Buy with Confidence: With Monoprice's Lifetime Warranty on all Cables, you can rest assured we stand behind our products and our customers.It supports RS-422 balanced signals and RS-423 unbalanced signals with data rates up to 10 Mbps over very short distances and 2 Mbps over more reasonable distances. Although the standard was withdrawn in September 2002 it is still used with some network communications equipment where high throughput and/or long distances are required. The RS-449 cable is also used for V36 modem equipment