Cisco 72-0789-01 X.21 DTE Cable V1285 Male to DB60 Male 10ft WAN Serial

Cisco 72-0789-01 X.21 DTE Cable V1285 Male to DB60 Male 10ft WAN Serial

The Cisco 72-0789-01 is a 10-foot X.21 DTE serial cable connecting a V1285 male plug on one end to a DB60 male connector on the other. It is designed for use with Cisco routers and WAN interface cards that use the X.21 serial standard, providing the physical layer link between DTE (Data Terminal Equipment) and DCE (Data Communications Equipment) for synchronous serial WAN connections.

Specifications & What's Included

• Manufacturer: Cisco
• Part Number: 72-0789-01
• Cable Type: X.21 DTE Serial
• Connector A: V1285 Male (X.21 / V.11 DTE interface)
• Connector B: DB60 Male (60-pin high-density)
• Cable Length: 10 ft (approximately 3 m)
• Interface Standard: X.21 / ITU-T V.11 (DTE side)
• Cable jacket: gray, flexible; intact with no visible cuts or kinks
• Includes: cable only

Applications

X.21 is an ITU-T standard for synchronous serial communications over digital networks, widely used in European and Asian WAN environments as an alternative to V.35 and RS-232 for leased-line and packet-switched connections. The DB60 connector is the high-density 60-pin interface found on many Cisco router WAN interface cards (WICs) and serial port adapters from the 1990s and 2000s, including those used in the Cisco 2500, 2600, 3600, and 7000 series routers. This cable type connects a Cisco router's DB60-equipped WAN port to an X.21 DCE device such as a CSU/DSU, modem, or network termination unit, enabling synchronous serial WAN links for Frame Relay, leased-line, and similar services. These cables remain in use wherever legacy Cisco WAN hardware is still deployed in enterprise or carrier environments.