Tag Archives: Cisco SFP

How to Select 10G SFP+ Modules for Cisco Switches?

10G fiber optic network is being widespread in today’s telecommunication network. A lot of 10G fiber optic devices like switches are being uses, among which Cisco devices are the most commonly used according to statistics. If you choose a Cisco switch, Cisco original brand or Cisco compatible modules like SFP/SFP+ might be needed for transferring between optical signals and electrical signals. This post will offer details about how to select the proper 10G SFP+ module for Cisco switches.cisco compatible modules

Understand 10G IEEE Standards and How Cisco Name Its Modules

10G fiber optic network is mature now, and there is a wide selection of 10G IEEE standards for different 10G networking applications and environments. Before you buy 10G SFP+ modules for your Cisco switches, you should firstly get to know these 10G standards.

10G IEEE Standards

IEEE has defined 10G standards for different transmission distance and transmission media. For instance, there are 10GBASE-SR for short distance up to 300 meters over OM3 multimode optical fiber and 10GBASE-LR for long distance up to 10 kilometers over single-mode fiber. There are also standards for 10G transmission over copper cables like 10GBASE-CR and 10GBASE-T. The following table listed the details for the most commonly used 10G standards.

10G IEEE Standards Description
10GBASE-SR Support 10G transmission over wavelength of 850nm via multimode fiber
in short distances: OM3 (up to 300m) and OM4 (up to 400m).
10GBASE-LR Support 10G transmission over single-mode fiber up to 10km
over wavelength of 1310nm.
10GBASE-LRM Support 10G transmission over standard multimode fiber up to 200m
over wavelength of 1310nm.
10GBASE-ER Operate over 1550nm wavelength and support transmission distance up
to 40km over single-mode fiber. Attenuation is required for transmission
distance shorter than 20km.
10GBASE-ZR Support 10G transmission over 1550nm single-mode fiber optic up to 80km.
For short links, attenuation is required to ensure transmission quality.
10GBASE-BX Support duplex 10G transmission over a single single-mode fiber using
two different wavelengths up to 80km.
10G CWDM/DWDM Support 10G transmission over 1550nm single-mode fiber optic up to 80km.
For short links, attenuation is required to ensure transmission quality.
10GBASE-CR Support 10G transmission over Twinax copper cable in very short distance
and offer a cost-effective way for connections within racks.

Product Name of Cisco 10G SFP+ Modules

The naming system of Cisco 10G SFP+ modules is closely related to the IEEE standards. Here I listed several examples for Cisco 10G SFP+ modules to better illustrate how Cisco names its 10G SFP+ modules.

10G IEEE Standards Cisco 10G Modules Product Number Example
10GBASE-SR Cisco SFP-10G-SR
10GBASE-LR Cisco SFP-10G-LR
10GBASE-LRM Cisco SFP-10G-LRM
10GBASE-ER Cisco SFP-10G-ER
10GBASE-ZR Cisco SFP-10G-ZR
10GBASE-BX Cisco SFP-10G-BXD-I & SFP-10G-BXU-I; Cisco SFP-10G-BX40D-I & SFP-10G-BX40U-I
10G CWDM/DWDM Cisco CWDM-SFP10G-1470; Cisco DWDM-SFP10G-61.41
10GBASE-CR Cisco SFP-H10GB-CU1M; Cisco SFP-H10GB-ACU7M

For common 10G SFP+ modules, Cisco uses the key words of the standards to name the responding modules. For special modules, Cisco has built another naming system.

Cisco BiDi SFP+

For a pair of BiDi SFP+ modules, letter “D” and “U” is used to the two modules that are used together on each end of the fiber optic link. For instance, SFP-10G-BXD-I & SFP-10G-BXU-I is a pair of BiDi Modules that can support transmission distance up to 10km. Additional numbers are added to mark the transmission distance of the BiDi modules. SFP-10G-BX40D-I & SFP-10G-BX40U-I is a pair of BiDi SFP+ modules that can support transmission distance up to 40km.

For CWDM 10G SFP+ and DWDM SFP+, the wavelength is added in the part number. For instance, CWDM-SFP10G-1470 is the part number of a CWDM SFP+ that is operated at wavelength of 1470nm. If you want a CWDM SFP+ operating over 1550nm, then the product number of this CWDM module should be CWDM-SFP10G-1550. As all the DWDM SFP+ modules are operated over wavelengths around 1500nm, in the product number of Cisco DWDM SFP+ modules, the first two number 1 and 5 is eliminated. For example, DWDM-SFP10G-61.41 stands for a DWDM SFP+ transceiver with operating wavelength of 1561.41nm.

