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About the NWX
Part of CelAudio’s Reference Series, the NWX is designed for network-based music systems. It combines two internal switch modules with a shared precision clock architecture, providing connections for music servers, streamers and upstream networking equipment.
Four RJ45 ports and four SFP interfaces accommodate copper Ethernet, compatible optical modules and supported direct-attach connections. Four separate 10 MHz clock outputs allow the NWX to supply a reference to compatible external components.
Individually Powered Ethernet Interfaces
Each RJ45 port uses its own PHY—the physical-layer transceiver responsible for transmitting and receiving Ethernet signals.
Every PHY has an independent power supply and a dedicated clock input. This allows CelAudio to address power delivery and clock distribution at the individual interface level.
The two switch modules use industrial and carrier-grade components, selected to operate across a wide temperature range.
Dual-OCXO Clock Architecture
The NWX contains two oven-controlled crystal oscillators within a single shielded clock module.
A 10 MHz OCXO provides the reference, while a separate 50 MHz OCXO serves the CelCLK II PLL clock system. The PLL uses a narrow 1 Hz locking bandwidth.
CelAudio specifies the 10 MHz oscillator at −120 dBc/Hz phase noise at a 1 Hz offset, with an Allan deviation of 8 × 10⁻¹³ at a one-second averaging interval. The 50 MHz oscillator is specified at −85 dBc/Hz at a 1 Hz offset and 1 × 10⁻¹¹ at one second.
These figures describe oscillator performance, rather than a measurement of the complete playback system.
Reference Clock Distribution
Two BNC and two SMA outputs provide 10 MHz reference signals for compatible equipment. CelAudio recommends SMA connections when linking the NWX to compatible NS-series music servers.
An additional BNC input accepts an external 10 MHz reference. Rear-panel controls select the reference source and allow clock-status and Ethernet indicators to be switched off.
Technical Overview
Size
Width 33.5cm / 13.2’’
Depth. 21.5 / 8.5’’
Height. 11.5cm / 4.5’’
Weight
9.0kg. / 20.0lbs
Chassis
Machined Aluminum
Operating Voltage
110V / 230V / 50-60Hz
Power consumption
15W
Product Type
HiFi network switch with integrated reference clock
Switch Architecture
Two internal switch modules
Independent PHY, power supply and clock input for each RJ45 port
Ethernet Connections
4 × RJ45
10/100/1000 Mbps auto-negotiation
SFP Connections
4 × SFP
1000 Mbps, supporting 1000BASE-X / SGMII
Internal Clock System
10 MHz reference OCXO
50 MHz OCXO for the CelCLK II PLL system
1 Hz PLL locking bandwidth
Clock Outputs
2 × BNC and 2 × SMA
10 MHz, 3.3 V LVCMOS square wave
External Clock Input
1 × BNC
10 MHz, sine or square wave
Minimum input level: 0.6 V RMS