# Other Sapphire Wall-E 325e e3fc ## Description NST-1R RevB3 (Remote Only) ## Project Details - **Owner:** tompowers - **Created:** 3/12/2026 - **Last Updated:** 3/12/2026 - **Visibility:** Public - **Manufacturing Quantity Target:** Prototype - **Reliability Target (MTBF):** Prototype - **Connectivity:** RJ45 (cable under test) + RS-485 time-sliced - **Power Requirements:** USB-C 5V charge input, LiPo battery - **System Architecture:** ```mermaid flowchart TD Phone["Android Phone App"] -->|"USB-C CDC ACM"| NST1["NST-1 Dongle"] NST1 -->|"HF/TIA Stimulus+Measure"| Cable["RJ45 Cable Under Test"] Cable --> NST1R["NST-1R Remote"] subgraph Comm["Time Sliced Remote Comm"] NST1 -->|"RS-485 19.2k"| Cable Cable -->|"RS-485 19.2k"| NST1R NoteA["Comm window enabled"] end subgraph Measure["HF Measurement Window"] NoteB["Comm front end disconnected"] end subgraph PairAgile["Pair Agile Discovery"] Mux["Diff Mux or Crosspoint"] Relay["Hard Disconnect Switch"] Term["120R Termination switchable"] Mux --> Relay Relay --> Term end NST1 --> Mux NST1R --> Mux ``` - **Project Variant:** NST-1R Remote RevB3 - **Domain:** NST-1R Remote - **Board Profile:** SDI - **Project Phase:** Proto - **Stackup:** Standard 4 Layer - **Stars:** 1 ## Key Components ### J2 — [7499010121A](https://www.flux.ai/adrian95/7499010121a.md) - Datasheet URL: https://www.we-online.com/components/products/datasheet/7499010121A.pdf - Role: Connector - Manufacturer Part Number: 7499010121A - Role Details: RJ45 to cable under test - Part Type: Connector - Package or Case Code: 7499010121A - Package: Through Hole - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Würth Elektronik **Pins:** - ~ [pin 9] - ~ [pin 10] - ~ [pin 11] - ~ [pin 12] - 8 [pin 8] - CRD [pin 5] - CTD [pin 2] - NC [pin 7] - RD- [pin 6] - RD+ [pin 4] - SHIELD1 [pin Z1] - SHIELD2 [pin Z2] - TD- [pin 3] - TD+ [pin 1] ### J3 — [A-2004-2-4-LP/S-R](https://www.flux.ai/adrian95/a-2004-2-4-lps-r.md) - Package: Through Hole - Part Type: Connector - Manufacturer Name: ASSMANN WSW components GmbH - License: https://creativecommons.org/licenses/by/4.0/ - Connector Type: Modular / Ethernet Connectors - Datasheet URL: http://www.assmann-wsw.com/uploads/datasheets/ASS_7322_CO.pdf - Manufacturer Part Number: A-2004-2-4-LP/S-R - Role: Connector - Role Details: PLACEHOLDER shielded right-angle THT RJ45 8P8C; pins 7/8 used for RS-485 (replace with TE 2496558-1 when symbol+footprint available) **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - MH1 [pin MH1] - MH2 [pin MH2] ### J3 — [7499010121A](https://www.flux.ai/adrian95/7499010121a.md) - Datasheet URL: https://www.we-online.com/components/products/datasheet/7499010121A.pdf - Role Details: RJ45 to cable under test - Manufacturer Part Number: 7499010121A - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Package: Through Hole - Manufacturer Name: Würth Elektronik - Part Type: Connector - Package or Case Code: 7499010121A **Pins:** - ~ [pin 9] - ~ [pin 10] - ~ [pin 11] - ~ [pin 12] - 8 [pin 8] - CRD [pin 5] - CTD [pin 2] - NC [pin 7] - RD- [pin 6] - RD+ [pin 4] - SHIELD1 [pin Z1] - SHIELD2 [pin Z2] - TD- [pin 3] - TD+ [pin 1] ### K1 — [G6HU-2](https://www.flux.ai/kicad-part-library/g6hu-2.md) - Package or Case Code: Relay_DPDT_Omron_G6H-2 - Role: Relay - Manufacturer Part Number: G6HU-2 - Manufacturer Name: Texas Instruments Inc. - Package: Through Hole - Part Type: Relay THT - Datasheet URL: http://cdn-reichelt.de/documents/datenblatt/C300/G6H%23OMR.pdf - Role Details: DPDT latching relay to isolate RS-485 and termination from cable during HF/TIA measurements **Pins:** - ~ [pin 9] - ~ [pin 10] - ~ [pin 2] - ~ [pin 1] - ~ [pin 4] - ~ [pin 8] - ~ [pin 3] - ~ [pin 7] - NC [pin 6] - NC [pin 5] ### K2 — [G6HU-2](https://www.flux.ai/kicad-part-library/g6hu-2.md) - Package or Case Code: Relay_DPDT_Omron_G6H-2 - Role: Relay - Datasheet URL: http://cdn-reichelt.de/documents/datenblatt/C300/G6H%23OMR.pdf - Role Details: DPDT latching relay to isolate RS-485 and termination from cable during HF/TIA measurements - Part Type: Relay THT - Package: Through Hole - Manufacturer Part Number: G6HU-2 - Manufacturer Name: Texas Instruments Inc. **Pins:** - ~ [pin 9] - ~ [pin 10] - ~ [pin 2] - ~ [pin 1] - ~ [pin 4] - ~ [pin 8] - ~ [pin 3] - ~ [pin 7] - NC [pin 6] - NC [pin 5] ### LED1 — [LTST-C190KRKT](https://www.flux.ai/adrian95/ltst-c190krkt.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://optoelectronics.liteon.com/upload/download/DS-22-99-0151/LTST-C190KRKT.pdf - Part Type: LED - Manufacturer Name: Lite-On Inc. - Manufacturer Part Number: LTST-C190KRKT - Package: LED_0603 - Role: Indicator - Role Details: Red status LED (Charge/Fail) **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [LTST-C190KRKT](https://www.flux.ai/adrian95/ltst-c190krkt.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package: LED_0603 - Role: Indicator - Datasheet URL: https://optoelectronics.liteon.com/upload/download/DS-22-99-0151/LTST-C190KRKT.pdf - Part Type: LED - Manufacturer Name: Lite-On Inc. - Manufacturer Part Number: LTST-C190KRKT - Role Details: Red status LED (Charge/Fail) **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [SML-LX0603GW-TR](https://www.flux.ai/adrian95/sml-lx0603gw-tr.md) - Role: Indicator - Manufacturer Part Number: SML-LX0603GW-TR - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Datasheet URL: https://www.lumex.com/spec/SML-LX0603GW-TR.pdf - Manufacturer Name: Lumex Opto/Components Inc. - Role Details: Green COMM-OK LED - Package: LED_0603 **Pins:** - A [pin 2] - K [pin 1] ### LED4 — [LTST-C190TBKT](https://www.flux.ai/adrian95/ltst-c190tbkt.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: LTST-C190TBKT - Role: Indicator - Manufacturer Name: Lite-On Inc. - Part Type: LED - Datasheet URL: https://optoelectronics.liteon.com/upload/download/DS-22-99-0224/LTST-C190TBKT.PDF - Role Details: Blue PASS LED - Package: LED_0603 **Pins:** - A [pin 2] - K [pin 1] ### Q1 — [BC817-16W-7](https://www.flux.ai/jecstronic/bc817-16w-7.md) - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds30575.pdf - Package: SOT-23-3 - Part Type: Transistor - Manufacturer Part Number: BC817-16W-7 - Manufacturer Name: Diodes Incorporated - Role Details: Low-side NPN coil driver for G6HU-2 relay, controlled by RELAY_EN_* nets - License: