Quick tech specs
- Speed
- HDLC
- PPP
- X.21
- RS-449
- RS-530A
- for Cisco 1841
- 1921 ADSL2+
- 28XX
- 29XX
- 39XX
- Expansion module
- RS-232
- RS-530
- V.35
- SLIP
- 4 ports
- 1921 4-pair
- 19XX
- 28XX 2-pair
- 38XX
Know your gear
HWIC-4A/S is a 4-port multiprotocol low speed asynchronous/synchronous HWIC. Protocols supported are Async (SLIP), Async (PPP), HDLC, Bisync, and transparent.