D-Link DSL-2500U/BA/D4B wired router Black vs D-Link DSL-2540U/BA/T1D wired router Fast Ethernet

Comparison of DSL-2500U/BA/D4B, DSL-2540U/BA/T1D

26 specifications	A D-Link DSL-2500U/BA/D4B wired router Black Model DSL-2500U/BA/D4B View product	B D-Link DSL-2540U/BA/T1D wired router Fast Ethernet Model DSL-2540U/BA/T1D View product
WAN connectionidentical
Ethernet WAN	Yes	Yes
DSL WAN	Yes	Yes
Networkidentical
Ethernet LAN	Yes	Yes
Ethernet LAN data rates	10,100 Mbit/s	10,100 Mbit/s
Ethernet interface typeKnown for one	—Unknown — not stated by the source	Fast Ethernet
Cabling technologyKnown for one	—Unknown — not stated by the source	10/100Base-T(X)
DSL featuresidentical
ADSL2+	Yes	Yes
Management featuresidentical
Web-based management	Yes	Yes
Quality of Service (QoS) support	Yes	Yes
Universal Plug and Play (UPnP)	Yes	Yes
Reset button	Yes	Yes
Ports & interfaces1 differ
Ethernet LAN (RJ-45) portsDiffers	1	4
RJ-11 ports quantity	1	1
Protocolsidentical
DHCP client	Yes	Yes
DHCP server	Yes	Yes
DMZ support	Yes	Yes
Securityidentical
Firewall security	Network address translation (NAT) firewall, Stateful packet inspection (SPI) firewall	Network address translation (NAT) firewall, Stateful packet inspection (SPI) firewall
MAC address filtering	Yes	Yes
URL filtering	Yes	Yes
IP address filtering	Yes	Yes
Filtering description	ICMP, TCP, UDP	ICMP, TCP, UDP
NAT functionalityKnown for one	y	—Unknown — not stated by the source
Designidentical
Product colourKnown for one	Black	—Unknown — not stated by the source
LED indicators	Yes	Yes
On/off switch	Yes	Yes
Other features1 differ
Supported WAN typeDiffers	PPPoA PPPoE IPoE IPoA Bridge	ADSL: PPPoA, PPPoE,IPoE, IPoA, Bridge Ethernet: IPoE, PPPoE, Bridge

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.