Gigabit Smart Switch
TM
DGS-1248T
48-Port Copper Gigabit Smart Switch
With 4 Combo SFP
The DGS-1248T copper Gigabit Smart Switch presents a cost-effective solution for business to implement Gigabit Ethernet
packet switching with easy fine-tuning of network performance and security. This switch comes with a high port density of 48
10/100/1000BASE-T Gigabit ports, plus 4 combo SFP in a low profile rack-mountable housing. Port trunks are provided for
server deployment and network backbone attachment, while functions important for bandwidth-intensive applications such as
Priority Queues and VLANs are supported to enable you to implement Quality of Service (QoS) and security without having to
go through complex network management usually found in other managed switches.
High Density With 48 Copper Gigabit Ports
48 1000BASE-T ports provide an inexpensive alternative
confining intra-group traffic within their segments. To
solution to the fiber-optic. Using your existing low-cost Cat.
segment up the network, VLAN-supported workstations and
5 copper twisted-pair wires as the transmission media, these
servers that are connected to the switch can be grouped into
ports allow you to instantly upgrade your servers to Gigabit
different Virtual LANs (VLANs).
capability without requiring you to install new, expensive
fiber cables. All ports support 10/100/1000Mbps network
Quality of Service Support
speed auto-sensing, full/half duplex auto-negotiation and
The switch supports Layer 2 802.1p Priority Queue control
auto MDI/MDIX plug-and-play.
to prioritize network packets. Classification of users' data
priorities can be based on a data packet Priority Queue. This
4 Combo SFP for Flexible Fiber Connection
QoS function support allows you to run bandwidth-intensive
4 combo SFP are provided for flexible fiber connection. You
and delay-sensitive applications and to attach video servers
can select to install optional transceiver modules in these
to the switch for videoconference.
slots for short, medium or long-distance fiber backbone
attachment. Use of the SFP will disable their corresponding
Port Mirroring
built-in 10/100/1000BASE-T connections.
The switch supports port mirroring to assist network traffic
monitoring. The network administrator can use this function
Port Trunks for Aggregated Bandwidths
as a diagnostic tool or debugging feature, especially when
Ports can be combined together to create multi-link load-
fending off an attack. It enables you to keep close track of
sharing aggregated bandwidths to a server or a network
switch performance and alter it if necessary.
backbone. To expand the network, you can also make use of
the port trunks to eliminate bottlenecks between the
Network Management/Monitoring
cascaded switches. The switch allows you to combine
The switch provides easy web-based switch configuration
multiple ports into a trunk, and to create multiple trunks per
and network management/monitoring from any networked
switch.
station that does away with the need for consoles and
console cables. Network devices are auto-discovered and
VLANs for Enhanced Security & Performance
displayed on a network topology, and you can receive traps
The switch support VLANs to let you improve security and
of system events and port errors while monitoring the
bandwidth utilization by limiting the broadcast domains and
network status and statistics from any workstation.
Features
48 10/100/1000BASE-T ports for copper Gigabit
Port trunks for server/network backbone attachments
connection
802.1Q VLAN to enhance security/network performance
4 combo SFP for flexible fiber Gigabit connection
802.1p Priority Queues, port-based QoS
Auto MDI/MDIX cross over for all twisted-pair ports
Easy web-based switch configuration/management and
802.3x Flow Control for protection against data loss
network monitoring
Port mirroring for traffic monitoring
Standard rack-mount size
DGS-1248T
Technical Specifications
Gigabit Smart Switch
General
Physical & Environmental
Port Standards & Functions
AC Input
- IEEE 802.3 10BASE-T Ethernet (twisted-pair copper)
100 to 240 VAC 50/60Hz internal universal power supply
- IEEE 802.3u 100BASE-TX Fast Ethernet (twisted-pair copper)
- IEEE 802.3ab 1000BASE-T Gigabit Ethernet (twisted-pair copper)
Power Consumption
- ANSI/IEEE 802.3 NWay auto-negotiation
68.88 watts (max.)
- IEEE 802.3x Flow Control
- Port mirroring
Ventilation
40 x 40 mm DC fans x 4
Number of Ports
- 48 10/100/1000BASE-T ports
Operating Temperature
- 4 combo SFP *
o
o
0 to 40 C
* Use of the SFP will disable their corresponding 10/100/1000BASE-T connections.
Storage Temperature
o
o
-10 to 70 C
SFP Support
- IEEE 802.3z 1000BASE-SX multi-mode fiber (DEM-311GT transceiver)
Operating Humidity
- IEEE 802.3z 1000BASE-SX multi-mode fiber (DEM-312GT2 transceiver)
10% to 90% non-condensing
- IEEE 802.3z 1000BASE-LX single-mode fiber (DEM-310GT transceiver)
- IEEE 802.3z 1000BASE-LH single-mode fiber (DEM-314GT transceiver)
Storage Humidity
- IEEE 802.3z 1000BASE-ZX single-mode fiber (DEM-315GT transceiver)
5% to 90% non-condensing
- IEEE 802.3ab 1000BASE-T Cat. 5 twisted-pair (DGS-712 transceiver)
Dimensions
Protocol
441 (W) x 309 (D) x 44 (H) mm (device only)
CSMA/CD
19-inch standard rack mounting size
Data Transfer Rates
Weight
- Ethernet:
4.4 kg (device only)
10Mbps (half duplex)
20Mbps (full duplex)
Emission (EMI)
- Fast Ethernet:
- FCC Class A
100Mbps (half duplex)
- CE Class A
200Mbps (full duplex)
- C-Tick
- Gigabit Ethernet:
2000Mbps (full duplex)
Safety
UL
Topology
Star
Network Cables
- UTP Cat. 5, Cat. 5e (100 m max.)
