Gigabit ethernet only supports 100Mb

Hi
Im having a problem with the 48-port Gigabit ethernet blade (48-port 10/100/1000BaseT (RJ45)) on a 4506 switch, one of the ports only support 100Mb, if hardcoded to 1000Mb on both sides, then the connectivity would be gone. All other ports on this blade seem fine.
Would it be a hardware issue? Any idea what caused it?
Thank you
Jane

Not at this point, no.
Any diagnostics, with or without testing equipment, are going to require disconnecting either or both ends of the cable.
You can follow the cable through the system and inspect all of the connections (patch cable->panel->info outlet->patch cable to the host), maybe try re-punching the connection at the panel to make sure the wires are seated into the IDC connector.
You'd be looking primarily at the blue and brown pairs (green and orange are used for Ethernet/Fast Ethernet).
Likely as not, one of the blue or brown pair are reversed (i.e., white-blue and blue are swapped at the panel).
If that's the case, you'll need to clear and re-punch the pair.
Good Luck
Scott

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G4 (gigabit ethernet) hard drive question

so i am turning an old g4 450 mhz of mine into a file server with old hard drives of mine laying around. i put in 2 of my 250gb hard drives in where the zip drive and cd drive were giving myself a total of 4 hard dries my only problem is when i start up my computer says it cant read the hard drives and in disc utility it reads them as 128gb drives. is the g4 too old to read drives bigger then 150gb? oh yeah and the drives are all IDE
Message was edited by: dblester

Hi-
The Gigabit Ethernet only supports drives up to 137GB, or 128GB formatted.
You can use larger drives, but the portion beyond the 128GB will not be used.
Alternatives are, either an ATA PCI controller card like that from Acard, or, using a software patch, with special partitioning.
Check Speedtools HiCap Driver.

Airport Extreme with Gigabit Ethernet - Does it have jumbo frame support?

Please, can I get definite answer to this question? I do not need speculations as I read some reviews already. Can we have Apple finally put complete specification of the product rather than "popular one" with attachement of protocol numbers?
I just need simple answer possibly from Apple engineering team to the following questions:
1. Does current Airport Extreme have support for jumbo frames (everything above 1500bytes per frame)? (if one does not know what that is them perhaps understanding acronym "MTU" can help a bit)
2. If there is support then what is the maximum supported size of jumbo frame? (Some products do not go above 6k and I read some statistics that traffic somwhere is usually 66% at about 4k jumbo frames and above that there is not much...)
3. If there is no support then does Apple plan on update for this (firmware or hardware) in the future?
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I just need reliable answer by product specification that should be on paper at Apple, but it is not so I hope that one of guys here has access to some engineering team.
Thank you,
Maciek Samsel

The spec. on the chip used by Apple support your conclusion.
BCM5395 Features
Complies with IEEE802.3, IEEE802.3u, IEEE802.3ab standards
5 10/100/1000Mbps Auto-Sense RJ45 ports supporting Auto-MDI/MDIX
All ports Support Full/Half Duplex transfer mode for 10/100Mbps and Full Duplex transfer mode for 1000Mbps
Port-based and MAC-based VLAN
IEEE 802.1Q-based VLAN with 4K entries
Port-based rate control
Port mirroring
Compact field processor (CFP)
512 rules
Filtering, classifications, remarking, and priority actions.
Priority modification on egress
DOS Attack Prevention
Loop detection for unmanaged configurations with Broadcom’s patented LoopDTech™ technology
CableChecker™ with unmanaged mode support
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IEEE 802.3x programmable per-port flow control and back pressure, with IEEE 802.1x support for secure user authentication
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Imaging support for ax88179 (USB3.0-Gigabit Ethernet adapter

Hi
I anyone aware whether support for ax88179 (USB3.0-Gigabit Ethernet adapter) will be added in forthcoming ZCM patches/driver updates?
We are running 11.3.2 but are assessing these adapters for imaging a fleet of tablet/notbook machines we have arriving... The docks are only 10/100 and we need gigabit given the number we will have to deploy...!
Cheers
David

Review this TID as well....
https://www.novell.com/support/kb/doc.php?id=3421576
Development will need the results to add support.
You may be able to get it working yourself with the NEWID command in the short-term or you may need new drivers added.
Either way, it is best to open an SR but if you have that data in hand, it will speed the process.

