Cisco 4900M, High-Performance Small Form-Factor Cisco Catalyst Switch
Cisco Catalyst 4900M Data Center Switch
High-Performance Small Form-Factor Cisco Catalyst Switch with Flexibility and Investment Protection for Top-of-Rack Switching or Midmarket Collapsed Core and Aggregation Layer Deployment

Cisco Catalyst 4900M Overview
The Cisco Catalyst 4900M Switch is designed for data center network top-of-rack switching and midmarket collapsed core and aggregation layer deployment. Optimized for ultimate deployment flexibility for the data center, the Cisco Catalyst 4900M can be deployed for 10/100/1000 or 1/10GBASE-T server access with 1:1 uplink-to-downlink oversubscription and environments with a mix of 10/100/1000 and 10 Gigabit Ethernet servers or all 10 Gigabit Ethernet servers.



The Cisco Catalyst 4900M is a 320-Gbps, 250-million-packets-per-second (mpps), two-rack-unit (2RU) fixed-configuration switch with eight fixed wire-speed X2 ports on the base unit and two optional half-card slots for deployment flexibility and investment protection. Low latency, scalable buffer memory, and high availability with 1+1 hot-swappable AC or DC power supplies and a field-replaceable fan tray optimize the Cisco Catalyst 4900M for data centers of any size.

For the midmarket collapsed core and aggregation layer and in the branch office, the Cisco Catalyst 4900M provides an ideal solution for space-constrained deployments that require high-performance wire-speed services and high availability. With the unique semifixed architecture and support of the Cisco TwinGig Converter Module, the Cisco Catalyst 4900M can be used in a collapsed core and aggregation layer LAN deployment, providing the flexibility to deploy Gigabit Ethernet now and cost-effectively migrate to 10 Gigabit Ethernet as requirements change.

The Cisco Catalyst 4900M configuration provides wire-speed connection, buffers to handle bursty traffic, and a comprehensive set of Layer 3 features required at the collapsed core and aggregation layer of the network. The Cisco Catalyst 4900M also supports a suite of ease-of-management features to simplify operations.

Features and Benefits
The Cisco Catalyst 4900M half cards provide a wide variety of combinations of Gigabit Ethernet and 10 Gigabit Ethernet media types. The base unit can accommodate up to two of the half cards shown in Figures 2, 3, 4, and 5, in any combination.

Figure2. 20-Port Wire-Speed 10/100/1000 (RJ-45) Half Card



Figure3. 4-Port Wire-Speed 10 Gigabit Ethernet (X2) Half Card



Figure4. 8-Port (2:1) 10 Gigabit Ethernet (X2) Half Card (Compatible with Cisco TwinGig Converter Module)



Figure5. 8-Port (2:1) 10GBASE-T RJ-45 Half Card1 (Capable of Operating at 1G/10G for Up to 100m on Cat6a/Cat7 Cable)



In addition to deployment flexibility, the half slots provide investment protection for further additions of Gigabit Ethernet and 10 Gigabit Ethernet media.

Table 1 summarizes the features and benefits of the Cisco Catalyst 4900M.
Table1. Features and Benefits

Feature	Benefit
Outstanding Scalability
17.5 MB shared buffers	Large buffers for microburst and high traffic control
Up to 320 Gbps and 250 mpps wire-speed performance with low latency	Delay-sensitive traffic forwarded without interruption
Wire-speed uplinks	Elimination of oversubscription bottlenecks between downlinks and uplinks across the switch with any combination of half cards
Configuration Flexibility
Choice of Gigabit Ethernet and 10 Gigabit Ethernet interfaces	Granular configuration options for all-Gigabit Ethernet to 10 Gigabit Ethernet transition
Choice of copper or fiber 1G/10G Ethernet interfaces	Mix and match 1G/10G RJ-45 and X2 line cards
Online insertion and removal of cards	In-service line card changes
Cisco TwinGig Converter Module support*	Gigabit Ethernet and 10 Gigabit Ethernet interface support on the same card
Dual AC or DC power	High availability for nonstop operation
Investment Protection
Modular half slots	Migration to new media types through additional half cards
Field-replaceable power supplies and hot-swappable removable fan	Extended longevity of hardware
Use of existing software	Consistent operational model for all Cisco Catalyst 4900 Series Switches

Note: Supported only on 8-port (2:1) 10 Gigabit Ethernet (X2) half card.
Tips: Original resources form Cisco’s websites, more info about Cisco Catalyst 4900M, INCLUDING Cisco Catalyst 4900M Configuration Options, Software Configuration Options for the Cisco Catalyst 4900M Switch, Technical Specifications(Indicator and Port Specifications, Power Supply Specifications, Software Requirements, Regulatory Standards Compliance), etc.. You can visit Cisco Catalyst 4900M Switch