HSSI Interface: What device to use?

[vgirnet]

Hello,

We have 2 routers Cisco 7206, at about 300 meters one from other.

What devices must be used to connect these routers using HSSI Interfaces?

There is no way to put some optic cable, need HSSI connection over existing Cat.3 cable.

[ssoberlik]

I think a HSSI null modem cable is used for connecting two routers back to back through the HSSI interface. The maximum length allowed for this cable is only 50 feet. For longer distance, you need to probably use a HSSI interface cable and a CSU/DSU at both ends. Please look at the following URL for more information :

http://www.cisco.com/univercd/cc/td/doc/product/cable/cab_rout/cfig_nts/3280hssi/3280over.htm#xtocid4