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
113 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 ...
  • 103
0 votes
1 answer
35 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 (...
  • 551
2 votes
1 answer
86 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 ...
  • 139
1 vote
1 answer
62 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 ...
  • 135
0 votes
1 answer
478 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 ...
  • 3
7 votes
1 answer
196 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 ...
  • 93
0 votes
0 answers
19 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. ...
15 votes
3 answers
3k 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 ...
  • 259
0 votes
2 answers
69 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 ...
-3 votes
1 answer
54 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 ...
-1 votes
1 answer
241 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 ...
4 votes
1 answer
1k 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?
  • 43
2 votes
1 answer
164 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 ...
  • 123
0 votes
1 answer
156 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/...
  • 1,075
1 vote
1 answer
278 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 ...
1 vote
3 answers
353 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 ...
2 votes
2 answers
505 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 ...
  • 551
2 votes
1 answer
155 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....
0 votes
0 answers
227 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 ...
0 votes
1 answer
354 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 ...
  • 551
1 vote
1 answer
118 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 ...
2 votes
2 answers
512 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 ...
  • 125
1 vote
1 answer
103 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 ...
  • 1,078
3 votes
2 answers
349 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 ...
  • 141
2 votes
1 answer
824 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 ...
1 vote
3 answers
4k 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?
0 votes
2 answers
1k 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?
0 votes
2 answers
501 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 ...
  • 505
2 votes
1 answer
929 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'...
  • 161
1 vote
1 answer
735 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 ...
  • 1,078
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 ...
  • 71
1 vote
2 answers
549 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 ...
  • 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 ...
  • 33
0 votes
1 answer
79 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 ...
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 ...
1 vote
1 answer
455 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 ...
  • 111
1 vote
2 answers
3k 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 ...
0 votes
2 answers
781 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, ...
0 votes
1 answer
39 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 ...
  • 115
1 vote
1 answer
123 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/...
  • 115
2 votes
2 answers
794 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 ...
0 votes
2 answers
654 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 ...
4 votes
1 answer
407 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
0 votes
2 answers
331 views

Troubles wiring two network rooms with optical fiber and SFP-enabled switches

I'm in charge of the new network installation in the new office of my company, and I have troubles wiring two network rooms (one for servers and incoming internet and the other one for wiring closets) ...
9 votes
6 answers
3k views

Do I need to protect SFP ports and optics from dust/contaminants? If so, how?

I have a used switch with some SFP ports and some SFP modules installed, which I don't use. All new switches come with little rubbery bungs that block up unused SFP ports, but since this old procurve ...
  • 695
5 votes
1 answer
794 views

Non-HP transceiver and HP switch

Does a non-HP single-mode transceiver work in a HP switch, and does a non-HP single-mode transceiver communicate with a single-mode HP transceiver?
-3 votes
1 answer
99 views

What accessories included by default if I buy/order an SFP module

I am buying an SFP module. .I am expecting a duplex LC connector/SFP cable to be included as a default standard accessory.I have not separately mentioned to provide LC connector/SFP cable while ...
5 votes
1 answer
1k views

Must 40/100G uplink ports on a 10G switch be connected to another switch?

I'm looking at a switch like this: https://www.fs.com/products/29123.html It has 48 10-GbE SFP+ ports and 6 40-GbE uplink ports. I would like to use some of these uplinks to cross-connect to another ...
  • 195
1 vote
1 answer
267 views

Intermittent issues on a dark fibre point to point link

After a bit of advice on an intermittent issue i'm investigating. We have two buildings on the same site connected by 548m fibre run that we own and it was installed around 10 years ago. Over the ...
  • 11
1 vote
1 answer
6k views

HP ProCurve 2520G Switch not accepting HP transceiver SFP

I first tried a non HP optical transceiver, received the error: Not an HP Networking transceiver Called HP they said I need to order a HP branded optical transceiver part no 468508-002 so I did. $...