Double click on above image to view full picture

Zoom Out
Zoom In



Cisco Refurbished
Original Part No : WS-X4908-10GE=

8pt 2:1 10 GE card REMANUFACTURED

Availability: In stock

Available Quantity: 8600

Delivery Time: 2 to 4 week

  • Add to Compare
  • Details

    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

    Product Overview

    The Cisco® Catalyst® 4900M Switch (Figure 1) 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.

    Figure 1.      Cisco Catalyst 4900M Switch

    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.

    Figure 2.      20-Port Wire-Speed 10/100/1000 (RJ-45) Half Card



    Figure 3.      4-Port Wire-Speed 10 Gigabit Ethernet (X2) Half Card



    Figure 4.      8-Port (2:1) 10 Gigabit Ethernet (X2) Half Card (Compatible with Cisco TwinGig Converter Module)


    Figure 5.      8-Port (2:1) 10GBASE-T RJ-45 Half Card [1] (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.

    Table 1.       Features and Benefits



    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

    * Supported only on 8-port (2:1) 10 Gigabit Ethernet (X2) half card.

    One System, Many Configurations

    The Cisco Catalyst 4900M can be configured to meet the needs of many types of top-of-rack deployments. Table 2 summarizes the configuration options.

    Table 2.       Cisco Catalyst 4900M Configuration Options


    10 Gigabit Ethernet (X2) Ports

    1/10 Gigabit Ethernet (10GBASE-T) Ports

    10/100/1000 Ports

    Gigabit Ethernet (Small Form-Factor Pluggable [SFP]) Ports Using TwinGig Converter Module

    10/100/1000 access with 10 Gigabit Ethernet uplinks





    10/100/1000 and 10 Gigabit Ethernet access with 10 Gigabit Ethernet uplinks

    12 or 16




    Gigabit Ethernet (SFP) access with 10 Gigabit Ethernet uplinks





    Gigabit Ethernet (SFP) and 10 Gigabit Ethernet access with 10 Gigabit Ethernet uplinks

    12 or 16




    10 Gigabit Ethernet access (X2) with 10 Gigabit Ethernet uplinks

    16 or 24




    Gigabit Ethernet (SFP) and 10/100/1000 access with 10 Gigabit Ethernet uplinks





    10 Gigabit Ethernet access (10GBASE-T) with 10 Gigabit Ethernet Uplinks





    10/100/1000 and 10 Gigabit (10GBASE-T) Ethernet access with 10 Gigabit Ethernet uplinks





    10 Gigabit (10GBASE-T) and 10 Gigabit (X2) Ethernet access with 10 Gigabit Ethernet uplinks

    12 or 16




    10 Gigabit (10GBASE-T) and Gigabit Ethernet (SFP) access with 10 Gigabit Ethernet uplinks





    10 Gigabit Ethernet and Gigabit Ethernet on the Same Half Card

    The Cisco TwinGig Converter Module (Figure 6) converts a single 10 Gigabit Ethernet X2 interface into two Gigabit Ethernet port slots that can be populated with SFP optics, enabling customers to use Gigabit Ethernet SFPs on the same card in combination with 10 Gigabit Ethernet X2 optics. The Cisco OneX Converter Module is supported on all 10 Gigabit Ethernet modules of the Cisco Catalyst 4900M. The Cisco OneX converts an X2 interface into one SFP+ interface and uses the full range of Cisco SFP+ transceivers (Figure 7).

    Figure 6.      Cisco TwinGig Converter Module Converts a 10 Gigabit Ethernet X2 Interface into Two Gigabit Ethernet SFPs

    sfp module white



    Figure 7.      Cisco OneX Converter Module Converts an X2 Interface into One SFP+ Interface

    Operational Consistency and Control

    The Cisco Catalyst 4900M includes a console port to manage all system features. Remote in-band management is available with Simple Network Management Protocol (SNMP), Telnet client, BOOTP, and Trivial File Transfer Protocol (TFTP). Support for local or remote out-of-band management is delivered through a terminal or modem attached to the console interface.

    The Cisco Catalyst 4900M supports file allocation table (FAT) file systems. System images can be updated directly through Microsoft Windows–based machines with compact flash memory readers.

    Using CiscoWorks solutions, Cisco Catalyst switches can be configured and managed to deliver end-to-end device, VLAN, traffic, and policy management. The CiscoWorks LAN Management Solution (LMS) bundle offers tools such as CiscoWorks Resource Manager Essentials and CiscoWorks CiscoView. These web-based management tools offer several services, including automated inventory collection, software deployment, easy tracking of network changes, views into device availability, and quick isolation of error conditions.

