D-Link | xStackTM DGS-3300 | D-Link 10-Gigabit Ethernet

D-Link 10-Gigabit Ethernet
Standardized Solutions for Maximizing Bandwidth and
Enabling Storage and Computing Technologies
White Paper
July, 2007
Bandwidth intensive applications, VoIP, OS virtualization, cluster computing, video and audio proliferation, and high-performance back-up
solutions are all driving the charge for higher capacity networking. There’s also a push to simplify networks and reduce connectivity costs
– all while maintaining reliability and decreasing latency. Fortunately, network bandwidth doubles approximately every two years. Gigabit
Ethernet, for example, is now maturing and making way for 10Gigabit Ethernet (also referred to as 10GbE or IEEE 802.3ae), which was
introduced in 2002.
10GbE, which increases capacity by a factor of 10 over Gigabit Ethernet, easily connects to existing Ethernet equipment, enables network/
server consolidation and clustering virtualization, and offers copper technology specifically designed for upgrading short-range links.
A 10GbE solution is particularly compelling in SAN/NAS disaster recovery and business continuity environments, where expensive Fiber
Channel links can be replaced while unifying the entire network on Ethernet.
10GbE and iSCSI technology can act as high-speed trunk lines where multiple GbE clients access the SAN, for example – supporting disaster
recovery and business continuity initiatives. In departmental scenarios, this option is a very compelling alternative to Fibre Channel switches.
Existing Ethernet skill sets ensure that training and implementation costs are minimized. There is no additional technology to learn and no
new expertise necessary.
This white paper explains 10GbE solutions for fiber optic links as well as copper, summarizes market drivers, examines some of the more
common applications, and details D-Link’s new low-cost 10GbE local area and wide area solutions.
D-Link 10-Gigabit Ethernet
10-Gigabit Ethernet – Low-Cost, High-Speed
Data Transfer
As demand for network bandwidth continues, 10GbE is poised to
profoundly impact the networking landscape and add a muchneeded performance boost across Local Area Networks, Wide Area
Networks and Metropolitan Area Networks – LANs, WANs and MANs.
10GbE offers standardized Ethernet technology that fits neatly into
existing architectures and super-charges a variety of IT applications,
from supercomputing to networked storage. Essentially, 10GbE
enables high-speed data transfer at low cost. As 10GbE spreads,
high-bandwidth, low-latency applications as well as converged
voice, video, and data networks will flourish and excel far beyond
current end-user performance expectations.
10GbE is already displacing slower switches in the LAN and SAN
markets. At 10 times the speed of Gigabit Ethernet, the technology
is considered a major, “disruptive” advance. Blade servers are now
being manufactured with 10GbE I/O backplanes, Fibre Channel links
are being replaced by cheaper 10GbE gear, and server-to-server
links inside data centers are being augmented with short-run copper
CX4 10GbE links (see definitions below). Buyers can choose between
optical fiber (XFP) and copper (CX4 ) modules for connecting to
10GbE switches. CX4 modules provide a cost effective solution for
short-run (15 meters or less) 10GbE rack-to-rack or box-to-box
10GbE technology also plays a key role in computer clustering. The
standard now contends with InfiniBand for the high-speed links
that connect groups of computers into a single, virtual machine.
These clusters challenge supercomputer performance at a fraction
of the cost.
Perhaps most compelling is the fact that 10GbE offers an elegant,
consolidated solution for fragmented, competing networking
standards that complicate network management. With 10GbE, you
no longer need parallel networks for storage, virtualization and
consolidation projects. Everything returns to the single Ethernet
networking standard, which allows for excellent scalability, reduced
knowledge set and training, and a clear path for performance
upgrades across existing enterprise networks.
Applications and Market Drivers
Faster CPU clock rates and storage technology have been driving
data center expansion, consolidation projects and performance
upgrades. Simply put, more bandwidth is needed to move data in
and out of data centers and between the various servers within
them. As a result, analysts see no end in sight for 10GbE growth at
the corporate backbone and beyond.
