The three gigabit ethernet ports:

Do the three 1000Base-T ports form a switch, managed switch, transparent bridge, or a bus (Hub)? If capable of switching at layer two what standards are manageable? I am wondering if Vlan and Trunking (IEEE 802.1Q) is supported as well as common spanning-tree protocol IEEE 802.1D.

Kmann wrote:
Thank you for your reply. My questions concern layer two functionality. Specifically IEEE 802.1q Vlans and VTP. Since ServerX supports dot1Q I was curious if these interfaces could be assigned vlan membership. I was at the apple store yestrday and I did not think to ask.
There is nothing in the Airport utility management interface to suggest either support for VLANs or trunking. Actually, trunking seems fairly silly on a 3/1 port hub, so even if it were possible, it likely be a waste of time to implement it (after all, any trunk of two would have to uplink either to the 1 WAN port or up the remaining 1 LAN port).
As for VLANs, that could be more useful, but again, there is no ability to manage that -- not in terms of either segregating ports into VLANs nor trunking mulitple 802.1q tagged VLAN down a single port -- even if it's possible on the switch. Again, I'd imagine few users would make use of this function, so even if possible, it'd be a low implementation priority. Especially, since OSX VLAN implementation is very, very crippled (e.g. seems like neither DNS nor mDNS works in OSX VLANs -- see http://discussions.apple.com/thread.jspa?messageID=5425126).
Probably a better question would be is whether the switch/ports can even handle the 1524 byte frame size to handle 802.1q VLAN and/or QoS tags. Probably, the best you could hope for is that the switch just pass along tagged frames as is. Hopefully, it would at least pass on QoS information.
One thing you should know about the AEBS and its gig ethernet ports is anytime you make a MINOR configuration change (like say, adding a user to the airdisk rights), it REBOOTS taking the ethernet ports down along with it -- and whatever connectivity the hosts connected to it have.
For a more full featured inexpensive gigE switch, you might look at the Linksys SRW2008/SRW2016/SRW2024 -- those do VLANs, 802.1q, and trunking.

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Minimal interframe gaps in gigabit ethernet port

Hi ,
Whether someone know the minimum interframe gap in gigabit ethernet port in Cisco switch ,3750.
Also ,would like to know the IEEE standard for the same.
Thanks in advance,
Thomas.

the interframe gap for 1-GB is 96 nanoseconds of 96 bit size.
the minimum IFG for is 96 bit times. (the time it takes to transmit 96 bits of data at the specified data rate)
ie:
10Mbps - 9.6 milliseconds
100Mbps - 960 nanoseconds
1000Mbps - 96 nanoseconds
note: you may not want to decrease an IFG smaller than 9.6 microseconds if all other hosts are only capable of 9.6 ms. (10mbps connections)
interframe gap shrinkage could occur to the point where the gap is too small.
if you have a gap that is too small, it will not allow the NIC enough time to switch between TX/RX states and packets could be lost.
please see these links for more IFG info:
http://www.ethermanage.com/ethernet/ch13-ora/ch13.html
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ethernet.htm

Using both Dual Gigabit Ethernet Ports

Using both Dual Gigabit Ethernet Ports
If I plugged both of my ethernet ports into my LAN switch, that would double the bandwidth to and from my machine. A switch does not used shared bandwidth like a hub does. I realize that it won't speed up any of the other devices that are plugged into the switch. Regardless, I would have the capacity for double the bandwidth to my machine.
All LAN cables are CAT6 and the switch is 10/100/1000.
The question is, would Mac OS X 10.4.7 utilize both ports (soft of the way it uses multiple processors)?

It's easy to try... it's call "Link Aggregation"...
http://docs.info.apple.com/article.html?artnum=304120
You get to it by Network>Show>Network Port Configurations>New then Port in the popup, then you schould see Port Aggregation. Selt the two ports you wish to combine.

Will on-board Gigabit Ethernet ports on a Cisco 3845 support a 100 Mb SFP?