    Software Configuration Options

    Table 3 describes the software configuration options for the Cisco Catalyst 4900M Switch, and Table 4 describes the hardware options.

    Table 3.       Software Configuration Options for the Cisco Catalyst 4900M Switch

    Software Image


    IP Base image

    Standard Layer 3 image, including Routing Information Protocol Version 1 (RIPv1), RIPv2, static routes, and Enhanced Interior Gateway Routing Protocol (EIGRP) stub

    Enterprise Services image

    Enhanced Layer 3 image, including Open Shortest Path First (OSPF), EIGRP, and Border Gateway Protocol (BGP); also includes all IP Base image features

    Table 4.       Cisco Catalyst 4900 Series Hardware Comparison

    Feature and Description

    Cisco Catalyst 4948

    Cisco Catalyst 4948—10GE

    Cisco Catalyst 4900M

    Switching capacity

    96 Gbps

    136 Gbps

    320 Gbps


    72 mpps

    102 mpps

    250 mpps for IPv4

    125 mpps for IPv6

    IPv6 support

    In software

    In software

    In hardware





    Modular half-card slots




    Maximum 10/100/1000 Ports




    Maximum 10 Gigabit Ethernet (RJ-45) ports




    Maximum 10 Gigabit Ethernet (fiber) ports




    Maximum Gigabit Ethernet (fiber) ports



    32 (Cisco TwinGig Converter Module)

    Cisco TwinGig Converter Module support



    Yes (half cards only)

    Uplink optic types

    4 SFP optics

    Two X2 (10 Gigabit Ethernet) optics

    Eight X2 (10 Gigabit Ethernet) optics, 8 SFP+ (using OneX)

    Multilayer switching

    IP Base and Enterprise Services options

    IP Base and Enterprise Services options

    IP Base and Enterprise Services options

    Shared buffer

    16 MB

    16 MB

    17.5 MB


    266 MHz

    666 MHz

    1.3 GHz

    Synchronous Dynamic RAM (SDRAM)

    256 MB

    256 MB

    512 MB

    Active VLANs




    Multicast entries

    28,000 (Layer 3)

    16,000 (Layer 2)

    28,000 (Layer 3)

    16,000 (Layer 2)

    70,000 for IPv4

    35,000 for IPv6

    Per VLAN Spanning Tree (PVST) Protocol and VLAN IDs




    Spanning Tree Protocol instances




    Switched Virtual Interfaces (SVIs)




    Security and quality-of-service (QoS) hardware entries




    MAC addresses




    Switched Port Analyzer (SPAN)

    2 ingress and 4 egress

    2 ingress and 4 egress

    8 ingress and 8 egress

    USB port




    Compact flash memory support




    System reset button




    Minimum software requirement

    Cisco IOS® Software Release 12.2(20)EWA or later

    Cisco IOS Software Release 12.2(25)EWA or later

    Cisco IOS Software Release 12.2(46)SG or later

    Features at a Glance

    Layer 2 Features

       Layer 2 switch ports and VLAN trunks

       IEEE 802.1Q VLAN encapsulation

       Dynamic Trunking Protocol (DTP)

       VLAN Trunking Protocol (VTP) and VTP domains

       VTP pruning


       Port security on trunk port

       Q-in-Q passthrough

       Support for 4096 VLANs per switch

       PVST+ and Per-VLAN Rapid Spanning-Tree Protocol (PVRST)

       Spanning Tree PortFast and PortFast guard

       Spanning Tree UplinkFast and BackboneFast

       IEEE 802.1s

       IEEE 802.1w

       IEEE 802.3ad

       Spanning Tree root guard

       Cisco Discovery Protocol

       Internet Group Management Protocol (IGMP) versions 1, 2, and 3 snooping

       IPv6 Multicast Listener Discovery (MLD) snooping

       Cisco EtherChannel technology, Cisco Fast EtherChannel technology, and Cisco Gigabit EtherChannel technology across half cards and base unit

       Port Aggregation Protocol (PAgP)

       Link Aggregation Control Protocol (LACP)

       Unidirectional link detection (UDLD) and aggressive UDLD

       Jumbo frames (up to 9216 bytes)

       Baby Giants (up to 1600 bytes)

       Storm control (formally known as broadcast and multicast suppression)

       Forced 10/100 autonegotiation

       Bridge protocol data unit (BPDU) guard

       FlexLink and FlexLink with VLAN Load Balancing

       IEEE 802.1ab Link Layer Discovery Protocol (LLDP) and 802.1ab LLDP Media Endpoint Devices (LLDP-MED)

       Resilient Ethernet Protocol (REP)

