17
votes
How come SFP modules are so incompatible?
How come different SFP modules work with different vendors only?
It's actually the other way around. SFP modules have no logic to see where they are used. Network devices may check compatibility and ...
- 81.5k
16
votes
Accepted
Trying to get 10 gigabit connection over a switch with 100 megabit standard gateway
I don't think the default gateway has anything to do with your problem. Local traffic between two devices on the same subnet doesn't flow through the default gateway and in any case the speeds you are ...
- 13k
12
votes
Accepted
Do I need to protect SFP ports and optics from dust/contaminants? If so, how?
Do I need to protect the physical empty SFP port? What's a good way to do so?
Empty SFP slots should be covered when not in use, so no dust is sucked up by the system fan - depending on how dusty the ...
- 81.5k
12
votes
How come SFP modules are so incompatible?
In reality they are very compatible.
I almost never use the official vendor SFPs and never had any issue (but I always use two well known third-party SFP vendors).
There's two main points for vendors ...
- 19.4k
11
votes
Why is 10Gb SFP+ port showing 4.3Gbps Speed?
Just to address the SNMP portion of your question, I'm guessing that you are seeing the 4.3Gbps result from querying the SNMP object 'ifSpeed'. If so, you are simply getting back the maximum value ...
- 111
10
votes
Accepted
SFP+ transceiver's ability to do 1GbE
Short answer: in theory yes, in practice no.
Long answer:
There are SFP+ optics which can also work at 1 GbE, I've talked (sorry, no other source than that) to people who were experimenting with it ...
- 186
10
votes
Fiber between two sites - no signal lights
OM1 or OM3 makes a lot of difference. Please check https://en.wikipedia.org/wiki/Multi-mode_optical_fiber . You will see that OM1 cable can carry 10G for 33 meters while OM3 can carry it for 300 ...
- 335
9
votes
Accepted
Must 40/100G uplink ports on a 10G switch be connected to another switch?
That switch uses (Q)SFP+ ports which are essentially PHYless. You need to either use matching PHY type transceivers on both the switch and the host ports (e.g. 10GBASE-SR or 40GBASE-SR4) or direct-...
- 81.5k
9
votes
Fiber between two sites - no signal lights
300m of OM1 will NOT work with 10GBASE-SR, as JFL and kaya atabey have already pointed out. From 2003, it's quite likely OM2 which won't work with 10G-SR either at that distance. Additionally, patch ...
- 81.5k
9
votes
Accepted
Do you need SFP on both ends?
That is perfectly fine and normal. You do not need a transceiver on both ends - just whichever side you intend to use an SFP/SFP+/QSFP port on. All you would need to account for is that they operate ...
- 4,690
8
votes
Fiber between two sites - no signal lights
From the J9150D datasheet you linked, the max transmission distance over an OM1 fiber is 33m.
Thus you need other transceivers, or to change the fiber.
- 19.4k
7
votes
Accepted
Is possible to stack/uplink different brands of switches using SFP?
Yes you can uplink different brand of switches using SFP.
The term stacking in this context means that several switches act as a single one. This is always a proprietary (and model dependent) feature,...
- 19.4k
7
votes
What accessories included by default if I buy/order an SFP module
SFP modules are overwhelmingly sold without a patch cable. In fact, I've never seen an SFP transceiver being offered in a set with a patch cable.
In addition to the existence of various connector ...
- 81.5k
7
votes
Do I need to protect SFP ports and optics from dust/contaminants? If so, how?
Cisco writes the following about the dust caps:
For optical SFP transceiver modules, before removing the dust plugs
and making any optical connections, observe the following guidelines:
...
- 1,732
7
votes
Accepted
Will OM4 Fiber Work with my 1GbE Fiber Transceiver?
As per IEEE 802.3 Clause 38, 1000BASE-SX requires OM2 (500 MHz·km for 850 nm) for max. 550 m reach. As a superset, OM4 is fine as well (there's little point buying OM2). With 10GBASE-SR the reach over ...
- 81.5k
7
votes
Accepted
Latency of 10G fiber SFP+
Latency of 10GBASE-SR/-LR vs SFP+ DAC is very closely the same - in contrast to 10GBASE-T which adds appr. 1.5 μs.
