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CGFEB1xxx-1xxx
24-Hour Technical Support: 1-800-260-1312 -- International: 00-1-952-941-7600
Operation—continued
Product features -- continued
Pause
The pause feature is used to temporarily suspend data transmission in order to
relieve buffer congestion. If a media converter needs some time to clear network
congestion, it will send a pause signal to the media converter at the other end, which
will wait a predetermined amount of time before re-transmitting the data. This
feature reduces data bottlenecks, allowing for a more efficient use of the network
devices and prevents the loss of valuable data.
In Hardware mode, the pause feature can be set to the following:
•
Disable
(i.e., no pause)
•
Enable
(i.e., symmetrical pause)
In Software mode, the pause feature can be set to one of four settings:
•
Disable
(i.e., no pause)
•
Symmetrical pause
•
Asymmetric TX (
transmit)
pause
•
Asymmetric RX
(receive)
pause
Note:
Enable the pause feature if it is present on ALL network devices attached to
the media converter(s). Otherwise, disable the pause feature.
SNMP
See the on-line documentation that comes with Transition Networks FocalPoint
™
software for applicable commands and usage.
Use SNMP at an attached terminal or at a remote location to monitor the media
converter by monitoring:
•
Copper and fiber link status
•
Copper and fiber port duplex
•
Copper port speed
Use SNMP to enter network commands that:
•
Enable/Disable Link pass through
•
Enable Disable VLAN Port 1 to Port 2/Port 2 to Port1
•
Yes/No Factor Reset
•
Yes/No Reset Counters
•
Yes/No Reset Switch
Ports 1 and 2
•
Administrative Status Pass Traffic/Do Not Pass Traffic
• Auto-Neigotiation
(Always Disabled)
•
Far-End Fault Enable/Disable
• Duplex
(Full/Half)
•
Egress Rate Limits
(Unlimited and Incremental)
•
Priority 0 Ingress Rate Limits
(Unlimited and Incremental)
•
Default forward unknown muliticasts
(enabled/disabled)
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11
CGFEB1xxx-1xx
Operation—continued
Product features -- continued
•
Forward unknown unicast
(enabled/disabled)
•
VLAN tagging
(normal/untag/tag/double tag)
•
Discard tagged frames
(Enabled/Disabled)
•
Discard untagged frames
(Enabled/Disabled)
• Use
IP
(Enabled/Disabled)
• Use
tag
(Enabled/Disabled)
•
Tag if both
(Use Tag/Use IP)
• Default
priority
(1 thru 7)
• Default
VID
•
IEEE priority remapping
(Tags 0 thru 7)
IEEE802.1q VLAN tagging and double tagging
(Q in Q)
The 802.1Q specification establishes a standard method for inserting virtual LAN
(VLAN) membership information
(called a tag into Ethernet frames to break large
networks into smaller parts or to address security concerns)
. Q in Q support simply
adds another layer of IEEE 802.1Q tag to the 802.1Q tagged packets that enter the
network. The purpose is to expand the VLAN space by tagging the tagged packets,
thus producing a "double-tagged" frame.
VLAN tagging can be configured to one of the following settings:
•
Normal = frames are unmodified when passing through the converter.
•
Untag = all tagged frames will have their tag removed when passing through
converter.
•
Tag = all untagged frames are tagged with the source port default VLAN ID.
•
Double Tag = all egress frames are double tagged using the source port default
VLAN ID for the extra tag. This also enables ingress double tag removal.
Ingress:
a. Frame does not contain a tag—frame is not modified
b. Frame contains one 802.3ac tag—tag is removed
c. Frame contains two 802.3ac tags—the first tag is removed
Egress:
a. Frame is untagged—tag is added
b. Frame contains one 802.3ac tag—tag is added before the current one
becomes the frames new 802.3ac tag
IEEE802.1p QoS, IPv4 ToS/Diffserv, IPv6 Traffic class
The 802.1p specification is an extension of the IEEE 802.1Q standard and works in
tandem to define Ethernet frame priorities for traffic class expediting and dynamic
multicast filtering. IEEE 802.1p establishes eight levels of priority
(0 ~ 7)
with 7
being the highest priority. Each egress Ethernet frame can be prioritized using IEEE
802.1p
(MAC level)
Traffic Class, or IPV4 TOS and/or DiffServ and/or IPV6 Traffic
Class.