       IEEE 802.1Q tunneling (Q-in-Q) in hardware

       Layer 2 protocol tunneling

    Layer 3 Features

       Jumbo frames on all ports (up to 9216 bytes)

       Hardware-based IP Cisco Express Forwarding routing at 250 mpps

       IP routing protocols: EIGRP, OSPF, BGP4, RIP, and RIPv2

       OSPF fast convergence

       OSPF and EIGRP fast convergence protection

       EIGRP stub

       Static routing

       Inter-VLAN routing

       Virtual Route Forwarding lite (VRF-lite)

       Multicast VRF-lite

       VRF-aware IP services

       EIGRP to Multi-VRF CE (VRF-lite)

       Equal Cost Multi Path Routing (ECMP), up to 8 paths

       IPv6: RIP next generation (RIPng) for IPv6

       IPv6: OSPFv3

       IPv6: EIGRP

       Software-based generic routing encapsulation (GRE) tunneling

       IGMP v1, v2, and v3

       IGMP filtering on access and trunk ports

       IP multicast routing protocols: Protocol Independent Multicast (PIM) (sparse mode [SM], dense mode [DM], SDM)

       Protocol Independent Multicast Version 6 (PIMv6) (SM)

       Pragmatic General Multicast

       Bidirectional (Bi-dir) PIM

       Internet Control Message Protocol (ICMP)

       ICMP Router Discovery Protocol

       Dynamic Host Configuration Protocol (DHCP) server

       Per-port multicast suppression

       Unicast Reverse Path Forwarding (RPF)

       Policy-based routing (PBR)

       PIM source-specific multicast (SSM) mapping

    High Availability Features

       1+1 hot-swappable AC or DC power supplies

       Hot-swappable field-replaceable fan tray with redundant fans

       Hot Standby Router Protocol (HSRP)


       Virtual Router Redundancy Protocol (VRRP)

       Cisco IOS Embedded Event Manager (EEM)

       Cisco Generic Online Diagnostics (GOLD)

       Enhanced Object Tracking (EOT)

    IPv6 Support

       RIP next generation (RIPng) for IPv6



       PIMv6 (SM)

       IPv6 unicast and multicast forwarding in hardware

       IPv6 addressing architecture

       Cisco Discovery Protocol IPv6 address family

       Cisco Express Forwarding and Distributed Cisco Express Forwarding in hardware

       Extended ACL

       ICMP rate limiting


       ICMPv6 redirect

       IP MIB

       IPv6 over IEEE 802.1Q

       IPv6 over IPv4 GRE tunnel (tunnel support in software)

       Intrasite Automatic Tunnel Addressing Protocol (ISATAP)


       MLD snooping

       MLDv1 and v2

       Maximum transmission unit (MTU) path discovery for IPv6


       IPv6: Secure Shell (SSH) over an IPv6 transport

       Stateless autoconfiguration

       Static routes within IPv6

       Authentication, authorization, and accounting (AAA)


       Trivial FTP (TFTP)


       Duplicate address detection

       Standard ACL

       IPv6 tunnels in software

       Hop-by-hop option header; in software

       DHCPv6 relay agent

       HSRPv2 IPv6

    Sophisticated QoS and Traffic Management

       Modular QoS command-line interface (MQC)

       Per-port per VLAN QoS

       Dynamic Tx queue sizing

       Strict priority queuing

       IP differentiated services code point (DSCP)

       IEEE 802.1p class of service

       Flexible classification marking

       Classification and marking based on full Layer 3 and 4 headers

       Input and output policing based on Layer 3 and 4 headers

       Support for 16,000 policers with flexible assignment for input and output

       2-rate 3-color policing

       Output queue management shaping and sharing

       Dynamic buffer limiting: Congestion-avoidance feature

    Performance and Scalability

       320-Gbps switching fabric

       Layer 2 hardware forwarding at 250 mpps

       Layer 3 hardware-based IP Cisco Express Forwarding routing at 250 mpps

       Layer 4 TCP and User Datagram Protocol (UDP) hardware-based filtering at 250 mpps

       Software-based learning at a sustained rate of 10,000 hosts per second

       55,000 unicast MAC addresses

       16,000 multicast MAC addresses

       200,000 entries in routing table (shared between unicast and multicast)

       4000 virtual ports (VLAN port instances)

       Bandwidth aggregation up to 16 Gbps through Cisco Gigabit EtherChannel technology.