Gigabit Ethernet prices have dropped off precipitously over the past
two years, and most 10/100-Ethernet switches now leverage Gigabit
July, 2007
uplinks. In addition, high-performance PCs include integrated
Gigabit Ethernet connectivity. The network is scaling for maximum
throughput and the fattest pipes at every juncture. While Gigabit
Ethernet used to be limited to 5 kilometers between campuses, new
10GbE transponders now cover up to 40 kilometers.
This is a noteworthy development for enterprises like movie
production studios, video editing companies, sophisticated
engineering and design firms and the like. With wide area Gigabit
Ethernet on the desktop and 10GbE connectivity across campuses,
transfer rates for huge files become trivially insignificant. Video
surveillance applications that require high bandwidth and multi-core
CPUs to keep up with data transfers benefit, as well.
As demand for Gigabit Ethernet grows, service providers have been
extending infrastructure, servers and even client devices that can
handle GbE to the metro edge. The problem is that a single fiber
is restricted to one Gigabit throughput unless expensive Dense
Wavelength Division Multiplexing (DWDM) equipment is employed
to multiplex the Gigabit feeds. With 10GbE, 10Gb throughput is
achieved at a much lower cost, offering additional capacity where
With 10GbE you enable the following benefits:
• Low-cost,
Low-cost, high-speed Ethernet access to the metropolitan optical
• 10Gb
10Gb metro campus interconnects over dark fiber (up 40 km)
• Simple,
Simple, end-to-end connectivity with familiar Ethernet
management systems
Server Farms
Some organizations are developing huge server farms that spread
across multiple locations and are interconnected using GbE and
10GbE. The result is a massive virtual supercomputer. By using OS
virtualization, they consolidate applications and enable stunning
performance and computational leverage. The problem is that I/O
bottlenecks for LAN traffic and storage inevitably arise. 10GbE solves
this dilemma by adding capacity and alleviating congestion across
the system.
Blade Servers & 10GbE
Blade servers are now integrating 10GbE with rack management
systems. IBM’s BladeCenter, for example, works with 10GbE
switches. These systems are priced at less than $500 per port.
10GbE solutions (using twisted pair wires and RJ-45 connectors) are
expected in 2008-2009. D-Link plans to participate in this market
once the technologies become standardized and have traction. As
these advances unfold, growth of 10GbE will continue to accelerate.
D-Link 10-Gigabit Ethernet
Storage: Fibre Channel or iSCSI
10GbE technology enhances storage systems, acting as a highspeed trunk where multiple GbE clients access the SAN. Fibre
Channel switches can be replaced by standardized 10Gb Ethernet
and iSCSI, making life easier for IT and reducing the amount of
time and money spent on training and network maintenance. Since
networking staffs are already well-versed in Ethernet and TCP/IP,
10Gb/iSCSI can be rapidly implemented. Fibre Channel experience,
however, is not as prevalent, so training and project launches are
usually much more challenging.
Disaster recovery and business continuity initiatives can easily
be supported by 10GbE. Terrorism, natural disasters and ongoing
reliance on mission critical IT systems will continue to drive DR and
business continuity growth. 10GbE offers an elegant solution with
low costs, the ability to use existing implementation skill-sets, and
open flexibility based on the Ethernet standard.
Like common Ethernet deployment, 10GbE requires Ethernet
switches and Network Interface Cards (NICs) plus modules (or
adapters) that interface with existing switches where necessary.
D-Link xStackTM 3300 and 3200 series switches support CX4 and
XFP modules, for example (without the modules, the switches are
high-performance gigabit stackables). The type of connection used
depends on cabling distance. CX4 (copper) modules can be used
if the interconnect distances are less than 15m. This is the most
cost-effective technique for short runs. XFP modules can be used
for longer distances. These come in short, long, and extra long reach
versions (300m, 10Km and 40Km). Since 10GbE uses the standard
Ethernet MAC protocol, equipment can be deployed using star or
ring topologies. Newer 10GbE switches deliver network reliability
similar to Sonet/SDH rings.
