Thank you for your correction Nik.
B.S.C.M. I.T.T. Tech
A.A.S. I.T.T. Tech
Original Message:
Sent: 06-05-2025 16:51
From: Nikolay Semov
Subject: SFP+ SRX300 HOW, best practices.
"I2C cable" is a misnomer. I2C is a chip-to-chip communication protocol that devices happen to use to talk to a connected SFP module (not another device over a cable, but the plugged in SFP module itself). That's how a device controls and gets information from the module about what kind it is, who the manufacturer is, the serial number, etc., as well as other operational parameters such as temperature, signal levels, etc., etc., as applicable.
So if you have a DAC cable, or any other SFP module really, that cable / module has a chip that communicates with the device you plug it into.
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Nikolay Semov
Original Message:
Sent: 06-05-2025 15:55
From: eugene1973
Subject: SFP+ SRX300 HOW, best practices.
fb35523
I'm glad you commented. I'll make a note. Would you happen to know anything about i2c cables? I want the cable I use to plug into the srx300 sfp ports, but also my Avaya switch cluster. I suppose if you know of Avaya ers series might be of help. But maybe that was another member.
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Adrian Aguinaga
B.S.C.M. I.T.T. Tech
(Construction Management)
A.A.S. I.T.T. Tech
(Drafting & Design)
Original Message:
Sent: 06-05-2025 03:18
From: fb35523
Subject: SFP+ SRX300 HOW, best practices.
While you are basically correct, some manufacurers have designed 1 G DAC cables and call them 1000Base-Cu. I do, however, not think they are described in the MSAs (multi source agreements, basically the "standards" that describe how SFPs etc. are supposed to work). This means they probably tell the switch that they are something else, like a 1000Base-T or -SR SFP to be compliant. I would make very sure I can return the 1 G DAC if I were to test it in an SRX of any sort.
Original Message:
Sent: 06-05-2025 02:19
From: CHARLES RAYER
Subject: SFP+ SRX300 HOW, best practices.
Just for clarity, there are no 1Gb/s DACs. All DAC cables are either 10Gb/s, 25Gb/s or faster. They will not work in an SFP socket and therefore an SRX300.
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CHARLES RAYER
Original Message:
Sent: 06-04-2025 19:19
From: eugene1973
Subject: SFP+ SRX300 HOW, best practices.
I thank you for your comments and the list. I'm going to get that sfp cable for sfp and sfp+ ports because it's obviously worth investigation. As per item 4 I object. But then again maybe I need full investigations.
Kudos Nikolay
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Adrian Aguinaga
B.S.C.M. I.T.T. Tech
(Construction Management)
A.A.S. I.T.T. Tech
(Drafting & Design)
Original Message:
Sent: 06-04-2025 13:06
From: Nikolay Semov
Subject: SFP+ SRX300 HOW, best practices.
The connection speed depends entirely on the transceiver you use.
Whether the transceiver is compatible with your router / switch depends on multiple documented and not-so-documented factors.
- SFP transceiver should work in an SFP port <-- not guaranteed
- SFP+ transceiver should work in an SFP+ port <-- not guaranteed
- SFP transceiver should mostly work in an SFP+ port <-- not guaranteed
- SFP+ transceiver WILL NOT work in an SFP port <-- guaranteed
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Nikolay Semov
Original Message:
Sent: 06-03-2025 19:26
From: eugene1973
Subject: SFP+ SRX300 HOW, best practices.
Thx, I'm now wondering if sfp and sfp+ might have more complicated issues communicating with each other? More specifically, since sfp + or not seems to transceiver specific at times. Can anyone confirm 1g/10g interfaces(switches or routers) are connection specific per speed? With this I mean that a 1g selected speed needs a 1g cable/transceiver, dac or not. CONFIRM I MEAN. Doesn't mean that other setups will use a 10g cable for 1g. I know this already. So, I'm asking if someone is using a 1g dac or even fibre that requires a 1g cable/transceiver?
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Adrian Aguinaga
B.S.C.M. I.T.T. Tech
(Construction Management)
A.A.S. I.T.T. Tech
(Drafting & Design)
Original Message:
Sent: 06-03-2025 02:14
From: fb35523
Subject: SFP+ SRX300 HOW, best practices.
I'm not really sure what your question is actually. The only Juniper related question in your post is about the SRX300, which (as you describe) only has SFP, not SFP+ ports apart from the 1000Base-T ports. In order to help with 10 G transceivers for SRX devices, one needs to know the model. Here, you can find the supported hardware options (SFPs etc.) for all Juniper devices:
https://apps.juniper.net/hct/home/
The first model that has 10 G SFP+ support is the SRX380, then SRX1500, SRX1600 and up. Generally, Juniper supports all MSA compliant modules so any decent plug should work. Apparently only Juniper original plugs are supported by Juniper, but they won't decline a case just because there happens to be an alien plug in the box.
Support regarding Windows 2012 CALs, x520 (whatever that is) and Proset stuff hardly belongs here.
Original Message:
Sent: 06-02-2025 18:12
From: eugene1973
Subject: SFP+ SRX300 HOW, best practices.
.
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Adrian Aguinaga
B.S.C.M. I.T.T. Tech
(Construction Management)
A.A.S. I.T.T. Tech
(Drafting & Design)
Original Message:
Sent: 06-01-2025 16:44
From: eugene1973
Subject: SFP+ SRX300 HOW, best practices.
Any suggestions. I'm reviving the post.
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Adrian Aguinaga
B.S.C.M. I.T.T. Tech
(Construction Management)
A.A.S. I.T.T. Tech
(Drafting & Design)
Original Message:
Sent: 03-23-2025 22:39
From: eugene1973
Subject: SFP+ SRX300 HOW, best practices.
Can someone suggest to me the network adapters and cables I can use with srx 1g and 10g sfp+ ports? I have an srx300 but I want to start using 10g on an srx series. The srx300 only has 1g ports. I assume dac might be more complicated, but fibre is part of my need too. I use windows server 2012r2 because I have many Cals, but maybe that's outdated. Either way I'm successful 100% at present. But maybe nobody will speak on that. I cannot for the life of me get the x520's running. I currently have sfp+ running on a Trendnet switch/router. Both 10g and 1g are on my topology with the Trendnet. I think the drivers for the x520 might be corrupt. Does anyone have a place they know I can download x520 drivers? I have the proset version 20.0 . I will gladly send an email address to anyone with this.
Srx300-c
--- JUNOS 15.1X49-D60.7 built 2016-09-13 22:27:47 UTC
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Adrian Aguinaga
B.S.C.M. I.T.T. Tech
(Construction Management)
A.A.S. I.T.T. Tech
(Drafting & Design)
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