Tag Archives: DAC Cable

SFP+ Cables And QSFP+ Cables Manufacturers

SFP+ Twinax Copper Cables

Active cables and passive cables. Active cables are copper cables for data transmission. They use silicon (semiconductor) to boost the performance of the cable. On the contrary, a cable without a chip is considered as a “passive cable”.

10Gb/s Passive Copper Cable used for very short link and lowest cost

  • Compliant to SFF-8431
  • SFP+ Multi‐Source Agreement and SFF-8461
  • SFP+ Copper Cable Multi‐Source Agreement
  • Up to 10m length (AWG24)

The SFP+ cables support 10G Ethernet, 8G Fibre Channel, 10G FCoE, 10G InfiniBand and various unified architecture link applications. SFP + cable is widely used in the top of the Rock switches and high-performance server for interconnection. Top of the Rock switch power consumption is less than 10GBASE-T ports switch. In the market waiting for more energy efficient 10GBASE-T switch, SFP + cables are more popular for at the Top of the Rock switch. 28 AWG and 24 AWG cables are available for DAC cables. The standard lengths for the sfp+ direct attach cable are 1m, 2m, 3m, 5m, 7m and 10m. Custom lengths are available upon request.

Fiberstore Provides Cisco Compatible SFP+ Twinax Copper Modules:

  • 10GBASE-CU SFP+ Cable 1 Meter, passive SFP-H10GB-CU1M
  • 10GBASE-CU SFP+ Cable 1.5 Meter, passive SFP-H10GB-CU1-5M
  • 10GBASE-CU SFP+ Cable 2 Meter, Passive SFP-H10GB-CU2M
  • 10GBASE-CU SFP+ Cable 2.5 Meter, Passive SFP-H10GB-CU2-5M
  • 10GBASE-CU SFP+ Cable 3 Meter, passive SFP-H10GB-CU3M
  • 10GBASE-CU SFP+ Cable 5 Meter, passive SFP-H10GB-CU5M
  • 10GBASE-CU SFP+ Cable 7 Meter, passive SFP-H10GB-CU5M
  • 10GBASE-CU SFP+ Cable 10 Meter, passive SFP-H10GB-CU5M
  • 10GBASE-CU SFP+ Cable 7 Meter, active SFP-H10GB-ACU7M
  • 10GBASE-CU SFP+ Cable 10 Meter, active SFP-H10GB-ACU10M

Fiberstore SFP+ Cables

SFP+ fiber cable solution is suitable for longer distance communication, while 10G SFP+ cables solution is best when utilized in short lengths, typically 15m or less, which is sufficient to link server cards and switches. But at present, the fiber and copper cable transmission standard of 10G Ethernet have been launched. However, there is only the fiber standard without copper standard for the 40G Ethernet transmission now.

QSFP+ cables and SFP+ cables

From the perspective of the development of wiring, generally, the standard of copper cable is always behind the fiber standard and the application standard. Currently, the TIA and ISO have already established a working group to carry out the research work of the copper standard.

Actually, the QSFP+ cable is a choice for short transmission distance. Generally, QSFP+ cables are used to connect the ToR switches.

40GBASE QSFP+ Cable

Fiberstore QSFP+ Cables

QSFP+ cables and SFP+ cables are both suitable for the short transmission distance. The fiber can be considered for the long transmission distance. The standard distance of OM3 multi-mode fiber is 100m and the OM4 is 50m. The single-mode fiber will not encounter the problem of transmission distance. Fiberstore provides qsfp 4x10g aoc7m.

qsfp 4x10g aoc7m cable

Fiberstore qsfp 4x10g aoc7m cable

For the high-density, high-performance, longer distance and high-speed and other requirements, the MPO/MTP will be a more reasonable choice.

Fiberstore is a leading company in developing and manufacturing advanced optical network solutions to the fiber optic network, CWDM/DWDM system, and Data Center system. Fiberstore always aims accurate lead time and best service with high quality products to customers. Today, Fiberstore offer customers a broad range of data Center networking and communication solutions in following categories: GBIC, SFP, SFP+, XFP, XENPAK, X2, QSFP+ 40G AOC/ACC, 120G CXP AOC/ACC, Ethernet Converter and Fiber Optical Patchcord, Total fiber solution with CWDM, Mux/Demux, Repeater products.

Read More Related Article about DAC Cables:

10G SFP+ Cu Introduction

The 10G SFP+ Cu (shorthand for that 10G SFP+ copper direct attach cable) media type isn’t specified by the 802.3 standard, as well as the shorthand identifier was introduced by the vendors who developed this cable type. This low-cost short copper cable segment is beneficial, as an example, for interconnecting a collection of switches, as well as for short-distance connections between switch ports and Ethernet interfaces on servers as well as other devices. Before the growth and development of 10GBASE-T, this Direct Attach Cable (DAC) was the only real low-cost copper connection designed for 10 Gbps operation.

