Linksys SRW248G4P

Характеристики

Secure, Reliable Switching with PoE for Growing Small Businesses

Highlights

• Connects up to 48 network devices - PCs, printers, and servers - to share and transfer files and videos across your network
• Power over Ethernet easily and cost-effectively powers wireless access points, video cameras, and other network-connected endpoints
• Enhanced QoS helps ensure a consistent network experience and supports networked applications including voice, video, and data storage
• Strong security protects network traffic to keep unauthorized users off the network

The Cisco® SRW248G4P 48-Port 10/100 + 4-Port Gigabit Switch (Figure 1) offers a highly secure means of expanding your network. Web-based configuration of the switch is secured using SSL. User access is verified with 802.1X security using a RADIUS authentication mechanism and can also be controlled using MAC-based filtering.

Extensive quality of service (QoS) features makes the solution ideal for real-time applications such as voice and video. The four priority queues, together with the weighted round-robin and strict priority scheduling techniques, facilitate efficient coexistence of real-time traffic with data traffic, allowing each to meet its QoS needs. Individual users or applications can be prioritized above others using various class of service options - by port, Layer 2 priority (802.1p), and Layer 3 priority (type of service [ToS] or differentiated services code point [DSCP]). Intelligent broadcast and multicast storm control minimizes and contains the effect of these types of traffic on regular traffic. Internet Group Management Protocol (IGMP) snooping limits bandwidth-intensive video traffic to only the requestors without flooding all users. Incoming traffic can be policed and outgoing traffic can be shaped, allowing you to control network access and traffic flow.

Other features of the Cisco SRW248G4P allow you to expand and grow your network of switches. Link aggregation allows multiple high-bandwidth trunks between switches to be set up. This also provides reliability, in that the system continues to operate if one of the links breaks. Spanning Tree Protocol (STP), Fast STP, Rapid STP (RSTP), and Multiple STP (MSTP) allow you to build a mesh of switches, increasing the availability of the system. The rich features of the WebView management software include Simple Network Management Protocol (SNMP), Remote Monitoring (RMON), Telnet, and HTTP management options, allowing you to flexibly integrate and manage these devices in your network.

Automatic load sensing in the power control circuitry automatically detects Power over Ethernet (PoE) on the access points before providing power. Power feeding of Ethernet is limited for the fixed 10BASE-T/100BASE-TX ports. The switch can provide maximum output power per PoE port of up to 15.4W on 24 ports or 7.5W on 48 ports simultaneously. Each port has independent overload and short-circuit protection, with LED indicators for power status. Cable diagnostics can be performed using the switch's WebView utility.

Features:

• Forty eight 10/100 switched RJ-45 ports deliver up to 4 Gbps of throughput per port
• Two shared 10/100/1000 mini Gigabit Interface Converter (mini-GBIC) ports
• Switching capacity delivers wire-speed performance at 17.6 Gbps, nonblocking capacity
• WebView monitoring allows administrators to view the current status and configuration using their favorite web browser
• PoE on forty-eight 10/100 ports supplies up to 7.5W per port, or on twenty-four 10/100 ports supplies up to IEEE 802.3af maximum of 15.4W per port
• Automatic medium dependent interface (MDI) and MDI crossover (MDI-X) cable detection
• Port-based and 802.1Q-based VLANs support up to 256 VLANs
• Port trunking for up to eight groups allows you to increase your bandwidth for each uplink or server connection
• Port configuration settings for link, speed, auto MDI/MDI-X, flow control, and more
• Fully rack mountable using the included rack-mounting hardware
• MAC address table supports up to 8000 MAC address entries
• Optimal platform to support real-time applications such as voice and video by providing features like IGMP snooping, multiple queues (four) with appropriate scheduling techniques, prioritization of traffic based on port, 802.1p, IP ToS/precedence/DSCP, TCP/User Datagram Protocol (UDP) port, and line rate forwarding mechanisms
• Enhanced QoS functions, including rate limiting for ingress/egress and per flow at 64 kbps granularity
• Secure control via SSH for Telnet interface and SSL for HTTP interface
• User/network security via 802.1X (with RADIUS authentication) and MAC-based filtering
• Advanced security access control list (ACL) can deny or limit network access based on Layer 1 through 4 information such as MAC, Ethernet type, VLAN ID, IP address, protocol ID, or TCP/UDP port
• Containment of storms - broadcast and multicast
• Expandability and availability increased across multiple switches using link aggregation
• SNMP and RMON management expand your visibility options