10G SFP+ DAC

For modules like SFP+ direct attach cable (SFP+ DAC) and SFP+ active optical cable (SFP+ AOC) which contains a length of cables, Cisco combines the characters of IEEE standard and number to name its modules. Cisco SFP-H10GB-CU1M stands for 10G SFP+ direct attach copper cable that is one-meter long. Cisco SFP-10G-AOC2M is a 2-meter long 10G SFP+ active optical cable.

Do You Really Need Cisco Original Brand SFP+ Modules?

Except IEEE standard and transmission distance, to select the proper 10G SFP+ modules should also considerate several other factors like compatibility and costs.

Although Cisco has a wide selection of switches and 10G SFP+ modules, but not every SFP+ modules can work well on every Cisco switches SFP+ port. Before selecting the SFP+ msodule for your Cisco switch, you must make sure this SFP+ is compatible with your switch.

The second important factor is the costs for the SFP+ modules. Why? SFP+ module is just a small part of the whole fiber optic network, but the use amount of SFP+ module is very large. Cisco Original brand SFP+ modules are usually expensive. Thus, select cost-effective modules are necessary. Actually, Cisco Original brand SFP+ module is not the only choice. There are also many third party modules that it compatible with Cisco switches. Generally, prices of third party fiber optic transceivers are much lower than the original brand ones.

10G-SFP-LR

How to Buy Cisco 10G SFP+ Modules?

If you have plenty of money, you can directly order the modules from Cisco. However, if you are going to select the third party modules for a cost-effective solution, then the quality and compatibility would be very important. FS.COM is a provider offers a full range of Cisco compatible modules. All its modules are fully tested in original brand switches to ensure the compatibility and quality. What’s more, FS.COM uses the same naming system as Cisco for its Cisco compatible modules and generic fiber optic modules. A list is also offered in the product page of each fiber optic modules showing the compatible switches and platforms. Customer can use the Cisco product number to search Cisco Compatible and generic modules in FS.COM directly.

Cable and Optics Solution for Catalyst 4948E and Catalyst 4948E-F Switches

Catalyst-4849E-F switch

Cisco Catalyst 4900 series switches were once the most widely deployed ToR (top-of-rack) switches in this industry. This post will introduce the detailed cabling information for two upgrade version of this series switches, which are Cisco Catalyst 4948E and Catalyst 4948E-F. Compared with Catalyst 4900 series switches, the two switches double the uplink bandwidth and provide nonblocking server-to-server traffic with 176G aggregate throughput. Meanwhile, they provide true front to back and back to front airflow with no side or top venting, which can largely reduce the cooling burden of the data centers.

Port Information of Catalyst 4948E and Catalyst 4948E-F

Cisco Catalyst 4948E and Catalyst 4948E-F are very alike. The main difference of the two switches is that the air flow in the Catalyst 4948E goes from the front to the rear of the switch while in Catalyst 4948E-F switch the air flow goes from the rear to the front. The front panel of the two switches is generally the same. Both of the two switches are one-rack-unit (1RU) fixed configuration switch with 48 RJ45 ports of 10/100/1000M for downlink and 4 SFP/SFP+ ports of 1/10G for uplink on the front panel. The following picture shows the detailed port information of Cisco Catalyst 4948E and 4948E-F switch.Catalyst 4948E-F ports information

Downlink Connection for Cisco Catalyst 4948E and Catalyst 4948E-F

The 48 ports on the front panel of Catalyst 4948/4948E-F can support downlink of 10/100/1000M. The great advantage of these ports is that they can configure themselves to operate at the speed of the attached devices. If the attached devices do not support auto-negotiation, the speed and duplex parameters can be set explicitly. A network cable with a RJ-45 plug at both end can connect Cisco Catalyst 4948E/4948E-F switch to the downlink target devices.

Uplink Connection for Cisco Catalyst 4948E and Catalyst 4948E-F

The four uplink SFP/SFP+ ports on Cisco Catalyst 4948E and Catalyst 4948E-F can support both copper and fiber optic transmission of 1G/10G by using different modules and cables. In addition, these ports can also support CWDM SFP transceivers and DWDM SFP transceivers. The following part will introduce the details about how to connect Cisco Catalyst 4948E/4948E-F to 1G network and 10G network.

