View source for S+RJ10 general guidance

== Summary ==

[https://mikrotik.com/product/s_rj10 MikroTik S+RJ10] is a unique 6-speed RJ-45 SFP+ module that is based on a Marvell 88X3310P transceiver. It offers up to 10 Gbps speeds using twisted-pair copper cables. All of the current MikroTik 
devices that have an SFP+ cage support S+RJ10 module. This article serves as a guideline of the S+RJ10 usage in MikroTik devices with passive and active cooling.

== General Guidance ==
==== Product specification ====
The average power consumption of the transceiver is 2.7 W (10GBASE-T, 30 m link). The operating temperature is 0 to +70 C, but the transceiver itself can heat up to 90 C.

==== S+RJ10 Positioning in devices ====

Due to high operating temperatures, we are recommending to use S+RJ10 transceivers with optical transceiver or unused SFP+ interface in between them. Take a look on the transceivers capable distance [https://wiki.mikrotik.com/wiki/MikroTik_SFP_module_compatibility_table#S.2BRJ10 comparison table].
{| class="wikitable"
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|[[file:20190129 125436.jpg|600px|center|thumb|alt=Alt text|Recommended S+RJ10 placement]]
[[file:20190130 125357.jpg|600px|center|thumb|alt=Alt text|We do not recommend to place transceivers side by side]]
| As mentioned, S+RJ10 heat up more than regular transceivers and keeping them side by side will heat them more than necessary, especially in devices with 4 linear SFP cages. We are recommending to place S+RJ10 in every second interface with keeping optical transceiver or empty port in between them.
|}

{| class="wikitable"
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| Even devices which come with separated SFP+ cages, for example CRS309-1G-8S+, we still do not recommend to use S+RJ10 transceivers beside each other. Use S+RJ10 in every second interface to avoid transceivers overheating which may cause unpredictable errors.
|[[file:20190129 125301.jpg|600px|center|thumb|alt=Alt text|Recommended S+RJ10 placement]]
[[file:20190129 125325.jpg|600px|center|thumb|alt=Alt text|We do not recommend to place transceivers side by side]]
|}

{| class="wikitable"
|-
|[[file:20190130 134631.jpg|600px|center|thumb|alt=Alt text|Recommended S+RJ10 placement]]
[[file:20190130 134505.jpg|600px|center|thumb|alt=Alt text|We do not recommend to place transceivers side by side]]
| Devices which come with 4 or 8 block SFP+ cages are not exceptions. We are recommending to use one S+RJ10 transceiver peer 4xSFP+ cage block and avoiding placing them side by side. Keep at least one vertical row empty(without S+RJ10) after plugged S+RJ10 transceiver.
|}

== Using S+RJ10 side by side ==

It is not always possible to place transceivers in proper order. In cases where two or more S+RJ10 transceivers are plugged in beside, network administrator has to ensure additional cooling for such setup. It can be increased air flow or overall environment temperature refrigeration to keep transceiver temperature below recommended 90C.