Majorly, latency is caused by the line encoding overhead. In the case of -R PHYs, ...
- 81.5k
6
votes
Are there any advantages in using optic fiber to connect a host computer to an Ethernet LAN?
There's several advantages to Fiber-to-the-desk
length: copper cabling is limited to 90 meters of horizontal cabling (leaving 10 meters for patching). Fiber doesn't have this limitation. In some ...
- 19.4k
6
votes
Accepted
LACP and how to configure switches correctly
Your ethernet SFP/SFP+ for fiber are going to be 1 or 10 Gbps. There isn't a 2 Gbps ethernet fiber SFP (some vendors used to count this way because of full duplex, but it is still 1 Gbps in each ...
- 98.3k
6
votes
Accepted
Does QSFP+ require 4 fibers?
QSFP+ is just the transceiver interface. Medium compatibility and reach is defined by the PHY used by the fitted transceiver.
While the short-range 40GBASE-SR4 PHY requires four separate multi-mode ...
- 81.5k
6
votes
How to connect QSFP+ transceiver with MPO connector and SFP+ transceiver with LC connector?
You need a breakout cable - MPO to 8x LC. The reach of the cable depends on the PHY that is used, e.g. 400 m for 10GBASE-SR over OM4, or 10 km for 10GBASE-LR over OS2.
Make sure that the transceivers ...
- 81.5k
6
votes
Accepted
new SFP network for newbies
SFP is a standard for modular network ports. Essentially, the empty SFP slot is "PHY-less" until you plug in a module - with an Ethernet SFP port, you can plug in a 1000BASE-T module for twisted pair, ...
- 81.5k
5
votes
Accepted
Why is 10Gb SFP+ port showing 4.3Gbps Speed?
Little late to the website so you may have moved on but, We use Solarwinds. Under the edit node properties there is a check box for 64-bit counters. It is probably not checked. Seen the problem you've ...
- 261
5
votes
Accepted
How to connect 3rd party SFP to the cisco switch?
I'm afraid the real solution is to use either Cisco transceivers or third-party transceivers - from reputable vendors- that are specifically "tagged" to be used on Cisco switches.
Using random ...
- 19.4k
5
votes
Accepted
Non-HP transceiver and HP switch
from comment
HPE switches with pre-16.x firmware require original or HP-compatible transceivers. A transceiver that's not HPE branded is not activated when inserted, as indicated by LED and in the ...
- 81.5k
5
votes
Do I need to protect SFP ports and optics from dust/contaminants? If so, how?
Do I need to protect the physical empty SFP port? What's a good way to do so?
Need to? Generally speaking no you don't need to do so. I have seen equipment used in construction trailers for years ...
- 27.2k
5
votes
SFP-10G-LRM compatible with Single Mode Fiber?
It can use multimode, but it doesn't have to:
The Cisco 10GBASE-LRM Module also supports link lengths of 300m on
standard Single-Mode Fiber (SMF, G.652).
From the data sheet.
- 66.9k
5
votes
Accepted
10G SFP+ transceiver with OM4 fiber cable - Maximum cable length?
If you have not already bought and installed the cable then you should install single mode fiber instead and use LR transcievers. This is the officially supported way to do links of that distance at ...
- 13k
5
votes
Accepted
SFP to SFP going through multiple environments – segmented or via single cable?
should I use a single fiber between two server rooms or split it into segments for easier maintenance/replacement?
Fiber doesn't require any maintenance. If you provide decent protection (duct, tube) ...
- 81.5k
5
votes
SFP to SFP going through multiple environments – segmented or via single cable?
Every connection introduces signal loss, albeit small. (at the distance you're talking, you could string together patch cables and still maintain enough signal for SR signaling.)
It's common practice ...
- 31.5k
4
votes
SFP+ on Juniper EX3300
Out of the box, the EX3300 has the last two SFP ports in Virtual-Chassis mode (ge-0/1/2 and ge-0/1/3).
Use:
request virtual-chassis vc-port delete pic-slot 1 port 2
request virtual-chassis vc-port ...
- 9,381
Only top scored, non community-wiki answers of a minimum length are eligible