Questions tagged [sfp]

The Small Form-factor Pluggable is a transceiver module for gigabit-range connections, mostly optical (up to 2.5 Gbit/s). It is also called mini-GBIC sometimes. SFP+ modules may support up to 16 Gbit/s.

Filter by
Sorted by
Tagged with
0 votes
2 answers
68 views

Is there a limit to the number of 10G copper SFP modules one can use in a switch?

I'm shopping for a new 10G ethernet switch for home, for copper ports. The majority have SFP ports and lack RJ45 ports for copper. I understand this provides flexibility but I only need UTP/Copper to ...
Criggie's user avatar
  • 717
1 vote
1 answer
72 views

SFP Bidi with Different Downstream to Upstream Wavelength is working?

After reading some documents available about concepts of BiDi SFPs. There should be a pair sfp upstream dan downstream to make a link established. when sfp U on wavelength 1310nm-Tx/1490nm-Rx should ...
Maktum's user avatar
  • 11
2 votes
1 answer
157 views

'SGMII' in copper SFP modules

Currently I see three types of 1Gbps copper SFP modules at the same store: "SFP 1000BASE-T" "SFP 10/100/1000BASE-T | SGMII" "SFP 10/100/1000BASE-T | SGMII | Rx LOS" If ...
u1686_grawity's user avatar
0 votes
2 answers
64 views

Hardware compatibility of SFP+ devices [closed]

I have a Supermicro E300-8D (used as firewall) I want to plug to a Mellanox SX1012 device. I have tried different cables : mellanox mc2309130-001 supermicro cbl-0348L different switches : Mellanox ...
Dede's user avatar
  • 101
0 votes
2 answers
147 views

Can wrong SFP module damage equipment?

SFP modules convert electrical data from the equipment to optical signals. There is no incoming power surging from an optical port to damage the equipment according to my undarstanding of fibre optics....
SandShriner's user avatar
0 votes
3 answers
128 views

same rack connection: better RJ45 or SFP?

For a connection between two devices on the same rack: Is there any notable difference or advantage between using 1Gb SFPs and using Gb Ethernet ports? (making a bonding/etherchannel). I know for ...
lyskiddie's user avatar
2 votes
1 answer
211 views

Support for 10GBase-T RJ45 SFP+ transceivers

Support for 10GBase-T RJ45 SFP+ transceivers in modern switches can be a hit and miss. What is the technical limitation as to why some switches don't support them? So far my understanding on the issue ...
GreenLantern22's user avatar
0 votes
2 answers
412 views

SFP+ / SFP28 / SFP backwards compatibility

I have the opportunity to upgrade from VDSL to any of 1/10/25 GbE fiber. I have only an SFP router presently (Edgerouter 4), but would like to have the service provider upgrade to optimally the 25 ...
Scott's user avatar
  • 103
0 votes
1 answer
286 views

SFP28 port and SFP module (not SFP+)

I'm about to buy a device that has some SFP28 ports. I know that SFP28 is backward compatible with SFP+. But I want to know its backward compatibility with the SFP module. Can I use an SFP module (...
A.A's user avatar
  • 551
2 votes
1 answer
254 views

What is Ethernet MDI in the case of SFP interfaces

I am reading on Ethernet and I understand that for copper ports, the MDI is the physical connections from the PHY to the medium's connector, including the physical port itself, where the cable is ...
Marcus's user avatar
  • 183
1 vote
1 answer
157 views

Must SFP28 controllers explicitly support different SFP28 transceiver features (i.e. SR vs eSR vs cSR)?

To solve a specific server clustering problem I am opting to split the patching of the servers to both "in the same room" and "in another room". We have multimode cabling between ...
alex's user avatar
  • 157
0 votes
1 answer
1k views

Duplex SFP via one single mode fiber [duplicate]

Is that possible to use duplex SFP which will send and receive signals over only one fiber in backbone? Please refer to the picture. If so, then how the termination of patchcords and backbone's fiber ...
A M's user avatar
  • 3
7 votes
1 answer
455 views

Will a 3rd party SFP module void Cisco warranty?

