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Product features:
Stackable 24-Port 10/100 Switch + 2combo Gig copper/SFP uplinks
EOL
General features:

Number of Ports
- DES-3526/DES-3526DC: 24 10/100BASE-TX ports, 2 combo 1000BASE-T/SFP
- DES-3550: 48 10/100BASE-TX ports, 2 combo 1000BASE-T/SFP

Port Standard/Function Support
- IEEE 802.3 10BASE-T/802.3u 100BASE-TX
- IEEE 802.3ab 1000BASE-T/802.3z 1000BASE-SX/LX
- ANSI/IEEE 802.3 NWay auto-negotiation
- IEEE 802.3x Flow Control
- Auto MDI/MDIX
- Port mirroring

SFP Support
- IEEE 802.3z 1000BASE-LX (DEM-310GT transceiver)
- IEEE 802.3z 1000BASE-SX (DEM-311GT transceiver)
- IEEE 802.3z 1000BASE-LH (DEM-314GT transceiver)
- IEEE 802.3z 1000BASE-ZX (DEM-315GT transceiver)

Topology
Supports Ring and Star Topologies

Software
VLAN

- IEEE 802.1Q Tagged VLAN
- Port-based VLAN
- GARP/GVRP
- Maximum number of VLANs per device: 255 VLANs (static and dynamic combined)

Priority Queues (CoS)
- Standard: IEEE 802.1p
- Number of queues: 4

Traffic Classification (CoS)
Can be based on user-definable application types:
- TOS
- Diffserv (DSCP)
- Port-based
- MAC address
- IP address
- TCP/UDP port number

Access Security
- Port security (20 MAC addresses max.)
- 802.1x port-based access control
- 802.1x MAC-based access control
- SSH v.1, v .2
- SSL
- Per port traffic segmentation (with or without VLAN tag)
- IP-MAC binding: 512 entries

Access Control List
Multi-layer ACL based on:

- Port number
- TOS
- Diffserv (DSCP)
- MAC address
- IP address
- Packet protocol type
- TCP/UDP port number (user-definable application types)
- TCP/UDP payload (user-definable packet content)
- Per port ACL definition

Spanning Tree Protocol
- 802.1D Spanning Tree compatible
- 802.1w Rapid Spanning Tree
- 802.1w Rapid Spanning Tree, provides ring protection for network recovery time of less-than 15 sec.
- Per port BPDU filter

IP Multicast

- IGMP Snooping
- IGMP v.3
- IGMP Snooping (128 Groups Max.)
- Enable definite VLAN for Multicast
- IGMP Fast Leave
- User-definable per -port IP multicast range limit

Port Trunk
- Maximum number of ports per trunk: 8
- Maximum number of trunks per device: 6
- Operation mode: load sharing
- 802.3ad compatible Link Aggregation (LACP) static & dynamic modes on uplink and downlink ports for traffic load balance and redundancy

Performance Enhancement Functions
- Traffic segmentation
- Bandwidth control from 1Mbps to the port's maximum rate (in steps of 1Mbps)

Scheduling Mechanism
Strict priority based and weighted fair queuing

Bridging
Transparent Bridging

Performance
Switch Fabric
- DES-3526/DES-3526DC: 8.8Gbps
- DES-3550: 13.6Gbps

Packet Forwarding Rate
- DES-3526/DES-3526DC: 64 Byte system packet forwarding rate, can reach 6.6 Mpps
- DES-3550: 64 Byte system packet forwarding rate, can reach 10.1 Mpps

Transmission Method
Store-and-forward

MAC Address Table
- DES-3526/DES-3526DC: 8K entries per device
- DES-3550: 8K entries per device

MAC Address Learning
- Dynamic entries: automatic update
- Static entries: user-defined
- 8K MAC addresses for addressing learning, VLAN identification and configuration

Packet Buffer Memory
- DES-3526/DES-3526DC: 16Mbytes per device
- DES-3550: 64Mbytes per device

Configuration & Management
Management Support

- Single IP Management v.1
- Web-based MAC address browsing
- CLI (command line interface)
- RMON monitoring
- Telnet server (up to 8 sessions)
- TACACS+ authentication on switch admin access
- RADIUS authentication on switch admin access
- SYSLOG
- DNS relay
- Dual Images
- Back-Door function
- Web GUI traffic monitoring
- Web MAC address browsing
- Port description
- CPU utilization monitoring
- RFC 2030 SNTP (Simple Network Time Protocol)
- CIT and NMS interface (through SNMP protocol)
- SNMP v.1 (RFC 1 157), v.2c, v .3 agent
- VT-100 CLI (command line interface)
- DHCP/Bootp Relay and DHCP Relay Agent Option 82 feature
- Network management through Ethernet interface
- Enable/disable Telnet, web, SNMP remote management
- Web-based management for port status viewing
- Switch configuration can added, removed, checked and modified
- Supports setting of multi-ports at the same time
- NVRAM to store firmware and configuration, upgrading by
TFTP protocol remotely
- RFC 3164 Syslog remote upload by three different levels

MIBs
- 802.1Q Q-BRIDGE-MIB (RFC 2674)
- 802.1p P-BRIDGE-MIB (RFC 2674)
- MIB-II (RFC 1213)
- Bridge MIB (RFC 1493)
- RMON MIB (RFC 1757)
- IGMP MIB (RFC 2833)
- IF MIB (RFC 2233)
- Ethernet-like MIB (RFC 1643)
- PING-MIB and TRACEROUTE-MIB (RFC 2925)
- ICMP Ping by MIB
- Rate limiting by MIB
- Save configuration by MIB
- 802.1w setting and read by MIB
- Port interface MIB-II trap (RFC 1215)
- D-Link enterprise MIB

RMON Groups
1, 2, 3, 9 (Alarm, Statistics, History, Event)

IP Number Self-identification
Through DHCP client, Bootp client

Firmware Upgrade
Provides NVRAM to store firmware and configuration, remote upgrade by TFTP protocol

Console Port
DB-9 RS-232 DCE



LED Indicators
Per Device:
- Power
- Console
- RPS
Per Port:
- 10/100Mbps
- GE
-Enable/Disable

Power Supply

- DES-3526/3550: 100 to 120; 200 to 240 VAC, 50/63Hz Internal power supply
- DES-3526DC: 36 to 75VDC, 3A Internal power supply

Redundant Power Backup Support
Connector to external RPS (DES-3526/DES-3550 only)

Power Consumption
- DES-3526/DES-3526DC: 23 watts (max.)
- DES-3550: 40 watts (max.)

Ventilation
- DES-3526/DES-3526DC: 40mm x 40mm DC fan x 1
- DES-3550: 40mm x 40mm DC fan x 2

Dimensions
- DES-3526/DES-3526DC: 441 x 207 x 44 mm (device only)
- DES-3550: 441 x 309 x 44 mm (device only)
19-inch rack-mount width, 1U height

Weight
- DES-3526: 2.56 kg (device only)
- DES-3526DC: 2.5kg (device only)
- DES-3550: 4.4 kg (device only)

Operating Temperature
0 to 40 C

Storage Temperature
-40 to 70 C

Operating Humidity
5% to 95% non-condensing

Emission (EMI)
- FCC Class A
- CE Class A
- C-Tick

Safety
CSA International

Telecom Compliance
ETSI

MTBF
4 years

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