The D-Link DSL-274xB is a four port wireless router with integrated ADSL2+ modem. The x differentiates the ADSL Annex supported; 0 is Annex A and 1 is Annex B.
As with all BCM63XX devices, there is no support for the integrated DSL modem.
| Version/Model || OpenWrt Version Supported || Model Specific Notes
| C2/C3 || trunk || -
| E || n/a || external switches are not supported yet
| F1 || 12.09-rc2, 15.05 || switch configuration is incorrect in some releases, working well till 12.09-rc2 and since 15.05
OEM easy installation
These devices can be easily flashed through the generic CFE recovery webserver:
Switch Ports (for VLANs)
Numbers 0-3 are Ports 1-4 as labelled on the unit, in reverse order (so internal port 0 is external 3, 1 is 2, etc).
| || Revision C2,C3 || Revision E1 || Revision F1
| Architecture: || MIPS
| Vendor: || Broadcom
| Bootloader: || CFE
| System-On-Chip: || BCM6358 || BCM6328
| CPU/Speed || 4Kc 300 Mhz || 4Kc 320 Mhz
| Flash-Chip: || varies
| Flash size: || 4096 KiB || 8192 KiB
| RAM: || 32 MiB || 64 MiB
| Wireless: || Broadcom BCM4321 802.11bgn || Atheros AR9287 802.11bgn
| Ethernet: || Broadcom BCM5325e || Realtek RTL8306 || (integrated in SoC)
| Internet: || ADSL2+ (unsupported)
| USB: || No
| Serial: || Yes, Pin Header
| JTAG: || No
Opening the case
Note: This will void your warranty!
For Revision C2 (and probably C3):
For Revision F1
This model is tricky to open as it has a total of seven plastic clips holding the top. You might need brute force, and there are chances you will damage your case.
Remove the screws under all four rubber feet
For the front clips: using two flat head screw drivers push bottom "grill" out until you can lift the top slightly
For the front side clips: using a flat head screw driver push the bottom out until it clicks (slide it in from the corner, then work yourself to where the clip is)
For the back side clips: these should be easy now with some wiggling
See port.serial for general information about the serial port, serial port cable, etc.
The Pinout is (with the Ethernet ports on top):
Wireless - for Revision F1
Install package kmod-ath9k
Reverting to original Firmware
For reverting to the original firmware, obtain the firmware from D-Link and flash it using the OEM easy installation.
D-Link DSL-2740B H/W Ver.: C2 identical to
D-Link DSL-2740U H/W Ver.: C2
Flash chip: 4MBytes MX29LV320CTTC-70G MX29LV320CTTC MX29LV320 29LV320