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Emerald® Gigabit Ethernet Network Switch, 48-Port

Part of the Emerald HD/4K KVM extension and matrix switching solution that simplifies access to both physical and virtual servers.

Call for Pricing

Limited Quantity In Stock
Typically Ships within One Week
Call 877-877-2269 for pricing and to place order.
Extended Double Diamond™ Warranty Available (3 Additional Year)

Product Features

  • 260Gbps full duplex non-blocking switching architecture
  • Includes (48) 10/100/1000-Mbps twisted-pair ports
  • Also includes (4) SFP+ 10-GbE uplink ports for maximum flexibility and investment protection
  • Hot-swappable power supplies and fans
  • Supports jumbo frames for high-end performance in virtualized environments and IP storage/server communication


An Emerald KVM network may start small, but it’s infinitely scalable to meet your expansion needs and future technology path just by adding endpoints, with no additional chassis or cards required.

System by Design

Emerald comprises of a choice of transmitters connecting computers or virtual machines to the system and receivers connecting the user consoles. High-performance Emerald network switches with 12, 28,- 32-, or 48 ports ensure trouble-free KVM over IP extension and matrix switching connections. A range of SFP/SFP+ transceivers proofs best performing video quality and KVM extensions over the required distances.

Use the Emerald transmitter to connect DisplayPort servers with resolutions up to 4K60, transparent USB, serial, and audio to your Emerald System.

Instant access across the entire enterprise

Emerald makes your migration painless, enabling you to scale access infinitely and gradually across buildings, campuses and the wide area network, using your existing network infrastructure—with switching between sources at speeds of less than half a second.

Digital video at its best

Emerald is the first KVM platform that supports pixel-perfect 4K DisplayPort video at 60 Hz over standard IP network switches. Image transmission with mathematical lossless compression visualizes every single pixel at 60 fps with 10-bit color depth.

If you're not ready for 4K, start with the Emerald 2K options, supporting one or two full HD DVI channels, and migrate to 4K at your own pace by transitioning individual user groups when the need arises.


More and more physical servers are being replaced by virtualization, allowing better performance, availability, scalability, and return on investment. Emerald simplifies access to both physical and virtual servers with virtual machine support for VMware, Microsoft, and Citrix, using RDP 8.1, RemoteFX and PCoIP, among others.

Fail-safe operation

All Emerald transmitters and receivers feature copper or fiber connectivity through one (HD) or two (4K) flexible SFP+ slots.

Your 24/7 operation requires network resilience. Use the redundant network ports on the Emerald units to provide continuous, uninterrupted operation even if one network link experiences loss-of-service. Connect the endpoints either through two alternative direct links, a direct link and a network connection or two independent networks.

Network Requirements

For HD video, Emerald requires a standard Gigabit Ethernet network and possibly a 10 Gigabit aggregate switch, depending on how many endpoints you have. For 4K video, you’ll need a standard 10 Gigabit Ethernet network with a 100 Gigabit aggregate switch for 20+ endpoints. For both, the network infrastructure required by Emerald can be built with IEEE 802.3 standards-based components from Black Box or other manufacturers.


Emerald supports two ways to manage the system: locally via the receiver’s OSD or the Boxilla central KVM manager. Emerald in combination with Boxilla enables timesaving, controllable presets and multi-user settings. Monitor network usage, define user access rights and set up automated intrusion alerts. You can also pool designated CPU resources, allowing for user selection by type of server/PC/desktop rather than by individual dedicated resource. Even more important, you can prepare for instantaneous recovery from disasters with one-click access to an entire backup control room in a different location. The KVM main control room configuration can be replicated anywhere you have a network connection.

Integration with other KVM Systems

Emerald works flawlessly with these popular Black Box KVM product families:

  • Freedom II Multi-Monitor Switch
  • ControlBridge system for one-touch, multisystem control
  • Boxilla KVM manager

Tech Specs

Operating Humidity 5 to 85% (RH), non-condensing
Operating Temperature 32° to 113°F (0° to 45°C)
Storage Temperature –40° to 158°F (–40° to 70°C)
CE Approval Yes
Compliance Safety
UL/CSA/EN 60950-1 second edition
Europe: EN 55032: 2015+A1:2007 (CISPR 32),
USA: FCC CFR 47 Part 15, Subpart B:2009, Class A
EN 300 386 V1.4.1:2008 EMC for Network Equipment
EN 55024: 1998 + A1: 2001 + A2: 2003
EN 61000-3-2: Harmonic Current Emissions
EN 61000-3-3: Voltage Fluctuations and Flicker
EN 61000-4-2: ESD
EN 61000-4-3: Radiated Immunity
EN 61000-4-4: EFT
EN 61000-4-5: Surge
EN 61000-4-6: Low Frequency Conducted Immunity
Dimensions 1.71”H x 17.09”W x 12.6”D (4.4 x 43.4 x 32.0 cm)
Management Network Management
Port Mirroring
Support Assist (Phone Home)
Netconf APIs
XML Schema
CLI Commit (Scratchpad)
Performance MAC addresses: up to 80k
IPv4 routes: 16K
IPv6 routes: 8K (shared CAM space with IPv4)
Switch fabric capacity: 260Gbps (full-duplex)
130 Gbps (half-duplex)
Forwarding capacity: 131 Mpps
Link aggregation: 16 links per group, 128 groups per stack
Queues per port: 8 queues
Layer 2 VLANs: 4K
MSTP: 64 instances
VRF-lite: 64 instances
Line-rate Layer 2 switching: all protocols, including IPv4 and IPv6
Line-rate Layer 3 routing: IPv4 and IPv6
IPv4 host table size up to 40k max
IPv6 host table size 8K
IPv4 Multicast table size 8K
LAG load balancing: based on Layer 2, IPv4 or IPv6 headers
Latency 3.7 μsec for 1000BASE-T, ~1.8 μsec for SFP+
Packet buffer memory: 4MB
CPU memory: 2GB
Ports 48 ports 1000BASE-T (RJ45), 4 ports 10GE SFP+ cages, 1 port RS232 console (RJ45), 1 port 10/100/1000BASE-T management, 1 USB 2.0 type A storage port
Power 100–240 VAC 50/60 Hz hot swappable power supplies (one supply included)
Access Control Lists
Prefix List
Rate Shaping (Egress)
Rate Policing (Ingress)
Scheduling Algorithms
  • Round Robin
  • Weighted Round Robin
  • Deficit Round Robin
  • Strict Priority

  • Weighted Random Early Detect
    UL/CSA 60950-1, Second Edition
    EN 60950-1, Second Edition
    IEC 60950-1, Second Edition Including All National Deviations and Group Differences
    EN 60825-1 Safety of Laser Products Part 1: Equipment Classification Requirements and User’s Guide
    EN 60825-2 Safety of Laser Products Part 2: Safety of Optical Fiber Communication Systems
    FDA Regulation 21 CFR 1040.10 and 1040.11
    Weight 12.8 lbs (5.84 kg)
    Power 87W
    Power Supply 90–264 VAC 50/60 Hz; one supply included, optional redundant power supplies
    Product Includes:
    • (1) Switch
    • (1) Power supply
    • (4) Fans
    • Rackmount Kit

    * 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: $602.00

    Extended 3 Year Warranty Available

    Protect your purchase with an additional 3 Year Double Diamond™ warranty!
    Cost: $1,204.00


    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 Gigabit Ethernet Network Switch, 48-Port - Emerald comes with a standard 2 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.