Cisco High-Speed - Expansion module - RS-232 x 8 - refurbished - for Cisco 18XX, 1921 4-pair, 1921 ADSL2+, 19XX, 28XX,

Cisco High-Speed - Expansion module - RS-232 x 8 - refurbished - for Cisco 18XX, 1921 4-pair, 1921 ADSL2+, 19XX, 28XX, 28XX V3PN, 29XX, 38XX, 38XX V3PN, 39XX

• WAN access and aggregation
• Legacy protocol transport
• Dial access server

Serial and asynchronous High-Speed WAN Interface Cards (HWICs) provide highly flexible connections for Cisco Integrated Services Routers. These HWICs help customers enable applications such as WAN access, legacy protocol transport, console server, and dial access server. You can mix and match HWICs to tailor cost-effective solutions for common networking problems such as remote network management, external dial-modem access, low-density WAN aggregation, legacy protocol transport, and high-port-density support.

• Legacy protocol transport
  Serial and synchronous/asynchronous ports are ideally suited to transport legacy traffic across a TCP/IP network, facilitating network convergence and eliminating costly separate leased lines for this traffic.
• Dial access server
  Asynchronous HWICs can connect to external dial modems to provide low-density dial access servers.