D-Link Solutions
D-Link offers low-cost 10GbE solutions with all the benefits and
advantages discussed above. With D-Link 10GbE switches and
modules, enterprises and service providers can upgrade existing
LANs and SANs without adding expensive Fibre Channel equipment
or a third type of network like InfiniBand. Standard Ethernet
protocols ensure that existing personnel can manage the new
network using traditional Ethernet skill sets. No additional training is
D-Link solutions feature:
• Low total cost-of-ownership (equipment, management/
maintenance, personnel)
• Linear, standards-based migration migration path to 100GbE
and beyond
• Proven multi-vendor and installed-base interoperability
• Familiar network management feature set
July, 2007
D-Link offers both CX4 and fiber XFP uplink modules, so customers
can implement short-run linking solutions at very low cost with
copper or longer, high-performance links with fiber. The modules
work interchangeably with D-Link xStack 3300 and 3200 switches.
Customers can flexibly choose the right technology for their
individual needs.
D-Link Products
Currently D-Link offers two 10GbE switches, five modules for
XFP applications of varying length, and one module for short-run
copper (CX4) applications. The products are described briefly below.
Additional information and specifications are available at http://
www.dlink.com/. We plan on adding new solutions as the market
xStack DXS-3350SR
D-Link’s xStack Switches are a series of “Next Generation” high
performance stackable switches that deliver high scalability, wirespeed Gigabit performance, high availability, integrated 10-Gigabit
stacking, redundant power options, and the option to stack in a ring
or star topology.
The xStack DXS-3350SR stacks up to 8 units, providing up to 384
Gigabit ports, and up to 40Gbps of stacking bandwidth. It supports
an optional module for an additional 2 ports of either 10 Gigabit
fiber XFP ports (DEM-420X) or 10 Gigabit copper CX-4 (DEM-420CX)
for uplinking to servers, storage, or backbone switches. The DXS3350SR stacks with other xStack switches like the DGS-3324SR,
DGS-3324SRi, and DXS-3326GSR, providing unprecedented
flexibility. It features 48 built-in copper Gigabit ports, including (4)
Combo SFP ports supporting either copper links or SFP transceivers
for easy, flexible connection to fiber-based Gigabit media and a
switching capacity of up to 176Gbps per switch.
xStack DXS-3326GSR
The xStack DXS-3326GSR stacks up to 12 units in a stack, providing
up to 288 Gigabit fiber slots, up to 40Gbps of stacking bandwidth in
ring mode, and a switching capacity of up to 128Gbps per switch.
The switch supports an optional module to provide an additional 2
ports of either 10 Gigabit fiber XFP (DEM-420X) or 10 Gigabit copper
CX-4 (DEM-420CX) for uplinking to servers, storage, or backbone
switches. It features 24 Gigabit fiber slots, including (4) 10/100/1000
combo copper ports and stacks with the other xStack switches
including the DGS-3324SR, DGS-3324SRi, and DXS-3350SR,
providing unprecedented flexibility.
xStack DXS-3250
The DXS-3250 is an advanced high-density stackable Layer 2 switch
supporting (48) 10/100/1000Base-T interfaces, 4 Combo SFP fiber
uplinks, and two optional 10-Gigabit Copper CX-4 or fiber XFP
ports. With an optional firmware upgrade the DXS-3250 transforms
D-Link 10-Gigabit Ethernet
into a ‘Wireless-Ready’ switch capable of providing centralized
AP management, seamless roaming between APs, and enhanced
wireless security with rogue AP detection and jamming. The DXS3250 enables up to 16 units to be stacked at up to 48Gbps creating
a single IP managed solution. The DXS-3250 also supports advanced
security through preconfigured ACLs that detect and filter out known
network threats such as DoS attacks, Trojans, Worms and more.
xStack DXS-3227
The DXS-3227 is an advanced stackable Layer 2 switch supporting
(24) 10/100/1000Base-T interfaces, 4 Combo SFP fiber uplinks, two
optional 10-Gigabit Copper CX-4 or fiber XFP ports, and (1) built-in
XFP interface. With an optional firmware upgrade the DXS-3227
transforms into a ‘Wireless-Ready’ switch capable of providing
centralized AP management, seamless roaming between APs, and
enhanced wireless security with rogue AP detection and jamming.