       Bandwidth aggregation up to 160 Gbps for 10 Gigabit Ethernet through 10 Gigabit EtherChannel technology

       Hardware-based multicast management

       Hardware-based ACLs


       Console port to manage all system features

       Software configuration management, including local and remote storage

       Optional compact flash memory card to store software images for backup and easy software upgrades (future)

       USB drive support (future)

       FAT file system support

       Manageable through CiscoWorks Windows network-management software on a per-port and per-switch basis, providing a common management interface for Cisco routers, switches, and hubs

       SNMP v1, v2, and v3 instrumentation, delivering comprehensive in-band management

       CLI-based management console to provide detailed out-of-band management

       Remote monitoring (RMON) software agent to support four RMON groups (history, statistics, alarms, and events) for enhanced traffic management, monitoring, and analysis

       Analysis support, including ingress port, egress port, and VLAN SPAN

       Layer 2 traceroute

       Cisco SmartPort macros

       SPAN ACL filtering

       DHCP client autoconfiguration

       Enhanced SNMP MIB support

       Network Timing Protocol (NTP)

       E-OAM 802.3ah and Connectivity Fault Management (CFM; 802.1ag)

       Ethernet management port

       Remote SPAN (RSPAN)

       Smart Call Home

       Network Mobility Service Protocol (NMSP)

       Management port features

    Advanced Security

       TACACS+ and RADIUS, which enable centralized control of the switch and restrict unauthorized users from altering the configuration

       Standard and extended ACLs on all ports

       IEEE 802.1X user authentication (with VLAN assignment, voice VLAN, and port security)

       Router ACLs (RACLs) on all ports (no performance penalty)

       VLAN ACLs (VACLs)

       Port ACLs (PACLs)

       Private VLANs (PVLANs) on access ports

       DHCP snooping and Option 82 insertion

       Port security

       Sticky port security

       SSHv1 and SSHv2

       Unicast port flood blocking

       Dynamic Address Resolution Protocol (ARP) inspection

       IP source guard

       VLAN Management Policy Server (VMPS) client

       Network Admission Control (NAC) Layer 2 IEEE 802.1X

       NAC LAN port IP

       Secure Copy Protocol (SCP)

       Unicast RPF

       IEEE 802.1X Guest VLAN

       IEEE 802.1X Radius Accounting

       IEEE 802.1X MAC Authentication Bypass

       Control plane policing

       Access Node Control Protocol (ANCP) client

       Cisco Trusted Security Multihop Security Group Tag Exchange Protocol

    Technical Specifications


       CiscoWorks LMS; includes CiscoWorks Resource Manager Essentials

       CiscoWorks CiscoView

       SNMP v1, v2, and v3

       RMON I and II

       RFC 1213-MIB (MIB II)








       RFC 2233 (IF-MIB)




       RMON-MIB lite (RFC 1757)

       RMON2-MIB lite (RFC 2021)



       ENTITY-MIB (V1-RFC 2037) (V2- RFC 2737)








       BRIDGE-MIB (RFC 1493)





















       Static multicast MAC address in BRIDGE-MIB

    Industry Standards

       Ethernet: IEEE 802.3 and 802.3an (10GBASE-T)

       Fast Ethernet: IEEE 802.3u and 100BASE-TX

       Gigabit Ethernet: IEEE 802.3z and 802.3ab

       10 Gigabit Ethernet: IEEE 802.3ae

       IEEE 802.1D Spanning Tree Protocol

       IEEE 802.1w rapid reconfiguration of spanning tree

       IEEE 802.1s multiple VLAN instances of spanning tree

       IEEE 802.3ad LACP

       IEEE 802.1p class of service (CoS) prioritization

       IEEE 802.1Q VLAN

       IEEE 802.1X user authentication

       1000BASE-X (SFP)




       RMON I and II standards

    Optics Support

    SFPs used with Cisco TwinGig Converter Module for Gigabit Ethernet connectivity (supported only in WS-X4908-10GE(=) half card):

       GLC-T: 1000BASE-T SFP

       GLC-SX-MM: Gigabit Ethernet SFP, LC connector, and SX transceiver

       GLC-LH-SM: Gigabit Ethernet SFP, LC connector, and LX/LH transceiver

       GLC-BX-D: 1000BASE-BX10 SFP module for single-strand SMF, 1490-nm TX/1310-nm RX wavelength

       GLC-BX-U: 1000BASE-BX10 SFP module for single-strand SMF, 1310-nm TX/1490-nm RX wavelength

