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Async RS-232 Stat Mux Multiplexor over Composite Port V.35 or 10/100 Ethernet, 8-Port

Link eight RS-232 ports over a sync WAN link or a LAN with this next-generation stat mux.


Limited Quantity In Stock
Typically Ships within One Week
Extended Double Diamond™ Warranty Available (3 Additional Year)

*Required field

Product Features

  • Integrates eight async RS-232 ports with Ethernet and sync serial V.35 ports.
  • Gives your RS-232 device network a smooth transition to IP network connectivity.
  • Transmits the composite data stream transparently over the Internet, a private IP network, or a PPP or Frame Relay network.


  • Multiplexed data can use existing LAN, WAN, and Internet connections at the same time.
  • Great for remote office and branch office extension and access.
  • Creates an encrypted QoS tunnel between local and remote sites.
  • Password-protected Web-based management, SNMP, and CLI management.
  • Per-port configurations for speed, flow control, echo, and testing.
  • Automatic MDX (auto-crossover) detection and configuration on Ethernet ports.

    Linking a number of asynchronous terminals, hosts, and other devices just got a whole lot easier. With the Black Box® 8-Port Async Stat Mux with IP Access, you can transmit the composite data stream from multiple async devices over the Internet or a private IP network.

    This way, you can connect to any synchronous dedicated WAN or IP-based Ethernet network without the expense of dedicated lines. What's more, by adding an IP network connection to your system, you can be at the forefront of industrial networking.

    The 8-Port Async Stat Mux with IP Access also "futureproofs" legacy equipment by providing access and connectivity to the IP-based network while simultaneously supporting existing sync serial connections. It's the ideal replacement for aging multiplexors connecting PLCs, meters, gas pumps, and similar async devices, particularly those in industrial automation networks.

    Flexible multiport async terminal connectivity.
    The 8-Port Async Stat Mux with IP Access combines 115.2-kbps output streams from up to eight RS-232 devices, consolidating the signals onto a single sync WAN link or IP/Ethernet LAN connection for transparent multiplexing.

    The integrated composite port on the stat mux gives you a standard sync link connection to NTUs, DSUs, or traditional WAN services. Connect to your dedicated WAN or, more inexpensively, use standard PPP or Frame Relay networking. It's your choice.

    The stat mux offers straightforward setup. Simply run a twisted-pair cable from your broadband modem's subscriber port to the first Ethernet port on the mux and another network cable from the second Ethernet port to your LAN. To connect to a WAN, just patch a DB25 cable from the unit's DB25 composite connector to your V.35 NTU device.

    Secure, reliable, and easy to manage.
    One 8-Port Async Stat Mux with IP Access unit, configured as the master, communicates with a second stat mux unit (the slave), typically, at a remote site.

    For end-to-end security, the stat mux performs IPSec encryption across the public network. Plus packet labeling and integrated data QoS with user-configurable flow control ensure higher service quality. Beyond that, it performs CRC-16 checks, transparent data checksums, and in-order data delivery. If there is an error, the stat mux retransmits data automatically.

    For local and remote configuration, control, and troubleshooting, the stat mux offers integrated management. A supervisory port on the front of the unit enables out-of-band access, or you can use a LAN-based service (such as Telnet, SNMP, or an HTTP browser) to manage it remotely.

    Get a complete view of your port connections at any time. A terminal configuration screen displays the list of terminal ports and the current state of the ports. Through this interface, you can view traffic statistics, review channel status, monitor events, and more.

    IP services supported:
  • IPv4
  • RIPv1 and RIPv2 (RFC 1058 and 2453)
  • ICMP message redirect (RFC 792)
  • Packet fragmentation
  • Differentiated Services (DiffServ)/ToS set or queue per header bits
  • Packet policing for discarding excess traffic
  • 802.1p/802.1Q VLAN support with 4096 IDs
  • IPsec AH & ESP protocols
  • Manual and IKE keying
  • AES, DES, and 3DES encryption

    NOTE: Must be used in pairs.

  • Tech Specs

    CE Approval Yes
    Composite Port Clock Receive clock (external); transmit clock (selectable as internal or external)
    Composite Port Encoding NRZ or NRZI
    Composite Port Error Rate and Correction 16-bit CRC-CCITT with ARQ (automatic re-transmission on error)
    Composite Port Speed Serial up to 1.2 bps-2 Mbps (selectable), Ethernet autodetect of 10- and 100-Mbps equipment
    Connectors Serial: (8) RJ-45 F (RS-232); Composite V.35: (1) DB25 F; Ethernet: (2) RJ-45 (10BASE-T/100BASE-T); Console: (1) RJ-45 F (RS-232 for serial terminal)
    Dimensions 1.6"H x 6.6"W x 7.3"D (4.1 x 16.8 x 18.5 cm)
    Indicators LEDs: (8) Serial Port Status, (1) Power, (1) Run, (1) Alarm, (1) Test, (1) Ethernet 0 Link, (1) Ethernet 1 Link
    IP Connectivity Protocols V.35 Frame Relay (8PVCs); RFC1490; FRF.12 fragmentation; LMI; Q993D; ANSI 617D; Gang of Four; PPP, PAP, CHAP, LCP, IPCP; TCPRAW; UDP; Telnet; DHCP; NAT
    Power Input: 100-240 VAC, 50-60 Hz, autosensing Dissipation: 8-10 W
    RoHS Yes
    Serial Data Flow Control Software selectable (X-ON/X-OFF) or hardware (RTS/CTS) in both directions
    Serial Data Format 5, 6, 7, or 8 bits (selectable); 1, 1.5, or 2 stop bits, odd, even, or no parity
    Serial Port Speed Aggregate maximum: 2 Mbps; Data communication: 50 bps-230.4 kbps (selectable)
    System CPU: Motorola MPC859 @ 50 MHz; Memory: 16 MB SDRAM/4 MB flash
    Weight 1.2 lb. (0.5 kg)

    * Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 877-877-2269.


    Double Diamond Warranty

    Extended 1 Year Warranty Available

    Protect your purchase with an additional 1 Year Double Diamond™ warranty!
    Cost: $116.10

    Extended 3 Year Warranty Available

    Protect your purchase with an additional 3 Year Double Diamond™ warranty!
    Cost: $232.20


    Double Diamond™ Warranty (Standard)

    Take the risk out of equipment purchases with the Double Diamond™ Warranty from Black Box Network Services.

    The Double Diamond Warranty is our warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

    The 8PT Async RS232 Stat Mux Multiplexor over Composite V.35 or 10/100 comes with a standard 1 Year Double Diamond™ Warranty (Standard) already included.

    During the warranty period, Black Box Network Services will repair or replace your damaged equipment within one week of receipt at NO CHARGE!*

    Plus, get an Extended Double Diamond Warranty.

    You can also extend your warranty or protect a previously purchased Black Box® brand product** for an additional year—for only 10% of the purchase price! Or, extend your coverage for a full three years for only 20% of the purchase price!

    Ordering an extended warranty is easy: When viewing a product in your shopping cart, just select the one or three years of additional coverage in the dropdown menu under “Warranty Options.” For details, contact Customer Service at 724-746-5500.

    * Warranty subject to certain exclusions and limitations ** Certain products may not be eligible.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.