For 1G connection based on cooper, the 1000BASE-T can be used with RJ45 connector and Cat5 cable. For 1G connection based on fiber optic, there are a wide range of SFP transceivers can be used. Different SFP transceivers should be used with appropriate cables to ensure its best performance. For example, CWDM and DWDM SFP transceivers is usually used with LC connector and single-mode fiber optic cable, thus they can support long distance transmission. The following table presents the solutions for Cisco Catalyst 4948E/4948E-F 1G uplink connection.

Modules Connector & Cable Distance
GLC-T (1000BASE-T) RJ45,Cat5 100m
GLC-SX-MM LC duplex, MMF 550m
GLC-SX-MMD 550m
GLC-LH-SM LC duplex, SMF 10km
GLC-LH-SMD 10km
GLC-EX-SMD 40km
GLC-ZX-SM 70km
GLC-ZX-SMD 70km
CWDM SFP 40-120km
DWDM SFP 40-120km
GLC-BX-D LC simplex, SMF 10km
GLC-BX-U 10km
GLC-BX40-D-I 40km
GLC-BX40-U-I 40km
GLC-BX40-DA-I 40km
GLC-BX80-U-I 80km
GLC-BX80-D-I 80km

For 10G connection, both transceiver and DAC (direct attach cable) can be used, according to the transmission distance requirements. Generally, 10G SFP+ to SFP+ DAC can support transmission distance around 10 meters. If transmission distances are up to hundreds meters or kilometers, fiber optic transceivers should be used. The following table is the detailed solution for Cisco Catalyst 4948E/4948E-F 10G uplink connection.

Modules Connector & Cable Distance
SFP-10G-LRM LC duplex, MMF 220m
SFP-10G-SR 300m
SFP-10G-SR-S 300m
SFP-10G-LR LC duplex, SMF 10km
SFP-10G-LR-S 10km
SFP-10G-ER 40km
SFP-10G-ER-S 40km
SFP-10G-ZR 80km
SFP-10G-ZR-S 80km
DWDM SFP+ 40-80km
SFP-10G-BXD-I LC simplex, SMF 10km
SFP-10G-BXU-I 10km
SFP-10G-BX40D-I 40km
SFP-10G-BX40U-I 40km
SFP-H10GB-CU1M 10G SFP+ DAC Twinax Cable 1m
SFP-H10GB-CU3M 3m
SFP-H10GB-CU5M 5m

Please contact sales@fs.com or visit FS.COM for more details about the compatible transceivers and DACs for Cisco Catalyst 4948E and Cisco Catalyst 4948E-F switches.

Source: http://www.fs.com/blog/catalyst-4948e-catalyst-4948e-f-cabling-solutions.html

SFP Transceiver Module Troubleshooting

SFP (small form-factor pluggable) is a compact, hot-pluggable transceiver module used for both telecommunication and data communications applications. With the increasing high speed data transmission demands of people, products, such as SFP+, CFP and QSFP/QSFP+ etc. have shared the market. Nonetheless, SFPs have still played an important role in telecommunication and data communication.

Transceiver-Solution

As a widely and commonly used component in data transmission, due to the incorrect operation or other factors, it is hard to avoid facing the faults in using SFP, and sometimes even result in a bad situation and heavy loss. This paper will help you to diagnose the SFP problems (take Cisco for example) and give some resolution tips. I hope it would be acted as a learning tool and a reference source for both new and experienced technicians who work in this field.

To diagnose SFP problems, you can get statistics from the browser interface, the CLI (Command Line Interface) or an SNMP (Simple Network Management Protocol) workstation. The most common SFP problems include these aspects:

  • Poor performance
  • No connectivity
  • Corrupted software

Poor Performance (or Excessive Errors)
Possible Cause:
The possible causes of this problem include that cabling distance is exceeded or port statistics show excessive frame check sequence (FCS), late-collision, or alignment errors.
Resolution:

  • Reduce the cable length to within the recommended distances.
  • See your SFP module documentation for cabling guidelines.