The DXS-3227 enables up to 32 units to be stacked at up to 48Gbps
creating a single IP managed solution. The DXS-3227 also supports
advanced security through preconfigured ACLs that detect and filter
out known network threats such as DoS attacks, Trojans, Worms
and more.
xStack DXS-3227P
The DXS-3227P is a 24-port PoE capable stackable Gigabit Layer
2+ switch that supports 4 Combo SFP ports, 2 optional 10 Gigabit
fiber or copper uplinks, and 1 built in fiber 10G XFP interface.
It supports static routing and resilient failover stacking with a
stacking bandwidth of up to 48Gbps. With the purchase of an
optional wireless switching key, the DXS-3227P can to support
centralized AP management, wireless roaming, & rogue AP
detection and containment. Enhanced security includes the ability
to automatically detect and block know threats such as Trojans,
Worms, and DoS attack. The DXS-3227P supports IEEE 802.3af PoE
at full power on all ports simultaneously with per port power ratings
up to 16.8 Watts.
XFP Modules/Transceivers
The D-Link DEM-422XT is a high performance 1310nm Single-Mode
XFP transceiver that supports distances up to 10,000 meters (10Km)
in Full-duplex, with 10-Gigabit speeds on Single-Mode fiber cables.
The unit is 802.3ae 10GBASE-LR compliant and supports Full-duplex
802.3x Flow control. It provides the necessary signal amplification
for data to be transmitted to the network cable from the port, and
vice versa. The DEM-422XT is hot swappable, so you can remove
or replace the transceiver with the system powered on. This
permits modules and transceivers to be added or swapped without
interrupting network systems.
July, 2007
The D-Link DEM-421XT is a high performance 850nm Multi-Mode
XFP transceiver that supports distances up to 300 meters. It
supports Full-duplex, 10Gigabit speeds on Multi-Mode fiber cables.
The DEM-421XT is 802.3ae 10GBASE-SR compliant and supports
Full-duplex 802.3x Flow control. The unit provides the necessary
signal amplification for data to be transmitted to the network cable
from the port, and vice versa. The DEM-421XT is hot swappable, so
you can remove or replace the transceiver with the system powered
on. This permits modules and transceivers to be added or swapped
without interrupting network systems.
The DEM-420X is a module with 2 XFP slots for 10-Gigabit pluggable
transceivers. It is designed for D-Link’s two xStack members, the
DXS-3550SR and DXS-3326GSR. When the DEM-420X is plugged
into the switch, it provides 2 uplink XFP 10-Gigabit ports for
connections to the switches, each module providing a whopping
bandwidth of 20-Gigabit with two appropriate XFPs. Designed to
alleviate any bottlenecks that might occur at the access core, the
DEM-420X is targeted for use as an uplink to servers, or backbone
switches in medium to large size businesses. The DEM-420X
includes an informative LED-Light indicator displaying 10-Gigabit
mode link and activity. When using D-Link’s XFPs, each transceiver
can be removed or added without powering down the switch,
enabling network management without any down time.
The DEM-411X is a 1-port 10-Gigabit XFP Module for the xStack
3200 Series switch. The DEM-411X is fully IEEE 802.3ae compliant
and supports data transfer at full duplex for congestion-free data
transport. The DEM-411X can be mixed and matched with the DEM411T (10-Gigabit CX4 module) to provide both 10-Gigabit copper and
fiber interfaces on a single switch chassis. The DEM-411X supports
industry standards, and it may be compatible with 3rd party XFP
transceivers. The DEM-411X can be used to interconnect switches,
uplink to servers or provide a clean fiber bandwidth channel for SAN
and other network storage devices. For a complete solution, the DLink DEM-421XT 10Gbase-SR XFP can be added for fiber runs over
multi-mode cabling up to 300 meters. If longer hauls are required,
D-Link offers the DEM-422XT single-mode 10Gbase-LR XFP capable
of distance runs up to 10Km.enabling network management without
any down time.
