NETGEAR GS748T User Manual

198
GS748T Smart Switch
Storm Control
A broadcast storm is the result of an excessive number of broadcast messages
simultaneously transmitted across a network by a single port. Forwarded message
responses can overload network resources and/or cause the network to time out.
The switch measures the incoming broadcast/multicast/unknown unicast packet rate per port
and d
iscards packets when the rate exceeds the defined value. Storm control is enabled per
interface, by defining the packet type and the rate at which the packets are transmitted.
To display the Storm Control page, click Secu
rity  Traffic Control, and then click the Storm
Control link.
To configure storm control settings:
1. Select the
check box next to the port to configure. Select multiple check boxes to apply
the same setting to all selected ports. Select the check box in the heading row to apply
the same settings to all ports.
2. From t
he Ingress Control Mode menu, select the mode of broadcast affected by storm
control.
• Disable.
Do not use storm control.
• Unknown Unicast.
If the rate of unknown L2 unicast (destination lookup failure)
traffic ingressing on an interface increases beyond the configured threshold, the traffic
will be dropped.
• Mult
icast. If the rate of L2 multicast traffic ingressing on an interface increases
beyond the configured threshold, the traffic will be dropped.
• Broa
dcast. If the rate of L2 broadcast traffic ingressing on an interface increases
beyond the configured threshold, the traffic will be dropped.

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