer/mapper.

Once the protocols are terminated, the data can be interworked to a cell or packet back-plane or uplink, either by using switching, bridging or MPLS routing. One of the newest protocols supported in the framework of this solution is pseudo wire emulation edge-to-edge (PWE3), that allows for the transport of different formats of data over packet networks.

When transporting TDM data over a packet network (in most cases using draft-ietf-pwe3-satop or draft-ietf-pwe3-cesopsn), the TDM timing information is lost. If there are no external means for synchronization, the TDM clock needs to be recovered from the arrival rate of the packets that transport the TDM data. This is a particularly challenging operation, considering the low jitter/wander requirements of T1/E1 clocks and the typical behavior of packet networks that includes large packet delay variations, lost packets and re-ordered packets.

The solution also meets the more restrictive requirements of TS-25.402 (Testing Synchronization in UMTS networks) which makes it suitable for 3G (and 2G) wireless applications.