No connectivity
Possible Cause:
This problem is most likely related to cabling. Using incorrect or bad cable, or incorrect cable wiring, or STP (Shielded Twisted Pair) checking for possible loops may probably lead to this problem.
Resolution:

  • Verify the pinouts are correct for the proper application of cables.
  • Replace the cable with a tested good cable.
  • Wait 30 seconds for the port LED to turn green.

Corrupted software
The corrupted software here we mentioned include the following three situations.
1.The port is placed in error-disabled state after SFP is inserted.
Possible Cause:
This problem is usually caused by bad or non-Cisco-approved SFP module(ie. the incompatible SFP).
Resolution:
Remove the SFP module from the switch and replace it with a Cisco-approved module. Use the irrdisable recovery cause GBIC-invalid global configuration command to verify the port status, and enter a time interval to recover from the error-disable state. The best advice is to use the Cisco original SFP or 100% Cisco compatible SFP (If you decide to use a third-party SFP, please ensure that your supplier is assured) that is adapted to the switch.

2.Device does not recognize the SFP module.
Possible Cause:
This problem is generally related to the SFP installation. Situations, such as SFP is installed upside dowm or does not snap into the slot can cause this problem.
Resolution:

  • Verify that the SFP module is not installed upside down.
  • Remove the SFP module. Inspect for physical damage to the connector, the module, and the module slot.
  • Replace the SFP module with a known good SFP module.

3.Excessive errors found in port statistics.
Possible Cause:
Bad adapter in attached device or STP checking for possible loops can cause this problem.
Resolution:
Run adapter card diagnostic utility and wait 30 seconds for the port LED to turn green.

Some common error message of Cisco Switch When Using With SFP Module
Error Message: Transceiver module inserted in port
Explanation: The online insertion and removal (OIR) facility detected a newly inserted transceiver module for the interface specified in the error message.

Error Message: INIT_FAILURE: Detected for transceiver module in port, module disabled
Explanation: An initialization failure occurred for the transceiver module for the interface specified in the error message. This condition could be caused by software, firmware, or hardware problem. As a result of the error, the module is disabled.

Recommended Action: Try reseating the module. Hardware replacement should not occur first occurrence. Before requesting hardware replacement, review troubleshooting logs with a technical support representative.


Error Message: NOT_IDENTIFIED: Detected for transceiver module in %s, module disabled
Explanation: The transceiver module for the interface specified in the error message could not be identified and may not be compatible with the interface. The transceiver module specified in the error message contains a transceiver code which could not be correctly interpreted. As a result of the error, the module is disabled.

Recommended Action: Replace the module with a compatible transceiver.


Error Message: UNSUPPORTED-TRANCEIVER: Unsupported SFP transceiver found on board. Warranty/support may void
Explanation: The transceiver module for the interface specified in the error message is not a Cisco supported module. As a result of the error, the module is disabled. When Cisco determines that a fault or defect can be traced to the use of third-party transceivers installed by a customer or reseller, then, at Cisco’s discretion, Cisco may withhold support under warranty or a Cisco support program. In the course of providing support for a Cisco networking product Cisco might require that the end user install Cisco transceivers if Cisco determines that removing third-party parts will assist Cisco in diagnosing the cause of a support issue.
Recommended Action: None.

Related Article: How to Install SFP transceiver?

CWDM/DWDM SFP transceiver easy-to-deploy Gigabit Ethernet

The Coarse Wavelength Division Multiplexing (CWDM) SFPs are hot-swappable, transceiver components that you plug into SFP-compatible uplink ports. DWDM Small Form-Factor Pluggable (SFP) transceivers provide the high speeds and physical compactness that today’s networks require while delivering the deployment flexibility and inventory control that network administrators demand. The Cisco DWDM SFP transceiver allow enterprise companies and service providers to provide scalable and easy-to-deploy Gigabit Ethernet or Fiber Channel services in their networks. Our DWDM SFPs are available in all 100 GHz C-band wavelengths on the DWDM ITU grid. They are designed to Multi-Source Agreement (MSA) standards to ensure broad network equipment compatibility. Our DWDM SFP transceiver has the following features: Up-to 80km over SMF 1Gbps, 100GHz (C-Band) DWDM SFP Transceiver, 0º – 70º Operating Case Temperature, SFF-8724 Digital optical monitoring, Hot-swappable for SFP LC ports, Cisco 90 day standard warranty, Cisco SFP can be covered by SMARTnet, SFP MSA / IEEE Std 802.3, Cisco compact DWDM MUX DEMUX is RoHS compliant. (Fiberstore Transceivers products 10% discount, welcome to choose and buy!)
Cisco DWDM-SFP-3819
CWDM (Coarse Wavelength Division Multiplexing) is a technology that allows for multiple channels, of mixed protocols and data rates, to be COMBINED and transmitted over fiber optic cable.