Will using a non-Cisco branded SFP module void any warranty with Cisco (either with the switch or network module)? The SFP we are looking for more cost effective alternatives is SFP-10G-SR-S in a ...
Ryan F's user avatar
  • 93
0 votes
0 answers
23 views

SFP, standard EEPROM? [duplicate]

I have a SFP compatible module which has an I2C interface. I understand that SFP is a pseudo-standard but I can't find any documentation on the I2C interface and what registers in the EEPROM do what. ...
CakeMaster's user avatar
16 votes
3 answers
4k views

How come SFP modules are so incompatible?

In theory I like the SFP concept very much. However what strikes me is the manufacturer restrictions for every switch/card. How come different SFP modules work with different vendors only? Is there a ...
Thomas's user avatar
  • 269
0 votes
2 answers
115 views

Connect 1GE SFP MM to 10GE SFP MM

I have a situation in which the ISP can only accommodate a 1GE SFP and single mode fibre, but we have bought 10GE SFP. Is it possible to get the physical link up when connecting a 1GE SFP to a 10GE ...
Caine Kiewit's user avatar
-3 votes
1 answer
91 views

Small Form-factor Pluggable(SFP): basic , connection with 2.SFP

**My understanding of SFP functionality. ** SFP is an “interface” between 2 parts of a device. SFP is a transceiver There are input and output, electrical to optical or optical to electrical. SFP ...
Noel Miller's user avatar
-1 votes
1 answer
674 views

SFP not working on new switch

Switch: Cisco 2960G 24x 1G ports and 4x 10G SFP SFP fiber module: 10Gtek AXS13-192-10 NIC: Solarflare SFN7122F I got a new to me switch, after resetting to factory defaults I got it all configured for ...
rasmukri's user avatar
  • 101
5 votes
1 answer
2k views

Do you need SFP on both ends?

Can I have an SFP port with a RJ45/ethernet transceiver on one end and connect the other end to a regular ethernet port?
tgurske's user avatar
  • 53
2 votes
1 answer
216 views

Fabric Extender for Peer-Link on vPC domain (two Nexus 5000 switches)

I have two Nexus 5000 series switches. My question lies with the Peer Link. My intentions are to use e1/31 and e1/32 on both switches as the peer link. Here are the exact SFPs that I am using for ...
AfroJoe's user avatar
  • 123
0 votes
1 answer
290 views

Exceeding SFP manufacturer maximum distance

What are the consequences of exceeding the SFP manufacturer maximum distance ? Example from Cisco, Table 2. SFP+ port cabling specifications of https://www.cisco.com/c/en/us/products/collateral/...
bdes31's user avatar
  • 1,085
1 vote
1 answer
531 views

QSFP28 doesn't recognize 4x25G breakout cable and link with 4 SFP28s

So to preface, I'm not a network engineer but am somehow in charge of getting our juniper QFX5200-48y configured. The goal is to get our FS brand SPF28's and QSFP28's to talk to each other on the ...
girafferan's user avatar
1 vote
3 answers
617 views

QSFP-DD Transceivers for lower rates

I am trying to figure out if a QSFP-DD transceiver can break out 8x 10G lanes if I make/use a 1:8 fiber optic breakout cable. It seems like most transceivers are rated for one speed only, so if I get ...
bchang32's user avatar
2 votes
2 answers
782 views

SFP+ 10GBASE-LR and attenuator

This picture is a part of the Intel E10GSFPLR (SFP+, Long Reach) datasheet. Can I use them in a short link (less than 1 meter) without any attenuator? Which numbers are important in this datasheet to ...
A.A's user avatar
  • 551
2 votes
1 answer
231 views

If SFP supports 4.25Gbps why don't they make a SFP RJ45 2.5Gbps module?

