NI Ettus OctoClock-G CDA-2990
8-Channel Clock Distribution Module with Integrated GPSDO
The OctoClock-G CDA-2990 is an affordable, high-accuracy timing reference and distribution system. This is a useful accessory for users that would like to build multi-channel systems that are synchronized to a common timing source. For example, the OctoClock-G CDA-2990 can be used to synchronize a system of USRP N210s for coherent operation. This can enable phased array applications such as beamforming, super-resolution direction-finding, diversity combining, or MIMO transceiver design.
The OctoClock-G CDA-2990 distributes 10 MHz and 1 PPS signals generated from an internal GPS-disciplined, oven-controlled oscillator (GPSDO), or an external source. The user can switch between these sources with a front-panel switch, and there is an automatic switch-over capability in case of failure or source disconnect.
The GPSDO serves as an accurate reference that can be synchronized to the GPS timing standard. This allows developers to time-align multi-channel systems across the globe within ~50 ns. When the GPSDO is not locked to the GPS constellation, it still provides 10 MHz/1 PPS signals, with an accuracy better than 25 ppb.

What's Included
- OctoClock-G CDA-2990
- Mounting Brackets
- Power Supply
Features
- Fully Integrated Timing Source with 8-Way Distribution (10 MHz and 1 PPS)
- Convenient Solution for Multi-Channel Synchronization
- Use with MIMO Capable N-Series Devices for Coherent System
- User Selection between Internal GPSDO or External 10 MHz/1 PPS Source
- Source detection with automatic switch over in case of failure or disconnect
- 19″ Rackmount – 1U
- Locking Power Supply Connector
Quickly find what you need to get started and reduce mean time to blink.
All product support including documentation, projects, and reference material can be accessed through Ettus resources.
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