NETGEAR GS324T User Manual

S350 Series 24-Port (PoE+) and 48-Port Gigabit Ethernet Smart Managed Pro Switches
Configure System Information User Manual47
Configure an SNTP Server
SNTP assures accurate network device clock time synchronization up to the millisecond.
Time synchronization is performed by a network SNTP server. The switch operates only as
an SNTP client and cannot provide time services to other systems.
Time sources are established by strata. Strata define the accuracy of the reference clock.
The higher the stratum (where zero is the highest), the more accurate the clock. The device
receives time from Stratum 1 and above since it is itself a Stratum 2 device.
The following is an example of strata:
• Stratum 0.
A real-time clock is used as the time source, for example, a GPS system.
• Stratum 1.
A server that is directly linked to a Stratum 0 time source is used. Stratum 1
time servers provide primary network time standards.
•
Stratum 2. The time source is distanced from the Stratum 1 server over a network path.
For example, a Stratum 2 server receives the time over a network link, through NTP
, from
a Stratum 1 server.
Information received from SNTP servers is evaluated based on the time level and server
type.
SNTP time definitions are assessed and determined by the following time levels:
•T1. Time that the original request was sent by the client.
•T2. Time that the original request was received by the server.
•T
3. Time that the server sent a reply.
•T
4. Time that the client received the server's reply.
The device can poll unicast server types for the server time.
Polling for unicast information is used for polling a server for which the IP address is known.
SNTP servers that were configured on the device are the only ones that are polled for
synchronization information. T1 through
T4 are used to determine server time. This is the
preferred method for synchronizing device time because it is the most secure method. If this
Server Stratum The claimed stratum of the server for the last received valid packet.
Reference Clock ID The reference clock identifier of the server for the last received valid packet.
Server mode The mode of the server for the last received valid packet.
Unicast Server Max
Entries
The maximum number of unicast server entries that can be configured on this client.
Unicast Server
Current Entries
The number of current valid unicast server entries configured for this client.
Broadcast Count The number of unsolicited broadcast SNTP messages that were received and processed
by the SNTP client since the last reboot.
Table 10. SNTP Global Status information (continued)
Field Description

NETGEAR GS324T Specifications

General

Switch type	Managed
Switch layer	L2/L3/L4
ARP inspection	Yes
Master (outer) case width	270 mm
Master (outer) case height	271 mm
Master (outer) case length	481 mm
Master (outer) case weight	8850 g
Harmonized System (HS) code	85176990
Quantity per master (outer) case	3 pc(s)
Package type	Box
Package depth	465 mm
Package width	229 mm
Package height	79 mm
Package weight	2710 g
Cables included	AC
Stackable	-
Product color	Black
Input current	5 A
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (max)	13.5 W
Operating temperature (T-T)	0 - 40 °C
MAC address table	16000 entries
Power connector	AC-in jack
SFP module slots quantity	2
Installed SFP modules quantity	0
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Basic switching RJ-45 Ethernet ports quantity	24
Number of VLANs	256
Networking standards	IEEE 802.1D, IEEE 802.1Q, IEEE 802.1ab, IEEE 802.1p, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3az, IEEE 802.3x
Virtual LAN features	Private VLAN, Voice VLAN, Port-based VLAN
DHCP features	DHCP client

Weight and Dimensions

Depth	169 mm
Width	328 mm
Height	43 mm
Weight	1620 g