SFP transceivers support speeds up to 4.25Gbps, but SFP RJ45 only support 100/1000Mbps Why is there no support for 2.5Gbps RJ45? Is this a technical limitation or did no one ever decide to make SFP 2....
Arian Faurtosh's user avatar
0 votes
0 answers
345 views

Open Switch (OPX): Accessing SFP EEPROMs via I2C on a Dell S4112F-ON

The S4112F-ON switch has 12 SFP+ ports; we are using several of them. My goal is to access the EEPROM on ALL the SFPs on the switch via their i2c interface with i2c-tools (linux) and ultimately open ...
jmcarter9t's user avatar
0 votes
1 answer
700 views

Auto negotiation and SFP+

As far as I know, SFP+ ports are connected to the host by SFI (SerDes Framer Interface) in a white box (I think it was Edgecore). Is it possible to have the auto-negotiation feature in these kinds of ...
A.A's user avatar
  • 551
1 vote
1 answer
194 views

Single mode, single strand fiber handles 1Gbit but not 10Gbit

I have a strand of dark fiber between two buildings, with the run being roughly 1.5 miles/2.4km, and it is currently operating with 1Gb BX 10km optics, but when I try to put in 10Gb BX 10km optics, I ...
Josh Eblin's user avatar
2 votes
2 answers
690 views

Fiber link loss on Cisco Catalyst 3750x series switch

I have cisco catalyst 3750x 24 port switch series switch, and the switch has C3KX-NM-10G module. Problem : I have connected fibre optic in SFP+ transceiver on G2/TE1 (Uplink).  After 7 to 8 hours, the ...
sjarasan's user avatar
  • 125
1 vote
1 answer
146 views

Using XFP-10G (120 KM Range) on Juniper MX routers

Hi everyone, We recently installed a new 10G XFP optics module in Juniper MX router. As per the customer , XFP supported range is 120 KM and it is from some third party vendor named 'menara'. Menara ...
Nabeel's user avatar
  • 1,120
3 votes
2 answers
359 views

SFP to SFP going through multiple environments – segmented or via single cable?

Design consideration – should I use a single fiber between two server rooms or split it into segments for easier maintenance/diagnostics/replacement? But splitting the fiber into multiple segments ...
miroxlav's user avatar
  • 141
2 votes
1 answer
1k views

Can a QSFP28 port break out to 4 SFP+ ports to separate hosts?

I apologize in advance because I suspect this is already covered. I've read some of the posts and I suspect the answer is "it depends on the vendors involved" or just "no". I'm ...
William Jens's user avatar
1 vote
3 answers
6k views

Using Ethernet cable in SFP+ Port

Can you use an Ethernet cable (Cat6) in a switch's SFP+ port to connect to another switch?
user10776032's user avatar
0 votes
2 answers
2k views

Connect switch to router

I have a switch with 4x 10Gb SFP+ ports. Can I use one of the SFP+ ports to connect to a router with a fiber cable?
user10776032's user avatar
0 votes
2 answers
701 views

Connecting switches together

I have L2 switches which will be daisy chained together (yes I know, daisy chaining isn't great, but anyway..) The L2 switches will then link to a L3 switch. Both the L2 and L3 switches have x4 10GbE ...
The_Bear's user avatar
  • 515
2 votes
1 answer
1k views

10G SFP+ transceiver with OM4 fiber cable - Maximum cable length?

I can't find 10Gb SFP+ transceivers supporting cable length over 300mt (we need 400/500mt) is there a standard/physical limit on this, or such transceivers, with extended length support, do exist? We'...
Riccardo's user avatar
  • 163
1 vote
1 answer
995 views

Activating the NEBS Compliance SFP on Juniper MX disabled due to Ambient Temperature Exceeded

We have faced an issue on Juniper MX960 that some SFPs (10G Optics) were disabled due to ambient temperature exceeded. This was observed in the syslog messages on MX. However after the physical ...
Nabeel's user avatar
  • 1,120
7 votes
3 answers
1k views

Fiber between two sites - no signal lights

We need to have fiber connection between two sites (distance less than 300 meters from each other). Currently there is multi-mode fiber connected to old switches working nicely. Now we are updating ...
lingo's user avatar
  • 71
1 vote
2 answers
870 views

Are optical Gigabit SFP modules backwards compatible with 100Base-Fx?

