NETGEAR GS748T User Manual

148
GS748T Smart Switch
• Interface Queue Configuration on page 150
• 802.1p to Queue Mapping on p
age 152
• DSCP to Queue Mapping on p
age 153
Basic CoS Configuration
Use the Trust Mode Configuration page to set the class of service trust mode of an interface.
Each port in the switch can be configured to trust one of the packet fields (802.1p or IP
DSCP), or to not trust any packet’s priority designation (untrusted mode). If the port is set to a
trusted mode, it uses a mapping table appropriate for the trusted field being used. This
mapping table indicates the CoS queue to which the packet should be forwarded on the
appropriate egress port(s). Of course, the trusted field must exist in the packet for the
mapping table to be of any use, so there are default actions performed when this is not the
case. These actions involve directing the packet to a specific CoS level configured for the
ingress port as a whole, based on the existing port default priority as mapped to a traffic class
by the current 802.1p mapping table.
Alternatively, when a port is configured as untrusted, it does not trust any incoming packet
prio
rity designation and uses the port default priority value instead. All packets arriving at the
ingress of an untrusted port are directed to a specific CoS queue on the appropriate egress
port(s), in accordance with the configured default priority of the ingress port. This process is
also used for cases where a trusted port mapping is unable to be honored, such as when a
non-IP packet arrives at a port configured to trust the IP DSCP value.
To display the Basic CoS Configuration page, click Qo
S  Basic  CoS Configuration.

NETGEAR GS748T Specifications

General

Basic switching RJ-45 Ethernet ports quantity	48
MAC address table	16000 entries
Packet buffer memory	1.632 MB
Maximum data transfer rate	1 Gbit/s
Latency	20 µs
I/O ports	48 RJ-45 connectors for 10BASE-T, 100BASE-TX, and 1000BASE-T (Auto Uplink on all ports) 4 SFP slots for fiber Gigabit Ethernet modules
Dimensions (WxDxH)	440 x 260 x 43 mm
Power requirements	100-240VAC 50/60 Hz
Networking features	10BASE-T, 100BASE-TX, 1000BASE-T
Connectivity technology	Wired
Full duplex	Yes
Networking standards	IEEE 802.3x
Minimum system requirements	Category 5 network cables Network card for each PC Network software (e.g., Windows)
Mean time between failures (MTBF)	69930 h
Safety	UL listed (UL 1950)/cUL, IEC950/EN60950
LED indicators	Link, Power
Power consumption (typical)	70 W
Storage temperature (T-T)	-10 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 90 %

Weight and Dimensions

Weight	4000 g