Specifications

2-6 Cisco 2500 Series Multiport Serial Router User Guide
Prerequisites for System Operation
Warning This product relies on the building’s installation for short-circuit (overcurrent)
protection. Ensure that a fuse or circuit breaker no larger than 120 VAC, 15A U.S.
(240 VAC, 10A international) is used on the phase conductors (all current-carrying
conductors). (To see translated versions of this warning, refer to the appendix “Translated
Safety Warnings.”)
Prerequisites for System Operation
The multiport serial routers run system code from Flash memory single in-line memory
modules (SIMMs). With the proper system code image, the multiport serial router can also
run from dynamic random-access memory (DRAM); however, this operation requires a
4-MB memory upgrade (installation ofa1MBx36DRAM SIMM). In addition, operating
system code from DRAM can result in a 25 percent decrease in system performance.
Operating the system code from Flash memory is the default and is recommended for
optimum performance of the multiport serial routers.