The Cisco Catalyst 4900 Series Switches are designed as a top-of-rack access layer switch for use with rack-optimized servers. The Cisco Catalyst 4900M series is part of the Cisco data center switching portfolio. The Cisco Catalyst 4900M is built as a top-of-rack switch and delivers the buffering, latency, and performance characteristics necessary to stand out in that role.

The Cisco Catalyst 4900M Series is a premium extension to the widely deployed Cisco Catalyst 4900 Series top-of-rack Ethernet switch specifically designed for data center networks. Optimized for ultimate deployment flexibility, the Cisco Catalyst 4900M can be deployed for 10/100/1000 server access with 1:1 uplink-to-downlink oversubscription and a mix of 10/100/1000 and 10 Gigabit Ethernet servers or all 10 Gigabit Ethernet server environments. The Cisco Catalyst 4900M is a fixed-configuration switch with 8 fixed wire-speed X2 ports on the base unit and 2 optional half-card slots for deployment flexibility and investment protection.

The Cisco Catalyst 4900M is a two-rack-unit and is unique in the top-of-rack space because it is semi-fixed. This flexibility provides a cost-effective and modular migration path from Gigabit Ethernet to 10 Gigabit Ethernet. The design of the Cisco Catalyst 4900M addresses several common challenges data centers face. It offers benefits such as hot-swappable flexibility, optional half-cards that can be changed as new servers require different media and port speeds, 16 MB of shared buffers to help prevent performance degradation, and it eliminates the need to deal with multiple OS and management systems.
 

Part numbers associated with this product;

WS-C4900M, WS-X4920-GB-RJ45, WS-X4904-10GE, WS-X4908-10GE, PWR-C49M-1000AC, PWR-C49M-1000AC/2, PWR-C49M-1000DC, PWR-C49M-1000DC/2, WS-X4992, CVR-X2-SFP, S49MIPB-12240XO, S49MIPBK9-12240XO, S49MES-12240XO, S49MESK9-12240XO