What's the differences between rsp4 and rsp4+

[gaoyang]

I want to know the differences between rsp4 and rsp4+

[Harold Ritter]

According to the included URL, there is not a big deal of difference between the two devices. Here's a quote:

The RSP4+ is an enhanced version of the RSP4 with larger default program memory (64 MB), Error Correction Code (ECC) memory protection, and compatibility with Cisco IOS® Software releases that support the current RSP4. This additional functionality is included with no increase in price, further enhancing the value of Cisco 7500 Series routers.

http://www.cisco.com/en/US/partner/products/hw/routers/ps359/prod_bulletin09186a00800886e1.html

Hope this helps,