Where previously additional fiber needed to be run, now existing strands can be more fully utilized, reducing fiber plant expenditures as bandwidth needs increase. Fiberstore’s CWDM transceivers provide scalable intra- and inter-campus connections over fiber links. Eight wavelengths are available in multiple distances enabling substantial bandwidth without running new fiber.
Coupled with Fiberstore’s passive CWDM multiplexer or WDM transport systems, the these products reduce the cost of high bandwidth network updgrades.

About Fiberstore

Fiberstore designs, manufactures, and sells a broad portfolio of optical communication products, including passive optical network, or PON, subsystems, optical transceivers used in the enterprise, access, and metropolitan segments of the market, as well as other optical components, modules, and subsystems. In particular, Fiberstore products include optical subsystems used in fiber-to-the-premise, or FTTP, deployments which many telecommunication service providers are using to deliver video, voice, and data services.

The global, vertically-integrated business model and expertise in optical design enables Fiberstore to rapidly deliver market-leading, high performance fiber optic components and subsystems. The R&D and engineering teams provide strong innovative capability , who have core technical knowledge ranging from optoelectronic device, optical subassembly, and module design, to product and manufacturing process development expertise. With over 200 employees primarily in Dong Guan and ShenZhen, we can serve the customers and distribution partners around the world fast. What’s more, our custom service and wholesale service save customers’ time and money, making customers enjoy personalization.

Related Products:

Buy Cisco GLC-SX-MM SFP For Fiber Optic Networks

Using the rise of communication standards. Global companies now come face-to-face utilizing the fact that they have to upgrade their fiber optic network systems. This way, they get to support data transformation in all forms. This is where periphery components like the Cisco GLC-SX-MM Transceivers prove useful.

The GLC-SX-MM is a hot-swappable tool that connects a Gigabit Ethernet interface, as well as the video machine to the main harbour using the multilevel. It is also commonly used between switches, Wireless LAN Controllers, and firewalls. It is a Short Form-Factor Pluggable that works well having a wide selection of services and products, and can be mixed and matched on the port-by-port basis. This makes it quite competent in either simple or extremely complex networking environments. On top of that, the GLC-SX-MM has high end modules that sustain a data-rate of just one.25 Gbps. For multi-mode fibers, which are probably the most commonly installed types in communal settings, it can transmit data as much as 500mm.

SFP transceivers usually come in different models. This allows the consumer to modify and configure the machine in a manner that it gets proper optical reach, either with multi-mode or single-mode optic fiber cables. The four categories of SFP modules would be the SX, that is 850nm, the ZX, which is 1550nm, the LX that is 1310nm and the DWDM. They are typically created using copper cable interfaces, which permit a host device for connecting via unshielded twisted-pair network cable. The CWDM can also be utilized through single optic cables, and they’re 1310/1490 upstream and downstream.

There are several known producers of SFPs and it’s important that you will get to understand these brands, especially Cisco, if you are planning to grow your network. That way, you’re able to acquire the right kind of gear that would complement the body. If you are looking to buy these things, you may to stick to only one manufacturer, so that compatibility issues don’t arise. Despite the generalization of the IEEE standards that made parts more flexible and inter-changeable for diverse networking needs, there’s still minimal be certain that Avaya networking products would work with Netgear and Cisco gadgets. Now, since Cisco is among the pioneering companies and established brands when it comes to network systems with 28 many years of service, customers can be assured that they will automatically work in any network setup and that in-house engineers will know how to configure them to stabilize the linkages.

When buying Cisco SFP transceivers and supporting network tools, it’s possible to expect costly investments because these are not equipped cheap. However, with thorough research, it is possible for an organization to obtain fair prices for their purchases. It is essential, though, they get expert consultancy first, before any transaction is made. This approach, the specified outcomes are insured, and delays, as well as excess expenses won’t be realized. The Internet provides expansive info on network systems, as well as reliable retailers of networking accessories. Thus, you won’t need to break a sweat in searching for those exact pieces you need.