Linksys E4200

From DD-WRT Wiki

(Difference between revisions)
Jump to: navigation, search
Revision as of 20:47, 18 April 2011 (edit)
Picchioni (Talk | contribs)
(Hardware Specifications)
← Previous diff
Revision as of 15:32, 21 April 2011 (edit) (undo)
Mrichmon (Talk | contribs)
(Wireless-N Configuration)
Next diff →
Line 68: Line 68:
* Both the 2.4 and 5GHz Radios run at a stock transmitting power of 100mW, decreasing the transmitting power to a value between 40 & 50mW has seemed to help stability. * Both the 2.4 and 5GHz Radios run at a stock transmitting power of 100mW, decreasing the transmitting power to a value between 40 & 50mW has seemed to help stability.
 +
 +=== 5GHz Wireless transfer speed ===
 +
 +When WMM is enabled speed will drastically decrease. When disabled normal speeds are achieved.
 +Recommendation from LiteUp! and basmaf
 +* Disable WMM & Enable Frame burst
 +* Reports of highest transfer rates achieved on Upper channel 161
 +* Example settings are in the wiki of [[Linksys_E3000|E3000]]
 +* Be patient let SNR settle down before testing.
== References == == References ==
# [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86316&postdays=0&postorder=asc&start=210|Linksys e4200 build thread] at dd-wrt forum # [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86316&postdays=0&postorder=asc&start=210|Linksys e4200 build thread] at dd-wrt forum
# [https://fjallfoss.fcc.gov/oetcf/eas/reports/ViewExhibitReport.cfm?mode=Exhibits&RequestTimeout=500&calledFromFrame=N&application_id=699190&fcc_id='Q87-E4200'|<nowiki>FCC</nowiki> disclosures ] # [https://fjallfoss.fcc.gov/oetcf/eas/reports/ViewExhibitReport.cfm?mode=Exhibits&RequestTimeout=500&calledFromFrame=N&application_id=699190&fcc_id='Q87-E4200'|<nowiki>FCC</nowiki> disclosures ]

Revision as of 15:32, 21 April 2011

Contents

Hardware Specifications

Image:e4200.jpg


CPU Broadcom BCM4718
CPU Speed 480 MHz
Flash ROM 16 MB
Macronix MX25L12845E
RAM 64 MB
Radios 2.4 GHz, 5 GHz
WLAN Support a/b/g/n
WLAN Max Speed 300mbps (2.4 GHz) & 450mbps (5 GHz)
Antenna Location Internal (x6)
Bands 3 x 3
Switch 4x GigE + 1 WAN
Broadcom 53115
IEEE 802.3/3u/3ab
USB 1x USB 2.0

Radio wl0 is Broadcom 4718 (SoC)

Radio wl1 is Broadcom 4331 Intensi-fi Single-Chip 802.11n Transceiver

Flashing

Warnings

  • The E4200 is very sensitive to the nvram size. The only safe nvram size identified for this router is an nvram size of 60kB. Recovery from a firmware with the wrong nvram size requires use of a jtag cable to erase the nvram.1
  • Support for the E4200 is still very much a work in progress at this time, outstanding issues reported have included WAN stability, and both 2.4GHz and 5GHz Radio stability.

Flashing Process

  • Perform these steps when flashing from the stock linksys GUI:
  1. Disconnect all cables and wireless clients.
  2. Perform a 30/30/30 reset on the device.
  3. Flash the latest E4200 specific mini build (dd-wrt.v24-<build number>_NEWD-2_K2.6_mini-e4200.bin) to the router.
  4. Wait approximately 5 minutes for the flashing process to complete.
  5. Perform a 30/30/30 after the device has successfully updated.
  6. Flash to larger build of your choosing (Mega, Big, std_usb_nas, OpenVPN, VoIP.)
    • WARNING Only flash -nv60k builds, flashing anything else to the router will brick it as noted above (dd-wrt.v24-<build number>_NEWD-2_K2.6_<build type>-nv60k.bin)
  7. If flashing to another build always perform a 30/30/30 before and after flashing.

Wireless-N Configuration

  • Both the 2.4 and 5GHz Radios run at a stock transmitting power of 100mW, decreasing the transmitting power to a value between 40 & 50mW has seemed to help stability.

5GHz Wireless transfer speed

When WMM is enabled speed will drastically decrease. When disabled normal speeds are achieved. Recommendation from LiteUp! and basmaf

  • Disable WMM & Enable Frame burst
  • Reports of highest transfer rates achieved on Upper channel 161
  • Example settings are in the wiki of E3000
  • Be patient let SNR settle down before testing.

References

  1. e4200 build thread at dd-wrt forum
  2. FCC disclosures