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NetCrossing Gateway NX-2048 and NX-8192

Serial Over IP or Ethernet  (V.35, RS530, RS232)

Synchronous serial over IP or Ethernet


  • Carries synchronous data streams across an IP or Ethernet packet switch network
  • Fully configurable data port:
    • Speeds up to 2048 Kpbs  (NX-2048) or 8192 Kbps (NX-8192)
    • Multiple electrical interfaces (RS232, RS449, RS530, V.35, X.21)
    • Multiple clock source configurations
  • Additional User Ethernet port with transparent bridging and configurable rate limits
  • Selectable encapsulation: Ethernet only to cross a single network, or full IP/UDP to cross multiple networks
  • Independent Type of Service (ToS) settings for both streams over the IP network
  • Optional data encryption
  • Automatic scan mode finds a peer gateway across the Ethernet
  • Low end-to-end latency
  • Easy configuration
  • Remote management through Telnet, SNMP or “Afar Ethernet Console
  • Remote software updates
  • Adapted for wireless applications
    • Provides power to the radio
    • Synchronizes RF transmissions allowing deployment of large number of co-located radios


The Afar NetCrossing™ gateway breaks a continuous serial data stream into fixed size packets, adds the Ethernet or IP framing, and sends them over a packet switch network to a remote gateway. At the remote end, the gateway removes the Ethernet or IP framing and reconstructs the original data stream. The gateways regenerate the clocks and keep both ends synchronized with no bit slips.

The receiving NetCrossing™ gateway buffers a number of incoming packets in order to compensate for the packet delivery jitter introduced by the network. The size of this buffer is configurable to accommodate different amounts of expected jitter. The unit collects statistics of the network jitter, and can automatically optimize the buffer size for minimal link latency.

If the application is to cross a single Ethernet network, the gateways create packets using simple and very efficient SNAP encapsulation. Or you may configure the units to perform full IP/UDP encapsulation, which allows crossing multiple networks.

When crossing a single network the gateways can automatically scout for an unconnected peer and establish a point-to-point connection with minimal configuration required. Configuration and monitoring is performed using a terminal connected to a front panel console port or through the LAN port using Telnet, SNMP or the Afar Ethernet Console program.

In addition to the serial data stream, the gateways include a user LAN Ethernet port. This port implements a transparent learning bridge which only forwards to the remote peer the packets addressed to stations on the remote LAN. You can set a limit on the cumulative throughput offered to the network. In this case the gateway gives priority to the serial port and allocates to the user LAN the remaining bandwidth. This is useful if the network port has a throughput limitation imposed by, for example, a radio link.

For wireless applications the NetCrossing™ gateway is designed to work seamlessly with all the Afar PulsAR Wireless Ethernet Bridges. The gateway provides data, control and power to the radio through a single Cat5 cable. The radio is enclosed in a waterproof enclosure allowing outdoor deployment for improved system performance. In addition, if your application requires multiple wireless links emanating from the same location, the NetCrossing™ gateways can synchronize the transmissions of all the radios such that they do not cause self-interference . This is achieved by simply daisy chaining the SYNC ports of all of the NetCrossing™ gateways. 

Serial over IP gateway rear panel

Serial over IP NetCrossing Gateway – Rear Panel view


Serial over IP NetCrossing Gateway NX-2048 / NX-8192

Network Port (WAN)

  Interface: 10/100 Base T, full/half duplex, auto-negotiate
  “Switch” Connector: RJ45 for direct connection to switch or router
  “Radio” Connector: RJ45 with Power Over Ethernet for direct connection to Afar radio

Serial Port


3500 bps to 2048 kbps
3500 bps to 8192 kbps  
  Interface: RS232,RS530,RS530A,RS449,V.35,X.21
  Connector: DB25 female (DCE)
  Clock Source: Internal, External, Remote

User Ethernet Port (LAN)

  Interface: 10 Base T, full/half duplex
  Connector: RJ45

Console Port (front panel)

  Interface: RS-232 / V.24
  Baud Rate: 9600 to 115.2 Kbaud
  Connector: DE9 female (DCE)

Synchronization Port

  Connectors: Two RCA audio (for synchronization of co-located radios)


  Input Voltage: 8 to 28 Volts DC
110 to 220 VAC (external supply)
  Consumption: 3.3 Watt


  Operating Temperature: 0 to 55 deg C
32 to 130 deg F
  Humidity: up to 90% non-condensing


  Dimensions: 22.8 x 15.2 x 3.8 cm
9″ (W) x 6″(D) x 1.5″ (H)
  Weight: 0.45 Kg
1.0 lb


AFAR Communications, Inc | 81 David Love Place | Santa Barbara, CA | USA 93117
T: +1 805 681-1993 | F: +1 805 681-1994