VMG1312 Vs VMG3925: Difference between revisions

Latest revision as of 12:06, 24 Haziran 2020

Thais page describes the differences between the ZyXEL VMG1312-B10D and the ZyXEL VMG3925-B10B routers.

The main differences are

VMG3925 is more expensive
VMG3925 has 2.4 and 5G WiFi radio, the VMG1312 has only 2.4G
VMG3925 has Gigabit Ethernet ports, the VMG1312 has 100M ports
VMG3925 is physically larger, even though they are a similar shape
VMG3925 has a dedicated WAN Ethernet port, the VMG1312 has a shared LAN/WAN Ethernet port
VMG3925 has a better wall mount

In terms of hardware differences between the router:

The main difference, is the addition of an additional 5 GHz wireless radio alongside the existing 2.4 GHz band one. This is of benefit to customers in areas where the 2.4 GHz band is heavily congested.

5 GHz does NOT have a "longer reach" than 2.4 GHz, so it will not help in cases of signal attenuation. It does however help in cases where the 2.4 GHz band has too many other devices on it.

It was believed that the VMG3925 has an extra common-mode noise filter on the telephone line, but this is not the case.

This router also has a dedicated WAN port, for FTTP. No configuration is necessary to turn this on, or off. It is enabled by default.

The other difference is that instead of 100MBit/sec LAN ports on the router, it has 1GBit/sec LAN ports. This may be beneficial for FTTP customers as to not have the LAN ports becoming a bottleneck.

Detailed differences

	VMG1312-B10D	VMG3925-B10B	VMG3925-B10C

Notes
Dimensions with stand (mm)	160Wx115Hx60D	185Wx147Hx85D	180Wx145Hx29.8D
Wall mountable	Suboptimal	Yes	Yes
PSU Rating	12V 1A	12V 2A	12V 2A
CPU/SoC	Broadcom BCM63381	Broadcom BCM63168
Architecture	BMIPS4350	BMIPS4350
CPU Cores	2	2
CPU Frequency	600 MHz	400 MHz
RAM	64MB	128MB
Flash	128MB	128MB
Switch chipset	On board the BCM63381 SoC	BCM53125(Discrete)
LAN Ethernet	4 Ports 10/100M (To SoC)	4 Ports 10/100/1000M (To Switchchip)
WAN Ethernet	Virtual port from LAN 4	Dedicated 10/100/1000M port (To Switchchip)	10/100/1000M ports
Wireless Protocols	802.11 b/g/n	802.11 a/b/g/n/ac	802.11 a/b/g/n/ac
2.4 GHz Wireless	Yes	Yes	Yes
2.4 GHz radio chains	2	2
2.4 GHz chipset	BCM43227 (Discrete)	BCM6362 (On BCM63168 SoC)
5 GHz Wireless	No	Yes	Yes
5 GHz radio chains	N/A	3	3
5 GHz chipset	N/A	Broadcom BCM43602 (Discrete) SKY85712-21 RF Front-End
xDSL Chipset	Broadcom BCM6303 ADSL/VDSL	Broadcom BCM6302 ADSL/VDSL
USB	Yes, 2.0	Yes, 2.0	Yes, 2.0

You may note that the VMG3925-B10B has a slower CPU, however it also contains more dedicated hardware for packet processing compared to the VMG1312-B10D which needed the extra CPU clock cycles to deal with processing packets.

The VMG3925-B10B's SoC contains 1 Gigabit PHY, which connects to the Switch chip for the WAN and LAN ports. Radios are connected to the SoC, so packets passing through WAN/LAN<>WLAN would be limited to the bandwidth of the single Gigabit PHY inside assuming no other limiting factors i.e. WAN speed, WLAN radio bandwidth.

@@ Line 18: / Line 18: @@
 It does however help in cases where the 2.4&nbsp;GHz band has too many other devices on it.
-It's believed that the VMG3925 has an extra common-mode noise filter on the telephone line.
+It was believed that the VMG3925 has an extra common-mode noise filter on the telephone line, but this is not the case.
-[https://forum.kitz.co.uk/index.php/topic,18246.msg324172.html#msg324172 Kitz discussion]
 This router also has a dedicated WAN port, for FTTP. No configuration is
@@ Line 36: / Line 36: @@
 | ||  [[File:Vmg1312-b10d.png|150px]] ||  [[File:VMG3925-B10B-Large.png|200px]] || [[File:VMG3925-B10C-200.png|200px]]
 |-
-| Dimensions with stand (mm)||  160Wx115Hx60D ||  185Wx147Hx85D
+| Notes ||     ||   ||
+|-
+| Dimensions with stand (mm)||  160Wx115Hx60D ||  185Wx147Hx85D ||  180Wx145Hx29.8D
 |-
 | Wall mountable ||   Suboptimal  ||  Yes || Yes
 |-
-| PSU Rating ||   12V 1A  ||  12V 2A
+| PSU Rating ||   12V 1A  ||  12V 2A ||  12V 2A
 |-
 | CPU/SoC ||[https://www.broadcom.com/products/broadband/xdsl/bcm63381 Broadcom BCM63381] || [https://www.broadcom.com/products/broadband/xdsl/bcm63168 Broadcom BCM63168]
@@ Line 58: / Line 60: @@
 | LAN Ethernet || 4 Ports 10/100M <br/>(To SoC)||4 Ports 10/100/1000M <br/> (To Switchchip)
 |-
-| WAN Ethernet || Virtual port from LAN 4 || Dedicated 10/100/1000M port<br/>(To Switchchip)
+| WAN Ethernet || Virtual port from LAN 4 || Dedicated 10/100/1000M port<br/>(To Switchchip) || 10/100/1000M ports
 |-
-| Wireless Protocols || 802.11 b/g/n || 802.11 a/b/g/n/ac
+| Wireless Protocols || 802.11 b/g/n || 802.11 a/b/g/n/ac || 802.11 a/b/g/n/ac
 |-
 | 2.4&nbsp;GHz Wireless || Yes || Yes || Yes
@@ Line 70: / Line 72: @@
 | 5&nbsp;GHz Wireless || No || Yes || Yes
 |-
-| 5&nbsp;GHz radio chains || N/A || 3
+| 5&nbsp;GHz radio chains || N/A || 3 || 3
 |-
 | 5&nbsp;GHz chipset || N/A ||[https://www.broadcom.com/products/wireless/wireless-lan-infrastructure/bcm4360 Broadcom BCM43602] (Discrete)<br/>[http://www.skyworksinc.com/Product/1791/SKY85712-21 SKY85712-21 ] RF Front-End
@@ Line 86: / Line 88: @@
 [[Category:ZyXEL VMG3925 B10B]]
 [[Category:ZyXEL VMG1312 B10D]]
+[[Category:ZyXEL VMG3925 B10C]]