What's the difference between WS-X4548-RJ45V+ and WS-X4548-GB-RJ45V

WS-X4548-RJ45V+VS WS-X4548-GB-RJ45V:

WS-X4548-RJ45V+ overview:

. 48 ports

. 10/100/1000 (RJ-45)

. Cisco IOS Software Release 12.2(50)SG or later

. IEEE 802.3af/at and Cisco prestandard PoE, IEEE 802.3x flow control

. Bandwidth is allocated across six 8-port groups, providing 1 Gbps per port

group

. Capable of up to 30W of inline power per port

. Enterprise and commercial: designed to power next-generation IP phones,

wireless base stations, video cameras, and other PoE devices that require

power up to 30 watts

WS-X4548-GB-RJ45V Cisco Catalyst 4500 PoE IEEE 802.3af 10/100/1000, 48 Ports (RJ-45), the similar product is WS-X4648-RJ45V+E.

WS-X4548-GB-RJ45V:

. 48 ports

. 10/100/1000 (RJ-45)

. Cisco IOS Software Release 12.2(18)EW or later

. IEEE 802.3af and Cisco prestandard PoE, IEEE 802.3x flow control

. Bandwidth is allocated across six 8-port groups, providing 1 Gbps per port

group

. Enterprise and commercial: designed to power IP phones, wireless base

stations, video cameras, and other IEEE-compliant powered devices.