# GigaBlox Nano: PicoBlade pinout, carrier-side LSHM numbering and RJ45 cable mapping

**URL:** <https://forum.botblox.org/t/gigablox-nano-picoblade-pinout-carrier-side-lshm-numbering-and-rj45-cable-mapping/657>\
**Category:** BotBlox Hardware\
**Tags:** gigablox-nano\
**Created:** [October 9, 2026, 3:45pm UTC](https://forum.botblox.org/t/gigablox-nano-picoblade-pinout-carrier-side-lshm-numbering-and-rj45-cable-mapping/657 "2026-10-09T15:45:36Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![botblox\_admin](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.botblox.org/botblox_admin/32/1_2.png) [@botblox\_admin](https://forum.botblox.org/u/botblox_admin)\
**Post date:** [October 9, 2026, 3:45pm UTC](https://forum.botblox.org/t/gigablox-nano-picoblade-pinout-carrier-side-lshm-numbering-and-rj45-cable-mapping/657/1 "2026-10-09T15:45:36Z")

</div>

## Question

When designing a carrier board for GigaBlox Nano that mates directly to the LSHM-120 connector and uses 8-pin Molex PicoBlade Ethernet connectors, what is the pin number for each Ethernet signal? Figure 7 in datasheet A\_H shows C−, C+, D+, D−, B+, B−, A+, A− along the connector, but does not label pin 1.

Does Figure 11 use carrier-side LSHM-120 pin numbering, with VBUS on pins 2 and 4 and GND on pins 1, 3 and 39? Is the BB-PBRJ1-8-0.3 cable numerically 1:1 between PicoBlade and RJ45?

## Answer

For the 8-pin PicoBlade connector in our PicoConn reference design, the signal mapping is:

- Pin 1: C−
- Pin 2: C+
- Pin 3: D+
- Pin 4: D−
- Pin 5: B+
- Pin 6: B−
- Pin 7: A+
- Pin 8: A−

Yes, Figure 11 in the [GigaBlox Nano datasheet A\_H](https://store-l0hv1zrcre.mybigcommerce.com/content/GigaBlox%20Nano%20DataSheet%20A_H.pdf) uses carrier-side LSHM-120 numbering: VBUS on pins 2 and 4; GND on pins 1, 3 and 39. Table 3 uses module-side numbering, with the mating relationship shown in Table 2.

The BB-PBRJ1-8-0.3 cable is not numerically 1:1 to RJ45. PicoBlade pins 1–8 map to RJ45 pins 5, 4, 7, 8, 3, 6, 1, 2, as shown in the [BB-PBRJ1-8-0.3 cable drawing](https://store-l0hv1zrcre.mybigcommerce.com/content/BotBlox%20BB-PBRJ1-8-0.3%20Datasheet.pdf).