BLACK BOX 

BLACK BOX SM978A GANG SWITCH - 4U RJ45 CAT5E A/B CARD LATCHING

Mfg Part Number:  SM978A  
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Price: $267.43
Quantity:
In Stock/Mfg Direct Ship
Last Updated: Nov 12, 2026
No Sales Tax except these states
, PO and Wire.

The RJ45 CAT5e A/B switch latching card allows for the switching between two Ethernet connections with speeds up to 1 GbE, if power is lost the connection will default to the A location.

Controller Cards take up only one slot, and external power connects to the controller card, One slot is reserved for future use, leaving you with 16 slots for A/B Switch Cards. All switch cards take up one slot except for the power A/B cards which take up two slots. Manage access to networks, implement backup systems for network and computer connections, or share peripherals and other equipment.

Local features include LED status and manual switching. Remote control (dry contact closure, RS232, and Ethernet) provides unmatched management flexibility.

Gang Switch systems are used around the world to add secure access control and reliable backup for critical systems from space launch centers to stock exchange networks.

First, order the chassis

  • Gang Switch, 4U, 18-Card (SM960A)

Next order at least one power supply (order two for redundancy)

  • External Power Supply 100- 240 VAC (SM961-PS)
  • Internal Power Supply -48 VDC (SM760-PS1)
  • Internal Power Supply Dual -48VDC (SM760-PS2)

Then select a Controller Card

  • Ethernet (SNMP) (SM962A)
  • Logic Only (SM964A)

Next, choose your A/B Switch Cards

  • Serial DBxx: DB25 A/B Non-Latching (SM965A)
  • DB9 A/B Non-Latching (SM966A)
  • DB15 A/B Non-Latching (SM967A)
  • Power: 240 VAC 1 in 2 out (SM971)
  • 120 VAC 2 in 1 out (SM973)
  • Video: 75-ohm F-Connector (SM976A)
  • Multimode: SC Latching (SM977A-SC)
  • ST Latching (SM977A-ST)
  • RJ45 Copper: CAT5e Latching (SM978A)
  • CAT6 Latching (SM979A)

This product works with Power Supply (SM961-PS) A/B Switch Cards (SM965A, etc.)

Main Specification
General Information
Manufacturer Black Box Corporation
Manufacturer Part Number SM978A
Manufacturer Website Address http://www.blackbox.com
Brand Name Black Box
Product Name Pro Switching System Plus A/B Switch Card, RJ-45 CAT5
Product Type Expansion Module
Technical Information
Application/Usage Switching Network
Interfaces/Ports
Total Number of Ports 3
Connector Type RJ-45
Interfaces/Ports Details 3 x RJ-45 LAN
Media & Performance
Media Type Supported Twisted Pair
Miscellaneous
Compatibility Black Box Pro Switching System
Country of Origin United States
TAA Compliant Yes
Environmentally Friendly Yes
Warranty
Limited Warranty 1 Year
WARNING:: The plastic used in cable products can expose you to lead and lead components, chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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