Hi,
This is a very specific question - hopefully someone has tested this or run into this scenario...
I was trying to connect a Cisco 3845 router to a 100 Mbps circuit. Specifically, I was trying to connect this circuit to the on-board Gigabit Ethernet port (Gig 0/0). This is the port that can be used as either an RJ45 or SFP slot. The only SFP I had was a multi-mode 100 Mbps SFP. When I hooked it up to Gi0/0, I got a message saying the SFP type wasn't supported on the chassis.
I was able to deploy the 3845 and since then I haven't had the correct hardware to recreate the exact scenario. Has anyone experienced this? Is it simply because Gigabit interface on a 3845 won't support a Fast Ethernet (100 Mbps) SFP?
Thanks.

Not all SFP's will just plug in and work. Here are the SFP's that are considered compatible with the 3800 series ISR's.
GLC-LH-SM= Gigabit Ethernet SFP, LC connector, LX/LH transceiver
GLC-SX-MM= Gigabit Ethernet SFP, LC connector, SX transceiver
GLC-ZX-SM= 1000BASE-ZX SFP
CWDM-SFP-1470= Coarse wavelength-division multiplexing (CWDM) 1470-nm SFP Gigabit Ethernet and 1G/2G Fibre Channel (FC)
CWDM-SFP-1490= CWDM 1490-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1510= CWDM 1510-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1530= CWDM 1530-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1550= CWDM 1550-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1570= CWDM 1570-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1590= CWDM 1590-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1610= CWDM 1610-nm SFP Gigabit Ethernet and 1G/2G FC
http://www2.bt.com/static/i/media/pdf/cisco_3800_routers_faq.pdf

MDS9222i Gigabit Ethernet Ports

Hi all,
I have a question about MDS9222i Gigabit Ethernet ports. Are they RJ-45? In other words, to connect one of them to a Gigabit Ethernet RJ-45 port on a Catalyst 4500 supervisor, do I need just a Cat 5e copper cable or are SFPs required?
Thank you in advance,
Gianluca

The mgmt interface supports copper,The 4 ip gigabit interfaceS require a SFP. There is a RJ-45 copper option: DS-SFP-GE-T, or a MM fiber option: DS-SFP-FCGE-SW

Extend Wireless Network using a Telstra technicolor Gateway wireless Router to Airpot extreme but Airport will only except join not extend and I can not get a network on the Airpor Extreme ethernet ports but can ping Airport extreme from Technicolor Rout/

Extend Wireless Network using a Telstra technicolor Gateway wireless Router to Airpot extreme but Airport will only except "join a wireless network (which it does) not "extend a wireless network" (Led turns yellow and I can not get a network working on the Airpor Extreme ethernet ports but can ping Airport extreme from Technicolor Router.
Airport gets it address DHCP.

Funny how I can ping the Extreme but the Hard Ethernet ports dont seem to work correctly.
When the AirPort Extreme is configured to "Join" a wireless network, the Ethernet ports are not enabled.
Oddly, the AirPort Express has a special feature that will allow it to to "Join" virtually any wireless network.....and the Ethernet port can be enabled. So, an Express would work for your purpose to provide an Ethernet connection to the media player. This assumes that the Express is located where it can receive a strong wireless signal from your main router.
Note that the Express will not provide any additional wireless coverage when it "Joins".

Gigabit Ethernet Ports

Can anyone tell me which BT Home HUBs support Gigabit Ethernet, as I wish to obtain a Western Digital MYBOOK WORLD EDITION 2TB Harddrive. So I can Network my Desktop and family Laptops for file sharing and backing up all home computer systems etc. Any info would be helpful on this topic, many thanks in advance.

Hi dynastyuk,
There are some other really cheap alternatives around for gigabit ports...
This for example:
http://www.google.co.uk/products/catalog?hl=en&q=gigabit+switch&cid=18212157716750550582&ei=O2BUTZ2W...
12 quid for a gigabit switch (Just connect all gigabit capable devices into the switch and connect the switch to the homehub)
I hope this helps
Like this post? Give it a Star . If this post answers your question, please Mark it as the Accepted Solution.

Will any Cat5 Ethernet cables work equally well for Gigabit ethernet ports?

