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Joint Product Development : VoIP Switch Line Card

The Project was to design and develop a high speed T1/T3 line card for a carrier class VoIP Switch. It included board design, firmware and test jig development.

Client Profile
A global telecommunications equipment manufacturer.

Description
The DS3 Rear Transition Board (RTB) was designed for a carrier class VoIP switch. The RTB has T1/T3 interfaces and 100MB ethernet PHY interface on board, and interfaces with the front board through cPCI connector. Salient product features are:

	RTB conversion of the T3 input to DS0 output and vice versa
	Conversion of DS0 input to H.110 type output format with seven serial inputs and seven serial outputs
	Serial EEPROM on the I2C bus stores configuration data.
	The front board feeds the power supply for the RTB (10W maximum from +3.3V and +5V combined)

Board features

	6U cPCI rear (80mm) plug-in board
	Size 233 x 160 mm
	6 layers

Salient Tata Elxsi Solution Features

	Board design and PCB layout.
	Firmware development
		Initialization of all devices on RTB
		POST and diagnostics of CPLD, serial EEPROM, protection circuit, 100MB Ethernet PHY, T3 LIU, PM8315 on RTB as a standalone process to integrate into and run on swallow front card processor code.
		All drivers and library functions
	Test jig development (menu driven test program) using a Xilinx CPLD that acts as a bus translator between ISA/EISA add-on card and RTB local bus interfaces.

Tools used

	Mentor Board Station
	Logic analyzer and test equipment for the Gigabit card

Key Customer Value
Cost Effective solution and faster time to market leveraging Tata Elxsi proficiency in hardware design.


	Partnerships

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