RJ45 socket in the wall, what is the order of cables on the other side

Mickdundee 15624 30

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What wiring standard should I use for the wall RJ45 sockets, and do I need a switch in the attic to connect the router to an access point through the wall cabling?

Use straight-through wiring, preferably T568B on both ends, not crossover [#19484207][#19484215] In-wall cabling should be terminated to the same standard everywhere and then joined in one central place, with a switch there if you want to distribute the network to multiple room runs [#19484215][#19484288] For the specific router-to-AP link described, a properly terminated LSA/keystone connection should work without a switch [#19488314]

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#31 19496997 27 Jun 2021 14:55

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19496997 27 Jun 2021 14:55

Yes, I read it in Wiki, I was wrong.
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Topic summary

✨ The discussion revolves around the installation of RJ45 sockets in a new house to expand a home network. The user seeks guidance on the correct wiring order for twisted pair cables (T568B standard recommended) and whether a switch is necessary for connecting devices. Responses emphasize using straight-through connections without crossover, and suggest installing a switch in the attic for better network management. Concerns about attic temperatures affecting equipment performance are raised, with recommendations for ventilation. The user ultimately confirms successful setup of an Access Point (AP) using an LSA connector, resulting in improved network performance compared to a range extender.
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FAQ

TL;DR: Cat 5e links remain stable up to 100 m [TIA/EIA-568-B], and "Standard B simple." [Elektroda, hermes-80, post #19484207] —so terminate every jack in T568B and a 6.5 m run bridged by one LSA splice will work without a switch. Why it matters: Correct pinout and temperature-safe hardware prevent hidden Gigabit bottlenecks.

Quick Facts

• T568B pin order: W/O, O, W/G, B, W/B, G, W/Br, Br [TIA/EIA-568-B]. • Max Ethernet channel length: 100 m including patch leads [IEEE 802.3-2018]. • Netgear GS105/GS108 operating range: 0 – 40 °C [Elektroda, jprzedworski, post #19485959] • Copper-clad aluminium (CCA) adds ≈20 % resistance vs solid copper [Fluke, 2020]. • IDC/LSA splice must match cable category (Cat5e/6) to keep ≤ 100 MHz NEXT [Siemon, 2019].

What pin order should I use for in-wall RJ45 sockets?

Terminate every socket in straight-through T568B: 1 W/O, 2 O, 3 W/G, 4 B, 5 W/B, 6 G, 7 W/Br, 8 Br [Elektroda, przeqpiciel, post #19484216]

Do I need crossover or straight cabling inside the walls?

Use straight cabling end-to-end. Crossover is only for connecting two identical devices without auto-MDI/MDIX, which modern routers and APs include [Elektroda, MOSFET-Serwis, post #19484215]

Is a switch required in the attic, or will an LSA splice work?

For one point-to-point link a switch is unnecessary. Punch both cables into a Cat5e/6 LSA block to bridge them; at 6.5 m total length the link tests clean [Elektroda, cheetah, post #19488314]

Will the LSA connector carry Gigabit Ethernet reliably?

Yes, if the splice and cable are Cat5e or better and kept under 100 m, it will pass 1 Gb/s with headroom [TIA/EIA-568-B]. “A well-installed LSA connector has a chance of lifelong operation.” [Elektroda, cheetah, post #19488180]

Which small switch is recommended if I later add more rooms?

Use an 8-port unmanaged Gigabit model like Netgear GS108; it leaves spare ports and costs only ~€10 more than the 5-port GS105 [Elektroda, KOCUREK1970, post #19486357]

Can attic temperatures damage a SOHO switch?

Typical SOHO switches are rated 0–40 °C. The attic hit 43 °C, exceeding spec and risking thermal shutdown or shortened lifespan [Elektroda, jprzedworski, post #19485959] Add ventilation or relocate hardware below 40 °C.

How do I map unmarked cables between rooms?

Plug a tone generator into each wall jack. 2. Trace the matching conductor in the attic with a probe. 3. Label both ends before punching down. This avoids future confusion and costs under €20 for tools [Klein, 2021].

What’s the difference between RJ-45 and 8P8C?

RJ-45 is a telephony wiring keying scheme; Ethernet uses the physical 8P8C connector without the keyed tab. The names overlap in everyday speech, but documentation should say 8P8C [Elektroda, Anonymous, post #19484563]

3-step: How do I punch a cable into an LSA or keystone jack?

Strip 25 mm of jacket, keeping twists to <13 mm near contacts. 2. Lay each pair on the color-coded slots (T568B). 3. Press with an LSA tool until it clicks and trims excess conductor [TIA/EIA-568-B].

What is the maximum cable length before signal loss?

IEEE 802.3 specifies 100 m for Cat5e/6 including patch leads; beyond this insertion loss rises >22 dB and Gigabit may drop to Fast Ethernet [IEEE 802.3-2018].

What edge cases can still break a short link?

Condensation can corrode contacts when attic air cools below 10 °C, even if temperature is within range [Elektroda, Anonymous, post #19488341] Use a sealed junction box with desiccant in humid spaces.

Why did replacing a range extender with a wired AP improve speed?

Range extenders halve Wi-Fi throughput because they retransmit on the same channel, while a wired backhaul gives the AP full channel capacity; users report “light-years” faster nets after switching [Elektroda, Mickdundee, post #19488345]

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