My FTTH connection is using an old CareLink CL-MC-W2B-20-100 optical converter. It is labelled: 10/100 Base-T to 100Base-Fx bi-direction/single fiber media converter 10/100M Single mode WDM 20Km ...
Vasfed's user avatar
  • 111
3 votes
1 answer
2k views

Latency of 10G fiber SFP+

I'm optimizing network stack for latency. We were using SFP+ with fiber than we came to know that Direct Attach Cables (DAC) have lower latency as there is no SFP involve Link. We are measuring wire ...
ahmed's user avatar
  • 33
0 votes
1 answer
92 views

Fiber SFP from Mikrotik RB4011iGS+RM (SFP+) to ZyXEL GS1900-10HP (SFP)? [closed]

Suggestions how to run an SFP from my MikroTik RB4011iGS+RM (SFP+) to a ZyXEL GS1900-10HP (SFP)? Apparently I'll need a different SFP module on each end, due to the different interfaces, while making ...
Vladimir Dzhuvinov's user avatar
3 votes
4 answers
2k views

SFP-10G-LRM compatible with Single Mode Fiber?

I just started working with new company and found they are using SFP-10G-LRM with single mode fiber. How could this be? I thought since the SFP-10G-LRM is Multimode, it can't work with single mode ...
A Culver's user avatar
1 vote
1 answer
615 views

SFP to RJ45 for 10Gbit network

I am in the process of upgrading some of our network into 10Gb and grabbed the following: A network switch by netgear, mode:GS110EMX A bunch of assorted cat8 cables(for future proofing) Two 10gtek ...
Jono's user avatar
  • 111
1 vote
2 answers
4k views

Does a SFP port indicator goes on when receiving or transmitting or both

My questions are on the bottom, feel free to skip my debugging story if you're in a hurry. Story I started to check a network spanning tree status. All switches are connected on fiber, through SFP ...
MZanetti's user avatar
0 votes
2 answers
1k views

SFP/SFP+: Extender? F/F panel passthrough?

My primary question is this: Is it possible to have a simple passive SFP/SFP+ bulkhead passthrough connector, with two female SFP/SFP+ sockets facing opposite directions and wired directly together, ...
Dale Mahalko's user avatar
0 votes
1 answer
43 views

SFP LC to LC path code recommendation [closed]

I need to connect to Ubiquiti (router > Switch) using SFP. I believe I need a Ubiquiti Networks UF-SM-1G-S transmitter (BiDi). the cable will be around 40M long and crossing the house, underneath ...
Kevin's user avatar
  • 115
1 vote
1 answer
128 views

new SFP network for newbies

I never really sealed with SFP before but I want to created a new fibre network. Can SFP just be plug & play like ethernet or do you need a lot of knowledge ? I assume it's carry the normal IP/...
Kevin's user avatar
  • 115
2 votes
2 answers
1k views

Will OM4 Fiber Work with my 1GbE Fiber Transceiver?

What is the fastest cabling that can be used to connect the transceiver that Meraki calls the 1GbE SFP SX Fiber Transceiver? Source: meraki.cisco.com/products/switches/accessories I'm trying to ...
Lonnie Best's user avatar
0 votes
2 answers
697 views

SFP modules and LC-to-LC patch panels?

Simply put, we are joining two sites that are 200m apart using 8 core OM4 Multimode fibre cable. Am I correct in understanding that lc patch panels on either end of the fibre cable are ok and that ...
Squid_Vicious's user avatar
4 votes
1 answer
427 views

How to connect QSFP+ transceiver with MPO connector and SFP+ transceiver with LC connector?

In data center application, 40G QSFP+ transceivers with MPO connector and 10G SFP+ transceivers with LC connectors are most common transceivers. But, with two different connectors, how can we make a ...
user avatar