Cisco High-Speed - Expansion module - HDLC, RS-232, PPP, RS-530, X.21, V.35, RS-449, SLIP, RS-530A - 4 ports - refurbished - for Cisco 1841, 1921 4-pair, 1921 ADSL2+, 19XX, 28XX, 28XX 2-pair, 29XX, 38XX, 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 selected Cisco integrated services routers. These HWICs help customers to enable applications such as WAN aggregation, legacy protocol transport, console server, and dial access server. Customers 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.
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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.
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Dial access server
Asynchronous HWICs can connect to external dial modems to provide low-density dial access servers.
