Edu-IT Posted December 11, 2014 Posted December 11, 2014 I'm not too sure what I am on about here, so work with me! I have a switch that has one of these in where the fibre is connected to: J4131A - HP - HP J4131A Procurve Sx Transceiver Module (Refurbished) However I am looking into upgrading the switch in the area to a 1Gbps 24 port switch. Is there a HP switch that exists on the market today that would still accept these what I believe are fibre SX cables? Most now seem to reference SFP ports?
localzuk Posted December 11, 2014 Posted December 11, 2014 That transceiver has SC connectors from the looks of it. You don't need to have it accept SC cables. You can go from whatever is at your patch panel to whatever connector your switch accepts - most commonly LC now AFAIK. So, you'd get a SFP module which has LC socket at the front end (such as this - HP ProCurve Gigabit-SX-LC Mini-GBIC | Comms Express) and, assuming the patch panel is SC, you'd want a new patch cable such as LC - SC Multimode Duplex Fibre Patch Leads | Comms Express 1
Edu-IT Posted December 11, 2014 Author Posted December 11, 2014 Ah. I see. I didn't even contemplate swapping the cable! Thank you.
Davit2005 Posted December 11, 2014 Posted December 11, 2014 That looks like an SC connector. If you can't change the cable a Media Converter may be the only way.
localzuk Posted December 11, 2014 Posted December 11, 2014 When you swap the cable, make sure you choose a new patch lead that matches the old fibre type (eg. 50/125 or 62.5/125), else you'll have issues - that's the most important part. Also, you need to match the transceiver types at each end - as they need to be operating the same standard. ie. If you have 1000Base-SX at one end, you need 1000Base-SX at the other end too.
Edu-IT Posted December 11, 2014 Author Posted December 11, 2014 (edited) Well it's J4131A at one end at the moment so I assume it's currently 1000Base-SX at the other end too as it's all working fine. So if I stick to 1000Base-SX (if that's possible) I won't have to replace two bits? Is that right? Edit: For the switch I am looking at it's part J4858C http://www.misco.co.uk/product/43063/HP-Networking-Gigabit-SX-LC-Mini-GBIC-Module which is Cabling Type Ethernet 1000Base-SX according to the spec. Edited December 11, 2014 by Edu-IT
localzuk Posted December 11, 2014 Posted December 11, 2014 Yup. That SFP module I linked earlier should connect up to the SX module at the other end without issue in theory.
m25man Posted December 11, 2014 Posted December 11, 2014 As per @localzuk says do make sure your new patch cables match the rest of your cable run. Be aware if your backbone cabling is older OM1 62.5 fibre make sure your patch cords match. Do not mix 62.5 and 50/125 on the same run. The effects can range from indifferent to catastrophic dependent on use and overall run length. Each mismatched patch introduces around 3db of attenuation (half your power) effectively reducing the distance between end points so that packet of data over the 200m fibre run effectively runs out of steam at half distance (theoretically). You wouldn't believe the number of so called dead switches and GBICs that I have brought back to life by cleaning cable ends and switching over to the correct patch cords. On short runs you can get away with a lot I've even seen single mode cords in a Multimode link still working. Optics just need a little care and understanding if you want to get the best performance from them.
Edu-IT Posted December 11, 2014 Author Posted December 11, 2014 I will have a look at the cable. Hopefully it's marked on it?
m25man Posted December 11, 2014 Posted December 11, 2014 62.5/125 OM1 is normally good for 275m at 1Gb but only if it has been terminated well and is clean. Most of these installations are 10 yrs + old and were originally expected to be 10/100 and another reason to ensure you don't mismatch the patch cords. Do yourself and everyone else a favour and ID your fibre Backhaul cabling by labelling the fibre panels with the correct size on a label it's so much easier when yo know what's under the floor.
Edu-IT Posted December 12, 2014 Author Posted December 12, 2014 Where can I find what SNMP values I need to monitor on a HP ProCurve switch in order to view traffic etc?
pcstru Posted December 12, 2014 Posted December 12, 2014 Get a MIB Browser and have a look! They should be a table below .1.3.4.1.2.1.2.2 which lists stats for each port. (.iso.org.dod.internet.mib-2.interfaces.iftable).
pcstru Posted December 12, 2014 Posted December 12, 2014 You can use a MIB browser to look at the tree structure that is available for SNMP queries. HP switches should conform to RFC1213-MIB. You need to traverse down the tree to the branch I said, where you will find a table which lists various stats (tx,rx, errors etc) for each of the interfaces on the device. Is that any clearer? What software are you trying to connect to the device?
Edu-IT Posted December 12, 2014 Author Posted December 12, 2014 Right, so is there any way to monitor across all the ports? I don't see anything here in this list for that?
pcstru Posted December 12, 2014 Posted December 12, 2014 If you select the ifTable node in the left hand panel and then click on the table icon in the menu bar, then press start. You can set up mtrg to continually monitor switches and allow you to easily accumulate pull stats running over weeks, months and years.
Edu-IT Posted December 12, 2014 Author Posted December 12, 2014 But there's no OID value then that would give me that figure?
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