The asynchronous/synchronous serial network modules provide flexible multi-protocol support, with each port individually configurable in synchronous or asynchronous mode, offering mixed-media dial support in a single chassis. Applications for Asynchronous/Synchronous support include:
Low speed WAN aggregation (up to 128 Kbps)
Dial-up modem support
Async or Sync connections to management ports of other equipment
Transport of legacy protocols such as Bi-sync and SDLC