- EIA/TIA-568 100-ohm STP (100 m max.)
Full/half Duplex
Ordering Information
- Full/half duplex for 10/100Mbps speeds
- Full duplex for Gigabit speed
Gigabit Smart Switch
Media Interface Exchange
DGS-1248T
24 10/100/1000BASE-T ports, 4 combo SFP
Auto MDI/MDIX adjustment for all twisted-pair ports
Optional SFP Transceiver
LED Indicators
DEM-310GT
1000BASE-LX SFP transceiver, single-mode fiber,
- Per device: Power/CPU
max. distance 10km, 3.3V
- Per 10/100/1000BASE-T port: Link/Act, 100/1000Mbps Speed
DEM-311GT
1000BASE-SX SFP transceiver, multi-mode fiber,
- Per SFP: Link/Act
max. distance 550m, 3.3V
DEM-312GT2
1000BASE-SX SFP transceiver, multi-mode fiber,
Software
max. distance 2km, 3.3V
DEM-314GT
1000BASE-LHX SFP transceiver, single-mode fiber,
VLAN
max. distance 50km, 3.3V
- 802.1Q VLAN Tagging
DEM-315GT
1000BASE-ZX SFP transceiver, single-mode fiber,
- Maximum 64 VLANs per device
max. distance 80km, 3.3V
DGS-712
1000BASE-T SFP transceiver, Cat. 5 twisted-pair,
Quality of Service (QoS)
Max. distance 100m, 3.3V
- 802.1p Priority Queues
- Maximum number of queues: 2
Port Trunks
- 2 or 4 10/100/1000BASE-T port links per trunk
- Up to 3 trunks per switch
Management & Configuration
Specifications subject to change
U.S.A
TEL: 1-714-885-6000
FAX: 1-866-743-4905
without prior notice.
- Web-based configuration
D-Link is a registered trademark and
Canada
TEL: 1-905-8295033
FAX: 1-905-8295223
SmartSwitch is a trademark of
- Windows-based utility
Europe
TEL: 44-20-8731-5555
FAX: 44-20-8731-5511
D-Link Corporation/D-Link System Inc.
Germany
TEL: 49-6196-77990
FAX: 49-6196-7799300
- Configuration reset through software or hardware (reset button)
All other trademarks belong to their
proprietors.
France
TEL: 33-1-30238688
FAX: 33-1-30238689
Netherlands
TEL: 31-10-282-1445
FAX: 31-10-282-1331
Belgium
TEL: 32(0)2-517-7111
FAX: 32(0)2-517-6500
Performance
Italy
TEL: 39-2-2900-0676
FAX: 39-2-2900-1723
Switch Capacity
Iberia
TEL: 34-93-4090770
FAX: 34-93-4910795
88Gbps
Sweden
TEL: 46-(0)8564-61900
FAX: 46-(0)8564-61901
Norway
TEL: 47-22-309075
FAX: 47-22-309085
Denmark
TEL: 45-43-969040
FAX: 45-43-424347
Transmission Method
Finland
TEL: 358-9-2707-5080
FAX: 358-9-2707-5081
Store-and-forward
Singapore
TEL: 65-6774-6233
FAX: 65-6774-6322
Australia
TEL: 61-2-8899-1800
FAX: 61-2-8899-1868
MAC Address Table
Japan
TEL: 81-3-5434-9678
FAX: 81-3-5434-9868
8K entries per device
China
TEL: 86-10-8518-2533
FAX: 86-10-8518-2250
India
TEL: 91-022-652-6696
FAX: 91-022-652-8914
Middle East (Dubai) TEL: 9714-8834234
FAX: 9714-8834394
MAC Address Learning
Turkey
TEL: 90-212-335-2553
FAX: 90-212-335-2500
Automatic update
Egypt
TEL: 202-414-4295
FAX: 202-415-6704
Israel
TEL: 972-9-9715700
FAX: 972-9-9715601
Latinamerica
TEL: 56-2-232-3185
FAX: 56-2-232-0923
Packet Filtering/Forwarding Rates (half duplex)
Brasil
TEL: 55-11-55039320
FAX: 55-11-55039321
Maximum 1,488,095 pps per port
South Africa
TEL: 27(0)1266-52165
(
FAX: 270 )1266-52186
Russia
TEL: 7-095-744-0099
FAX: 7-095-744-0099#350
RAM Buffer
Taiwan
TEL: 886-2-2910-2626
FAX: 886-2-2910-1515
1.632MBytes per device
Rev. 01(Oct. 2004)
D-Link Corp.
TEL: 886-2-2916-1600
FAX: 886-2-2914-6299
Document Outline