I'm almost embarrassed to ask this, but I must. Are some Cat 5 Ethernet cables designed for Gigabit Ethernet? The Airport Extreme Base Station(b/g) uses Gigabit Ethernet for its LAN and WAN ports. I think my Comcast modem's single Ethernet port does, also. Currently, I use a Cat 5 100Mbs cable to connect the modem to the AEBS. So, I'm wondering if I can get faster throughput with a Cat 5 1000Mbs cable (if such a thing exists).

In addition to Bob's comments, it's important to understand that Gigabit Ethernet requires using all four pairs of wires inside the cable ... regardless of whether that cable is CAT-5, CAT-5e, or CAT-6 certified. The real difference of the categories is how high of a frequency can they support. For example CAT-6 is rated for 10 Gigabit traffic. It's not that CAT-5 won't work, but it's not guaranteed to do so.
If you have any Ethernet runs in home that is supplying connections for both data & phone lines on the same cable, you will NOT achieve Gigabit speeds on those cables as the installer used at least one of the necessary pairs for the phone line.

How can I configure one of the gateway NI9792 Ethernet port to communicate with a cRIO PAC ?

Hi NI Engineers,
I intend to use my gateway NI9792 the following way:
1. One Ethernet port for network connection. That's how I'll develop it, download software and monitor my application through my PC at my desk.
2. Can the other port be used to communicate with a cRIO device? If so, how can I do it?
It seems to be a stupid question, but I truly could not work this out!
Thanks in advance,
Luiz
"Together we stand, divided we fall..."
Certified LabVIEW Associate Developer
Solved!
Go to Solution.

Good afternoon, Luiz
Follow the first link to guide which module can be used and other links to the best part of bore configuration CRIO. Any questions please contact us.
How Do I Configure My Time Server on the NI WSN-9791 or NI 9792 Gateway?
http://digital.ni.com/public.nsf/allkb/44FA322FAFF8D58D862575BD00591A54?OpenDocument
NI WSN Product and Configuration Guide
http://zone.ni.com/devzone/cda/tut/p/id/8710
Configuring the Dual Ethernet Ports on Real-Time Controllers
http://digital.ni.com/public.nsf/allkb/67F94BB93BCE32CF86257367006B3659?OpenDocument
video setup and installation CRIO
http://www.ni.com/swf/demos/us/crio/outofbox/
Automatic Network Configuration for cRIO-9073 and cRIO-9074 CompactRIO Controllers
http://digital.ni.com/public.nsf/allkb/37C790309A210A748625757000570938?OpenDocument
Sincerely,
Mauro Vera.

Can the number of ethernet ports be increased from 3?

Clearly I know that we cant weld another port onto the airport extreme but, I have 5 devices I need to run through the wireless network and the box only has 3. Is there any way to increase this number with perhaps a splitter or some add on device? All 5 will never be active at the same time but, the thought of having to go behind the port daily and swap out cables is not an option. THX

Will the ports enabled by this product also be capable of "n" speeds if I purchase the new N router?
Sounds like you got wireless and wired a bit mixed up. The Ethernet (wired) ports on the AirPort Extreme Base Station (AEBS) are rated at 10/100 Mbps. The AEBS's wireless is 802.11a/b/g/(pre-n)-compliant...meaning that theoretically it can handle speeds from 11 Mbps to 540 Mbps.
Adding an Ethernet switch to one of the AEBS's 10/100 Mbps Ethernet ports, will only provide 10/100 Mbps throughput, not 802.11n speeds.
Anything that is a little more aesthetically pleasing than that big blue box? Anyone else make such a device?
Linksys has several other models, as well as, Belkin, D-Link, & Netgear (to name a few).

Is the Airport express Ethernet port input only?

I am thinking of the airport express to stream audio now that the iPad supports airplay, but am wondering if the ethernet port is useful. I think that the Airport can connect to my existing wifi, and I have the audio interface, so far so good! But I also have a gaming adapter that takes the wifi signal and outputs it through an ethernet cable to my DVR, I am wondering if I can redeploy the gaming adapter

If you configure current model the AirPort Express to "join" a wireless network for AirTunes/AirPlay, you can also enable the ethernet port if you wish so an ethernet device can connect. If you need more than one ethernet port for devices, you can attach an ethernet switch to the Express.

