Linksys LGS326P User Manual

22
Clock Source
System time can be set manually by the user, or dynamically from an SNTP server. If an SNTP
server is chosen, the manual time settings are overwritten when communications with the server
are established.
As part of the boot process, the device always configures the time, time zone, and DST. These
parameters are obtained from SNTP, values set manually, or if all else fails, from the factory
defaults.
•
Manual—User must manually set the time.
•
SNTP—Time can be received from SNTP time servers. SNTP ensures accurate network
time synchronization of the device up to the millisecond by using an SNTP server for the
clock source. When specifying an SNTP server, if choosing to identify it by hostname,
three suggestions are given in the GUI:
o
time-a.timefreq.bldrdoc.gov
o
time-b.timefreq.bldrdoc.gov
o
time-c.timefreq.bldrdoc.gov
Note—SNTP is the recommended method for time setting.
SNTP Modes
The device can receive system time from an SNTP server in one of the following ways:
•
Client Broadcast Reception (passive mode)—SNTP servers broadcast the time,
and the device listens to these broadcasts. When the device is in this mode, there
is no need to define a Unicast SNTP server.
•
Client Broadcast Transmission (active mode)—The device, as an SNTP client,
periodically requests SNTP time updates. This mode works in either of the
following ways:
o
SNTP Anycast Client Mode—The device broadcasts time request packets
to all SNTP servers in the subnet, and waits for a response.
o
Unicast SNTP Server Mode—The device sends Unicast queries to a list of
manually-configured SNTP servers, and waits for a response.
The device supports having all of the above modes active at the same time and selects the
best system time received from an SNTP server, according to an algorithm based on the
closest stratum (distance from the reference clock).
Time Zone and Daylight Savings Time (DST)
The Time Zone and DST can be set on the device in the following ways:
•
Dynamic configuration of the device through a DHCP server, where:
•
Dynamic DST, when enabled and available, always takes precedence over the manual
configuration of DST.

Linksys LGS326P Specifications

General

Switch type	Managed
Switch layer	-
Quality of Service (QoS) support	Yes
Combo SFP ports quantity	2
Installed SFP+ modules quantity	0
Gigabit Ethernet (copper) ports quantity	26
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Basic switching RJ-45 Ethernet ports quantity	24
10G support	No
Number of VLANs	128
Networking standards	IEEE 802.1D, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3af, IEEE 802.3az, IEEE 802.3u, IEEE 802.3x, IEEE 802.3z
Virtual LAN features	Tagged VLAN
Copper ethernet cabling technology	1000BASE-T, 100BASE-T, 10BASE-T
DHCP features	DHCP client
Security algorithms	802.1x RADIUS
Throughput	38.69 Mpps
Jumbo frames	9000
MAC address table	8000 entries
Product color	Black, Blue
LED indicators	Activity, Link, PoE, System
Number of fans	2 fan(s)
Memory type	DRAM
Internal memory	128 MB
Input current	3.5 A
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (typical)	28.58 W
Total Power over Ethernet (PoE) budget	192 W
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 50 °C
Operating relative humidity (H-H)	10 - 90 %

Weight and Dimensions

Depth	200 mm
Width	440 mm
Height	44 mm
Weight	3096 g