Ports
48 RJ-45 connectors for 10BASE-T, 100BASE-TX, and 1000BASE-T with 2 shared Small Form-Factor Pluggable (SF) slots and 2 mini-GBIC ports
 
Cabling Type
Unshielded twisted pair (UTP) Category 5 or better for 10BASE-T/100BASE-TX, UTP Category 5 Ethernet or better for 1000BASE-T
 
LEDs - Power, Link/Act, Speed
 
Switching capacity - 17.6 Gbps, nonblocking
 
MAC table size - 8000
 
Number of VLANs - 256 active VLANs - 4096 range
 
Web user interface - Built-in web user interface for easy browser-based configuration (HTTP/HTTPS)
 
SNMP - SNMP versions 1, 2, and 3 with support for traps
 
SNMP MIBs
• RFC1213 MIB-2, RFC2863 interface MIB
• RFC2665 Ether-like MIB
• RFC1493 bridge MIB
• RFC2674 extended bridge MIB (P-bridge, Q-bridge)
• RFC2819 RMON MIB (groups 1, 2, 3, and 9 only
• RFC2737 entity MIB
• RFC 2618 RADIUS client MIB

RMON
Embedded RMON software agent supports 4 RMON groups (history, statistics, alarms, and events) for enhanced traffic management, monitoring, and analysis
 
Firmware upgrade
• Web browser upgrade (HTTP)
• Trivial File Transfer Protocol (TFTP) upgrade

Port mirroring
Traffic on a port can be mirrored to another port for analysis with a network analyzer or RMON probe
 
Other management
• RFC854 Telnet (menu-driven configuration)
• SSH and Telnet management (SSH v2)
• Telnet client
• SSL security for web user interface
• Switch audit log
• Dynamic Host Configuration Protocol (DHCP) client
• BOOTP
• Simple Network Time Protocol (SNTP)
• Xmodem upgrade
• Cable diagnostics
• Ping

Security Features
IEEE 802.1X
802.1X - RADIUS authentication; MD5 encryption
 
Access control
ACLs - drop or rate limit based on:
• Source and destination MAC address
• Source and destination IP address
• Protocol
• ToS/DSCP
• Port
• VLAN
• Ethertype
Availability
 
Link aggregation
• Link aggregation using IEEE 802.3ad Link Aggregation Control Protocol (LACP)
• Up to 8 ports in up to 8 trunks

Storm control - Broadcast and multicast
 
Spanning Tree - IEEE 802.1d STP, IEEE 802.1w RSTP, IEEE 802.1s MSTP, Fast Linkover
 
IGMP snooping
IGMP (versions 1 and 2) snooping provides for fast client joins and leaves of multicast streams and limits bandwidth-intensive video traffic to only the requestors
 
QoS
Priority levels - 4 hardware queues
Scheduling - Priority queuing and weighted round-robin (WRR)
 
Class of service
• Port based
• 802.1p VLAN priority based
• IPv4 IP precedence/ToS/DSCP
• TCP/UDP port

VLAN
• Port-based and 802.1Q-based VLANs
• Management VLAN

Head-of-line (HOL) blocking - HOL blocking prevention
 
Jumbo frame - Supports frames up to 10 KB
 
Standards
• 802.3 10BASE-T Ethernet
• 802.3u 100BASE-TX Fast Ethernet
• 802.3ab 1000BASE-T Gigabit Ethernet
• 802.3z Gigabit Ethernet,
• 802.3x flow control
 
Dimensions W x H x D: 17.32 x 1.75 x 13.7 in. (440 x 44 x 348 mm)
Unit weight: 11.42 lb (5.18 kg)
Power: 100-240V 0.5A
 
Certification: FCC Part 15 Class A, CE Class A, UL CSA (CSA22.2), CE mark, CB
Operating temperature: 32 to 122F (0 to 45C)
Storage temperature: -4 to 158F (-20 to 70C)
Operating humidity: 20% to 95%
Storage humidity: 5% to 90% noncondensing
 
Package Contents

• Cisco SRW248G4P 48-Port 10/100 + 4-Port Gigabit Switch
• AC power cord
• Rack-mounting kit with brackets and hardware
• CD with user guide in PDF format
• Online registration card
• Console cable

Minimum Requirements

• Web-based utility: Microsoft Internet Explorer (version 5.5 or later)
• Category 5 Ethernet network cable
• Operating system: Windows 2000, XP, or later

Product Warranty
5-year limited hardware warranty with return to factory replacement and 90-day limited software warranty