Normally they are to expensive for what they do, but the other day I found a HWIC-8A from ebay at a good price. As a result, I now have remote Serial & JTAG access to a bunch of test equipment via my Cisco Router. The following is a quick sample config I tossed together on how to configure it.
If needed the following is the pin-out to the Cisco Octal Cable: http://www.cisco.com/c/en/us/support/docs/dial-access/asynchronous-connections/14958-24.html
! Create a AAA authentication policy that will ! not make the user supply local credentials to ! connect to the Async TTY's. aaa new-model aaa authentication login TERMSERV none ! Create an ACL to control who can connect. ! Warning: Anyone will be able to connect to the ! tty's when transport is configured. ip access-list standard TERMSERV remark *** TERMSERV ACCESS *** permit 10.0.0.0 0.255.255.255 permit 172.16.0.0 0.15.255.255 permit 192.168.0.0 0.0.255.255 ! Need to change the physical-layer to async ! Interface descriptions correspond to the ! CAB-HD8-ASYNC cable each port will represent. interface Serial0/0/0 physical-layer async description [0-3/0] ! interface Serial0/0/1 physical-layer async description [0-3/2] ! interface Serial0/0/2 physical-layer async description [0-3/4] ! interface Serial0/0/3 physical-layer async description [0-3/6] ! interface Serial0/0/4 physical-layer async description [4-7/0] ! interface Serial0/0/5 physical-layer async description [4-7/2] ! interface Serial0/0/6 physical-layer async description [4-7/4] ! interface Serial0/0/7 physical-layer async description [4-7/6] ! Set transport type and bind ACL/AAA to the Async lines. line 0/0/0 0/0/7 access-class TERMSERV in vrf-also login authentication TERMSERV transport input all transport output all