Hardware¶

Physical Setup / Board Stacking¶

The hardware consists of two circuit boards:

• Top board: AC/DC power supply and Ethernet switch
• Bottom board: Actual Femtocell mainboard

The two boards are sandwiched together by the following connections:

• 6-pin fine-pitch connector (most likely for DC power)
• flexible printed circuit cable (most likely for Ethernet MII/RMII)
• two large sheet metal parts for ground and/or thermal connection

It is thus not very straight forward to operate the opened device in a safe way (i.e. without live AC line voltage present).

We will be working on a way to operate it with injected safe low DC voltage, but that is still TBD.

Major Components¶

Femtocell SoC¶

Broadcomm BCM61610KFB1G (formerly Percello)

• no information found anywhere

NAND Flash¶

Hynix H27U1G8F2BTR

• 1Gbit (128MByte) NAND Flash, x8 data bus, 3.3V, 2k page size, 128k erase block, 48pin TSOP1
• http://natisbad.org/NAS/refs/Hynix_NAND_128Mo_H27U1G8F2BT.pdf

RF Transceiver¶

Maxim MAX2550

• Band I, V, and VIII WCDMA Femtocell Transceiver with GSM Monitoring
• https://www.maximintegrated.com/en/products/comms/wireless-rf/MAX2550.html
• https://datasheets.maximintegrated.com/en/ds/MAX2550.pdf
• https://www.maximintegrated.com/en/app-notes/index.mvp/id/5364

Ethernet Switch¶

Connectors¶

Mainboard J2¶

• 12pos 2x6 1.27mm pitch header
• unpopulated
• likely JTAG and/or console

Mainboard J3¶

• 30pos 0.5mm pitch FPC
• connects to PSU Board CON1
• likely LED + Ethernet

Mainboard J4¶

• 3pos 2.54mm pitch hader, center pos missing
• used to supply 230V AC from mainboard to PSU board
• connects to PSU Board J4

Mainboard J5¶

• 8pos 2x4 1.27mm pitch SMD header
• likely DC power
• connects to PSU-Board J