458x GPS-OCXO based solution by Oscilloquartz is the number one set OEM products and provide the highest capabilities for high performance reference when state of the art stability, accuracy and redundancy are needed at a minimum price.
OSA OEM 458x offers numerous variants to be used in a single channel / dual channel redundant configuration. The product family is highly versatile and adapts to customer integration requirements: dimension of the board, number/type/frequency of output signals, custom back-plane connectors and front panel, custom management protocol.
The operating and monitoring parameters of the instrument are accessible for read and write operations through the internal interface RS-485 and through the local RS-232C.
TD-SCDMA (Time Division Synchronous Code Division Multiple Access), among other UMTS 3rd Generation such as W-CDMA, requires highly stable frequency & phase references to synchronise (phase) and syntonise (frequency) each Node B/BTS of the mobile network.
Meeting such stringent specifications requires the implementation of a GPS driven frequency & phase reference that generates signals with frequency accuracy better than 1x10-11 and phase-time accuracy better than 100 ns.
In macro BTS, dedicated to high density areas, “phase jump-less” redundancy is a must to achieve high efficiency.
Moreover, frequency and time references must exhibit high holdover performance, typically # 7 µs over three days of free running BTS/B node.
Thanks to the very high performance of 8663 oscillator, OSA-OEM 458x receivers provide very high frequency stability (ADEV(τ) < 1x0-11 from τ = 1s to τ = 1000 s) and highly stable timing signal (typ less than +/- 25 ns) . By design, the OSA OEM 458x board is built as a 1+1 fully redundant, self calibrating, hot swappable unit. Oscilloquartz expertise in the design of synchronization equipments for transport networks (SONET, SDH) where redundancy is a must ensures that OSA-OEM 458x boards provide channel switch-over phase jumps of less than 5 ns.
A passive back plane is available to provide the 1+1 redundancy / hot swappable capability where each GPS board acts as a plug and play unit.
The OSA OEM 458x board provides a set of timing signals on various outputs (PP2S, TOD on RS 485, 10MHz …) phase aligned within less than 5 ns, providing time accurate reference signals better than 100ns from UTC. Other timing signal (12.5 Hz, specific frequency aligned on PP2S) are available.
In case of failure of incoming GPS signal (bad weather conditions, destruction of GPS antenna..), the high performance oscillator ensures that the OEM unit is able to provide frequency and timing holdover references better than 7 µs over 24 hours.
Information
Thanks to the very high performance of 8663 oscillator, OSA-OEM 458x receivers provide very high frequency stability (ADEV(τ) < 1x0-11 from τ = 1s to τ = 1000 s) and highly stable timing signal (typ less than +/- 25 ns) . By design, the OSA OEM 458x board is built as a 1+1 fully redundant, self calibrating, hot swappable unit. Oscilloquartz expertise in the design of synchronization equipments for transport networks (SONET, SDH) where redundancy is a must ensures that OSA-OEM 458x boards provide channel switch-over phase jumps of less than 5 ns. 