The DES-6512 is a 2-port 10Gig XFP card for the DES-6500 chassis.
It uses standards-based IEEE 802.3ae 10-Gigabit XFP modules
to meet the demands of today’s Enterprise and Service Provider
networking infrastructure. The DES-6512 is the perfect solution for
uplinking to servers, storage, or department level switches such as
D-Link’s xStack DXS-3200 series. Fiber media allows for increased
D-Link 10-Gigabit Ethernet
distances over copper cabling. When used with D-Link’s DEM-422XT
XFP fiber module a total distance of up to 10Km can be reached.
This is often necessary when running across larger distances such
as campus or multi-building environments. If shorter distances are
required, the DEM-421XT module from D-Link provides 10-Gigabit
Multimode at distances of up to 300 meters.
The D-Link DEM-420CX is a 2-port 10-Gigabit copper CX-4 uplink
module for the xStack 3300 series DXS-3326GSR and DXS-3350SR
switches. The DEM-420CX offers an affordable, 10-Gigabit uplink
option using copper CX-4 cable for distances up to 20 meters. This
module is designed for connecting nearby servers, Network Attached
Storage devices, and switches. The DEM-420CX is equipped with
embedded transceivers, eliminating the need for users to purchase
additional costly fiber XFP transceivers. The module slides into the
back of the DXS-3350SR or DXS-3326GSR and provides two 10Gigabit CX-4 ports. Each of these ports is capable of up to 20Gbps in
full duplex for a total combined uplink capacity of 40Gbps.
The DEM-411T is a 1-port full-duplex 10 Gigabit CX-4 Module for
the xStack 3200 Series switch. CX-4 is a cost effective means of
transporting data over short distances at speeds up to 10Gbps. The
DEM-411T is designed to provide up to 12Gbps of bi-directional
bandwidth when used as a stacking interface while connected to
an xStack 3200 Series switch. The DEM-411T is also IEEE 803.2ak
compliant and will operate at a standard 10Gbps when used to
uplink to another 802.3ak CX-4 compliant device such as a SAN
or Server NIC. The DEM-411T can be mixed and matched with
the DEM-411X (10Gigabit XFP module) to provide both 10Gigabit
copper and fiber interfaces on a single switching chassis. It is
self-contained and does not require the purchase of an additional
transceiver to function.
The DSN-3400 features a 10Gbit iSCSI System-on-a-Chip (SoC)
solution that can handle over 65,000 I/Os per second. It is capable
of supporting over 11TB raw capacity using 750GB hard drives (and
even higher capacity hard drives as they are introduced). The array
can easily be implemented as nearline storage to supplement your
primary IP network storage solution. It can also be used as a basic
backup and recovery device. By utilizing existing Ethernet and iSCSI
technology, the DSN-3400 reduces costs associated with separate
host bus adapters. Per-Gigabyte cost for storage is significantly
reduced. IP SANs based on iSCSI technology can leverage existing
and familiar Ethernet standards to provide speeds of up to
1160MBytes bandwidth with the DSN-3400.
10GbE – The New Standard for Raising Service Levels, Boosting
Network Performance and Reducing the Cost of Connectivity
As growth of 10GbE networks continues, everyone benefits – from
the end-user to the data center to the service provider. Increasing
worldwide Web usage, sophisticated Rich Internet Applications
(RIAs) and new forms of clustered computing are all driving
capabilities and performance demands to higher levels. The 10GbE
market is entering an expansion phase, so equipment prices and
rapid adoption will continue the ongoing trend of breakthroughs.
Be prepared for more network productivity and efficiency,
communication expansion, and creative integration.
For more information about D-Link 10GbE solutions and related
equipment, please call 1-888-XSTACK1 or visit www.dlink.com/xStack.
The D-Link® xStack Storage Area Network (SAN) Array DSN-3400
offers entry-level and SMB customers a reliable network data
storage solution. The DSN-3400 provides the industry’s first builtin, fully integrated 10GbE interface in the XStack™ cost effective
July, 2007
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