What's the best Gigabit Ethernet ADSL2 modem to use with the new Apple Extreme router?

I Have upgraded to the new Apple Airport Extreme & need to update my old ADSL modem as it only has 10/100 ethernet. I don't want to spend a great deal as I will hopefully be upgrading to fibre later in the year. I find it strange that Apple have never sold them through the Apple Store.
Thanks in advance.

It would make no sense to recommend a modem that your Internet Service Provider (ISP) does not support, so your first task is to contact your ISP for a list of "approved" modems for use with their service.
Once we have the list, it will be easy to eliminate the non-Gigabit models, since most, if not all, will be not be Gigabit rated.
After all, the fastest speed that any ADSL provider might be able to deliver is maybe 30-40 Mbps. Don't think that you will need 1,000 Mbps capability in a modem for that type of connection.
Kind of like having a car that can go 1,000 miles per hour, but the streets are narrow, crooked, and won't allow much over 25 miles per hour.

Is there a difference between the Ethernet WAN port and the other 3 Ethernet Ports on a Time Capsule?

As posted previously, my time capsule will not set up properly because I get an IP address conflict pop up window. Is there a difference between the "Ethernet WAN Port" and the other three ports on the back of the Time Capsule? I may have the DSL modem hooked into the "Ethernet WAN Port". Thanks.

it depends what you want to achieve and what configuration you have on your DSL modem/router.
Resetting TC and run connection wizard from the Airport utility.
Post the problems.

Why can't I access the internet via ethernet port on my Airport Express?

I have an Airport Extreme base station and two Airport Express units. The Extreme is connected by ethernet to a BT Home Hub (BT is the internet provider). The network works for all the other computers that have Airport cards BUT I want to connect a Mac Mini (no airport card) by ethernet to the Express, but no matter how I try re-jigging the settings on the base station and Express, it won't connect. Mac Mini WILL connect when wired directly to the Extreme base station, so it's not the port. Also, I have been able to stream iTunes to the Express units so they are functioning in that respect. What am I doing wrong or not doing? Do I need to set up a WDS? Is there a bridging mode? Do I need to have a relay? Surely internet via the Express is possible!

The Airport Express units are the A1088 variety. The Extreme is A1354. Originally I set up the base station to create a network and got the Expresses to 'join network'. However, since that didn't work, I dug a little deeper and investigated WDS and bridge settings. The base station wireless mode is 'Create a network'. I selected 'allow this network to be extended' and made sure that the channel used was the same as the Express units. I have set up one Express to be a WDS remote and one to be a WDS relay on the same channel of the same network with the same password. I have specified the MAC address of the base as the main and the other MAC addresses in the appropriate places for the Expresses. I have tried selecting the 802.11b/g radio mode manually as well as in automatic. Access control is off for all units. I have tried the base station connection setting on 'Off (bridge mode)' and 'share a public IP address'. Am I just missing something?

Is it possible to use the built-in Ethernet port in the RE1000 to Minimize Decreasing throughput

Kindly
Is it possible to use the built-in Fast Ethernet (10/100 Mbps) port to extend the network with an Ethernet cable without placing the extender in an area where you still have at signal ?
because i dont want to decrease the wireless through-put by 50 % .
I would like to Expand the network network by running an Ethernet cable from an RE4200(Basement floor ) router to the end of the RE1000 built-in Fast Ethernet (10/100 Mbps) port in the second floor..

The Linksys RE1000 Wireless-N Range Extender includes a built-in Fast Ethernet (10/100 Mbps) port, which works as a wireless bridge to instantly connect any wired Ethernet device to your network. To ensure the proper configuration of the range extender, you need to know the wireless settings of your router or access point. These settings are:
• SSID
• Wireless Channel
• Wireless Security and Network Key
Here is the link for manually configuring a range extender: http://www6.nohold.net/Cisco2/ukp.aspx?vw=1&docid=206954591ff54e36884bb4636fcfd3d9_Manually_configur...
Once your range extender gets sync with your router you can make the RE1000 as a Bridge...

The three gigabit ethernet ports:

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