GbLAN

Gigabit LAN

The PS3 has 1 Gigabit Ethernet port. The port accepts Auto-MDIX (automatic medium-dependent interface crossover), so no need for special crosscables when hooking up the PS3 direct to the PC.

Gigabit LAN chips used

A sample of the GbLAN chips in different PS3 models:

Ports	Size	Speed	Voltage	Packaging	Manufacturer	Serial Number	Description
8 (3 used)	20x20mm	Xtal X3501: 25MHz	3.3V/1.9V/1.2V	144-pin TQFP	Marvell Alaska	88E6108-LAR1	Used in earlier models (up to CECHGxx/SEM-001)
?	?	?	?	?	Marvell Alaska	88E6106-LKJ1	Used in later models (CECHHxx/DIA-001)
?	?	?	?	?	?	?	DIA-002 (CECHJxx, CECHKxx)
?	?	?	?	?	?	?	VER-001 (CECHLxx, CECHMxx, CECHPxx, CECHQxx)
-	-	125MHz	3.3V, 2.5V or 1.8V	64-pin QFN	Marvell Alaska	88E1118R-NNC2	Used in Slim models (CECH-20xx/DYN-00x and CECH-21xx/SUR-001)
-	6,5x6,5mm	-	-	48-pin	Marvell Alaska	88E1310-NNB2	Used in Slim models (CECH-25xx/JTP-001/JSD-001, CECH-30xx/KTE-001)
?	?	?	?	?	?	?	superslims ?

Jumbo frames

From Linux perspective (under OtherOS <=3.15), the old drivers set the MTU to 2308, while newer versions set the MTU of 1518. This could be a hypervisor restriction (needs research).

MTU is set with vsh using syscall net_ioctl (libnet)

On 3.41 firmware, with a modified ps3_gelic driver, frames of 1624 bytes can be sent and frames of 1628 bytes can be received.

Efficiency

Frame type	Layer 1 overhead		Layer 2 overhead		MTU	Layer 3 overhead	Layer 4 overhead	Payload size	Total transmitted	Efficiency
Standard	preamble 8 byte	IPG 12 byte	frame header 14 byte	FCS 4 byte	1500	IPv4 header 20 byte	TCP header 20 byte	1460 byte	1538 byte	94.93%
old gelic					2308			2268 byte	2346 byte	96.68%
new gelic					1518			1478 byte	1556 byte	94.99%
mod gelic					1624			1584 byte	1662 byte	95.31%