The DAC is terminated having a Small Form-Factor (SFF) connector module named the SFP+ (Small Form-factor Pluggable Plus). The SFP+ Transceiver module suits a port that’s roughly the size of an RJ45-style port, so that it is feasible for vendors to offer a higher port density on their own switches. A 10G SFP+ Cable shown as below:

10G dac
10Gbase SFP+ Direct Attach Cable

The SFP+ module isn’t standardized from any official standards body,but rather is specified by a Multi-Source Agreement (MSA) which was developed among competing manufacturers. MSAs will be the primary method used to develop communications connectors and transceiver modules which are utilized in Ethernet as well as other network systems. As technology advances, cabling and equipment vendors work with each other to develop smaller and much more efficient connectors and modules, with all the MSA being a rapid way of developing these enhancements. The SFP+ will be the second generation of the SFP+ standard. The classic SFP+ specifications support operation up to 4.5 Gbps. The SFP+ features support for 10 Gbps or better signaling, according to improved impedance matching specifications for much better signal transmission.

Vendors provide both active and passive versions of the 10GSFP+ Cu DAC. An DAC assembly is recognized as active in case there are signal processing electronics in the SFP+ module to increase signal quality and supply a lengthier cable distance. The lowest priced approach is the passive DAC, which has a tendency to be shorter; the active DAC can make it a possibility to support longer and thinner cable assemblies. The accessible cable lengths range from 1 m to 7 m, even though you will discover variations in supported cable lengths among different vendors.

The direct attach SFP+ Twinax cables use the same SFP+ connector module which is used on 10 Gbps optical fiber links. However, instead of utilizing an optical transceiver each and every end as well as a length of fiber optic cable, the DAC uses the SFP+ module, taking away the expensive optical lasers along with other electronic components. Both in active and passive cables, a smaller electrical component is used to recognize the SFP+ module and cable type to the Ethernet interface; that component is lower price and consumes not much power.

A DAC Cable is a limited assembly that’s bought at confirmed length, using the SFP+ modules permanently attached with each side of the cable. Although significantly thinner than 10GBASE-CX4 cable, it is stilla comparatively stiff cable. To set up the cable on anything apart from closely associated equipment, you’ve got to be ready to route the cable and it is attached SFP+ modules through any intervening cable management trays and cable guides.

Reference: Fiberstore

SFP+ Direct Attach Cable Wiki

Today, SFP+ Direct Attach Copper (DAC) cable becomes cloud computing and cloud storage mainstream primary connection tool, but what is DAC cable? For this, different manufacturers of DAC cable have different presentations and descriptions. And here, we’ve got a number of related information together, mainly to discuss what exactly is SFP + DAC cable also it other details, as well as discuss the advantages and disadvantages between Active and Passive SFP + cable.

Introduction of SFP+ Cable

The SFP+ interface provides the highest density, cheapest, and lowest power 10 Gigabit Ethernet solution commercially available today. Further SFP+ enables mass migration of the 1GbE network to 10 GbE by providing an extremely low priced 10G SFP+ Cu (direct attached copper cable assembly) option for short reach interconnects along with multimode and single mode fiber options. The SFP+ interface accepts along with hot-pluggable, small-footprint, optical transceivers, a Direct Attach Cable (10G SFP+ Cu), which replaces two optical modules and a connectorized optical fiber with a twinaxial copper cable assembly. The 10G SFP+ Cu option is defined for 10GbE applications over passive copper with a reach of 8.5m. The 10G SFP+ Cu link utilizes a receive equalizer from the host PHY/SerDes to be able to compensate for the Inter Symbol Interference (ISI) introduced by the cable. Electrical and mechanical specifications for SFP+ optical modules, 10G SFP+ Cu, and hosts are defined in the SFF-8431 specification developed by the SFF Committee, with broad industry participation.

What’s DAC Cable

10G SFP+ Cu(10G SFP+ Cable) is a copper interconnect using a passive twin-ax cable assembly that connects directly into an SFP+ housing. It has a range of 10 meters and like 10GBASE-CX4, is low power, low-cost and low latency with the added advantage of having the small form factor of SFP+, and smaller, more flexible cabling.SFP+ Direct Attach is known as the successor technology to 10GBASE-CX4. SFP+ Direct Attach, as implied in the name, uses SFP+ MSA and by using the inexpensive copper twinaxial cable with SFP+ connectors on both sides, provides 10 Gigabit Ethernet connectivity between devices with SFP+ interfaces. SFP+ Direct Attach has a 10 meter distance limitation, thus the target application is interconnection of top-of-rack switches with application servers and storage devices in a rack.

DAC-Cable

Pasive and Active SFP+ DAC Cables

Passive cables are much less costly but require the host to do the work of driving it properly.

Benefits:

  • Lower Costs
  • Higher Reliability

Tradeoffs:

  • No LOS
  • No TX Disable
  • No Interrupts
  • Limited Management Interface
  • Host must drive Cu cable

Active cables provide the added benefit of being “optical-module” like.

Benefits:

  • Enhanced Signal Integrity
  • Longer Cable Lengths
  • Transmit Pre-emphasis
  • Active/Adaptive Receive Equalization
  • Tx Disable
  • Loss of Signal (LOS)
  • Interrupts
  • Management Interface
  • Looks like an optical module
  • Don’t have to worry about host Tx/Rx for Cu cables

Tradeoffs:

  • More Expensive

You can also get the DAC cable and other Fiber Optic Transceivers easily from Fiberstore.