       GLC-ZX-SM: 1000BASE-ZX SFP

       Cisco (CWDM) SFP solution

    X2 Modules for 10 Gigabit Ethernet Connectivity

       X2-10GB-LR=: 10GBASE-LR X2 module

       X2-10GB-CX4=: 10GBASE-CX4 X2 module

       X2-10GB-LX4=: 10GBASE-LX4 X2 module

       X2-10GB-SR=: 10GBASE-SR X2 module

       X2-10GB-ER=: 10GBASE-ER X2 module

       X2-10GB-LRM=: 10GBASE-LRM X2 module

       X2-10GB-ZR=: 10GBASE-ZR X2 module

       DWDM-X2 =: 10GBASE-DWDM X2 module

    Cisco SFP+ Transceiver Modules for Cisco OneX Converter Module

       SFP-10G-SR=: Cisco 10GBASE-SR SFP+ module for multimode fiber (MMF)

       SFP-H10GB-CU1M: 10GBASE-CU SFP+ Cable 1 meter (Version -02)

       SFP-H10GB-CU3M: 10GBASE-CU SFP+ Cable 3 meter (Version -02)

       SFP-H10GB-CU5M: 10GBASE-CU SFP+ Cable 5 meter (Version -02)

    Product Specifications

    Tables 5 and 6 list the specifications for the Cisco Catalyst 4900M.

    Table 5.       Product Specifications: Dimensions

    Product Name

    Maximum Overall Dimension (H x W x D [mm])

    4900M 8-port base system

    3.5 (89) x 17.2 (437) x 17.9 (455)

    4900M 20-port 10/100/1000 RJ-45 half card

    1.9 (49) x 7.4 (188) x 8.2 (209)

    4900M 4 port 10GE half card with X2 interfaces

    1.9 (49) x 7.4 (188) x 8.2 (209)

    4900M 8 port 10GE half card with X2 interfaces

    1.9 (49) x 7.4 (188) x 8.2 (209)

    4900M 8 port 10GBASE-T RJ-45 half card

    1.9 (49) x 7.4 (188) x 8.2 (209)

    4900M AC power supply

    1.9 (49) x 7.3 (186) x 10.7 (272)

    4900M DC power supply

    1.9 (49) x 7.3 (186) x 10.7 (272)

    4900M spare fan tray

    3.4 (87) x 2.5 (64) x 17.8 (453)

    Table 6.       Product Specifications: Weight

    System Configurations


    Cisco Catalyst 4900M 8-port base unit plus fan (no power supply)

    25.0 lb (11.3 kg)

    Cisco Catalyst 4900M 8-port base unit plus fan and 1 AC power supply

    29.5 lb (13.4 kg)

    Cisco Catalyst 4900M 8-port base unit plus fan and 2 AC power supplies

    34.0 lb (15.4 kg)

    Cisco Catalyst 4900M 4-port 10 Gigabit Ethernet half card with X2 interfaces

    1.5 lb (0.7 kg)

    Cisco Catalyst 4900M 20-port 10/100/1000 RJ-45 half card

    1.5 lb (0.7 kg)

    Cisco Catalyst 4900M 8-port 10 Gigabit Ethernet half card with X2 interfaces

    2.5 lb (1.1 kg)

    Cisco Catalyst 4900M 8-port 10GBase-T RJ-45 half card

    2.5 lb (1.1 kg)

    Indicator and Port Specifications

       System status: Green (operational), red (faulty)

       Console: RJ-45 socket

       Reset (switch recessed for protection)

       Image management port: 10/100/1000BASE-T (RJ-45 socket) data terminal equipment (DTE); green (good), orange (disabled), and off (not connected)

       Air flow specifications (average):

         Air flow at 25°C (77°F) is approximately 77 cubic feet per minute (cfm)

         Air flow at 55°C (131°F ) is approximately 150 to 160 cfm

    Table 7 shows the air flow specifications by speed.

    Table 7.       Air Flow Specifications by Speed

    Speed Level


    Airflow (ft3/minute [m3/minute])



    77.7 (2.2)



    118.4 (3.4)



    127.6 (3.6)



    151.7 (4.3)

    Power Supply Specifications

    The Cisco Catalyst 4900M offers a choice of 1000W AC or DC power supplies. The switch can operate with one power supply present. When two power supplies are installed, the switch shares the power load between the two power supplies (Table 8).

    Table 8.       AC and DC Power Supply Specifications


    1000W AC

    1000W DC

    Input current

    14.12A root mean square maximum at 85 VAC input

    31.60A maximum at –40.5 VDC input

    Output current

    Maximum 80.0A

    Maximum 80.0A


    4.5 lb (2.0 kg)

    4.5 lb (2.0 kg)

    Heat dissipation

    Maximum use 818.88 British thermal units (BTUs) per hour

    Maximum use 1091.84 BTUs per hour

    Additional Information

    SKU WS-X4908-10GE-RF
    Weight (Kg) 1
    Datasheet URL
    Condition Refresh
    Module Type Half Card



    AED 0