DS0 Streaming Server streams DS0 timeslots over Ethernet

Typical usage of the DS0 Server might include monitoring of the VoIP control signals sent over particular timeslots on a centralized workstation. Once the control signals indicate a specific timeslot to be of interest for detailed monitoring, the central workstation can request the DS0 Server to start streaming the specific timeslot to a different workstation for further processing. Because of the 60 second buffer, the centralized workstation can take awhile to decide that a channel needs need further monitoring, and can then request that the timeslot be forwarded starting from the moment of the control signal.

The DS0 Server can stream the complete timeslot contents from a single channel, or from a set of strapped channels within a single E1, or even the contents of a set of strapped channels multiplexed across several E1s. The unit can send the data in either raw timeslot form or can implement the A-law translation before sending. The unit also supports filtering of PPC or HDLC data from the individual or strapped timeslots, so that the client workstation need only receive actual digital packets.

Within the unit, each of 16 E1 streams are terminated in a 120 ohm transformer connection. The individual E1 streams have their data and clock recovered, and the clocked bits are sent into an FPGA that performs channel framing and storage to the local memory. All channel data is stored to the memory, which is sized large enough to hold at least 60 seconds of historical data. A local processor monitors the Ethernet link using TCP/IP, awaiting user requests to turn on or turn off streaming of timeslots to client workstations. This processor also handles the TCP/IP interface for up to 512 separate streaming sockets - each of the 512 DS0 timeslots can be sent to a different computer over the common Ethernet line! Or a single DS0 timeslot can be streamed to 512 workstations.

Each unit has a 50 pin connector in the rear for bringing in the 16 line pairs of E1 input, and has an RJ-45 connector in the rear for connecting of Ethernet. LEDs on the front panel indicate which E1s have data present, and which E1s also have frame lock.

Production units of the DS0 Streaming Server will be available in Q3/Q4 2004, with single unit cost of $3950 (discounting for larger quantities). Please contact Steven Ahlport for further information.

Last modified: 3 December 2003
Pacific Custom Systems, Inc.