https://creativecommons.org/licenses/by/4.0/ - Role: Relay Driver **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q2 — [BC817-16W-7](https://www.flux.ai/jecstronic/bc817-16w-7.md) - Role: Relay Driver - Package: SOT-23-3 - Role Details: Low-side NPN coil driver for G6HU-2 relay, controlled by RELAY_EN_* nets - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds30575.pdf - Manufacturer Part Number: BC817-16W-7 - Part Type: Transistor - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Diodes Incorporated **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### U1 — [MAX3485ESA+](https://www.flux.ai/lcsc/max3485esaplus.md) - Package or Case Code: SO-8_L4.9-W3.9-P1.27-LS6.0-BL - Manufacturer Name: MAXIM(美信) - JLCPCB Part Class: Extended Part - Role: Transceiver - Role Details: RS-485 half-duplex transceiver for pair-agile remote comm - Manufacturer Part Number: MAX3485ESA+ - LCSC Part Number: C1545222 - Package: SO-8 **Pins:** - ~{RE} [pin 2] - A [pin 6] - B [pin 7] - DE [pin 3] - DI [pin 4] - GND [pin 5] - RO [pin 1] - VCC [pin 8] ### U2 — [MAX3485ESA+](https://www.flux.ai/lcsc/max3485esaplus.md) - LCSC Part Number: C1545222 - Role: Transceiver - Manufacturer Part Number: MAX3485ESA+ - Package: SO-8 - Role Details: RS-485 half-duplex transceiver for pair-agile remote comm - Package or Case Code: SO-8_L4.9-W3.9-P1.27-LS6.0-BL - Manufacturer Name: MAXIM(美信) - JLCPCB Part Class: Extended Part **Pins:** - ~{RE} [pin 2] - A [pin 6] - B [pin 7] - DE [pin 3] - DI [pin 4] - GND [pin 5] - RO [pin 1] - VCC [pin 8] ### U3 — [SN74CBTLV3257DBQR](https://www.flux.ai/adrian95/sn74cbtlv3257dbqr.md) - Manufacturer Part Number: SN74CBTLV3257DBQR - Package: SSOP-16 - Manufacturer Name: Texas Instruments - Role: Analog Switch - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Datasheet URL: https://www.ti.com/lit/ds/symlink/sn74cbtlv3257.pdf - Role Details: Pair-agile routing matrix for RS-485 lines to RJ45 pairs **Pins:** - ~OE [pin 15] - 1A [pin 4] - 1B1 [pin 2] - 1B2 [pin 3] - 2A [pin 7] - 2B1 [pin 5] - 2B2 [pin 6] - 3A [pin 9] - 3B1 [pin 11] - 3B2 [pin 10] - 4A [pin 12] - 4B1 [pin 14] - 4B2 [pin 13] - GND [pin 8] - S [pin 1] - VCC [pin 16] ### U4 — [SN74CBTLV3257DBQR](https://www.flux.ai/adrian95/sn74cbtlv3257dbqr.md) - Part Type: Integrated Circuit - Package: SSOP-16 - License: https://creativecommons.org/licenses/by/4.0/ - Role: Analog Switch - Datasheet URL: https://www.ti.com/lit/ds/symlink/sn74cbtlv3257.pdf - Manufacturer Part Number: SN74CBTLV3257DBQR - Role Details: Pair-agile routing matrix for RS-485 lines to RJ45 pairs - Manufacturer Name: Texas Instruments **Pins:** - ~OE [pin 15] - 1A [pin 4] - 1B1 [pin 2] - 1B2 [pin 3] - 2A [pin 7] - 2B1 [pin 5] - 2B2 [pin 6] - 3A [pin 9] - 3B1 [pin 11] - 3B2 [pin 10] - 4A [pin 12] - 4B1 [pin 14] - 4B2 [pin 13] - GND [pin 8] - S [pin 1] - VCC [pin 16] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/tompowers/other-sapphire-wall-e-325e-e3fc](https://www.flux.ai/tompowers/other-sapphire-wall-e-325e-e3fc).* --- *Generated from [https://www.flux.ai/tompowers/other-sapphire-wall-e-325e-e3fc](https://www.flux.ai/tompowers/other-sapphire-wall-e-325e-e3fc)*