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

Gigabit ethernet (tg3) problem

Hi all
i have this ethernet
Ethernet controller: Broadcom Corporation NetLink BCM5789 Gigabit Ethernet PCI Express (rev 21)
using tg3 driver but link is up to a speed of 100 as ethtool shows
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: d
Current message level: 0x000000ff (255)
Link detected: yes
I tried changing speed with ethtool but nothing happens
It is connected to a Gigabit switch wich operates perfectly (other computers on switch work in Gigabit speed)
Any ideas?

Kind of worked it out. I think that the port is 'mini display port' only and not Thnderbolt, doh. I now have a Mini Display port to VGA Adapter and a Thunderbolt to Gigabit Ethernet Adaptor which I cannot use. Since I bought them from an Apple shop with in store support I feel miffed. Thank you for your help gmalone1.

Gigabit ethernet + TC doesn't mean gigabit transfer rates to the TC drive..

Alright.... I've spent a ton of time trying to figure this out (probably more than I should have) and I thought I'd post my findings so that either a) I'll save someone else time out there or b) someone can tell me I'm a complete moron
So I had an airport extreme. I replaced it with a Time Capsule. I have a Windows (boooo) PC connecting directly to my TC using a gigabit ethernet card (which I bought specifically connect it to the TC) so (I thought) I could enjoy gigabit transfer speeds to the internal hard drive from the wired PC. I had some fun plans of shoving my itunes directory on the TC and letting appletv sync (yes through my pc) and keeping lots of videos there, etc. Who cares - it'd be at gigabit speeds! But, in reality, things didn't quite work that way (though my itunes directory does still live on my TC...for now).
Well, I had a semi-unique situation to do some pretty massive testing because I have 2 gigabit network cards, 1 100mb network card, and a wireless-n network card and two internal hard drives - both very fast. I also tried Cat 5, Cat 5e, and a Cat 6 cable.
And here's what I (think I) figured out:
The hard drive in TC can not achieve gigabit transfer speeds. Your transfer rates will be limited by the IO to the hard drive. In fact, it can't even come close.
Using my "fastest" setup - so Cat 6, fastest internal drive, gigabit ethernet, and transferring a file exactly 1 gig in size I was able to have a sustained transfer rate of 140 megabit per second - that's 17.4 MB/s for folks not wanting to do the math (that's reading FROM the TC. Writing TO the TC dropped the speed down to 106 megabit/second or 13.35 MB/s). Going to a 5e cable knocked that down to 130 megabit a second. Putting in a Cat 5 cable knocked me down to 110 megabit a second. Switching between my two gigabit network cards did nothing. Switching my cards between two computers did nothing.
Now, just changing the above setup to use my 100Mb network card resulted in these results: 67 megabit read (8.4MB/s) and 65 megabit write (8MB/s)...
And using wireless N, I got about 10MB/s up and down.
And just as a final test, connecting my two computers together using the 2 gigabit network cards through the TC, I was able to achieve standard gigabit speeds.
SO what does this all mean?
I think the IO to the hard drive in the TC can only read at about 140 megabit/s and write at about 110 megabit/s. I'm not sure if it's the HD itself or how it's connecting to the TC - but that's why I'm not aware of anyone getting faster transfer rates to the drive in the TC (maybe you guys are?). The gigabit ports themselves are fine - and if you're doing anything from one gigabit port to another gigabit port you'll be fine.
So stop beating yourself up trying to find some elusive XP specific issue with gigabit transfer rates (though vista had a problem - shocker), or that you must have a defective gigabit card (which is why I have two cards now instead of one :)), or that your cable must be bad ("maybe my cat 5e isn't good enough?")... it's just this drive ... or how the drive is connecting to the network - can't handle the gigabit speeds.
Unless someone else out there has another explanation? Do these speeds mesh with what you're seeing in "optimal" situations? Or maybe there's just a throttle switch for goobers like me using Windows instead of MacOS!

Hi,
the interfaces available today which connect your drives integrated electronics to your computer can handle that speeds. but the drive itself is limited by the mechanical things going on in there
You can get such transfer speeds if the data you request is in the cache of the drives internal electronics for example. Some drives have 8 MB of cache memory. So if you request to read or write less than 8 mb and (in the read case) you are lucky enough to have those few megabytes cached then you may get that performance
Regards,
somi

Mac Mini Server Link aggregation - Thunderbolt or USB 3 gigabit ethernet adaptors

I am setting up a late 2012 Mac Mini as a file server with Server 2.2. It has a Promise Pegasus R4 RAID and LaCie 4TB drives daisy chained via the Thunderbolt connection. 4 users on MacPro's will connect to the server to access these hard drives via gigabit ethernet.
I imagine the gigabit ethernet will be the bottleneck, so I'm now looking at link aggregation. Not a problem on the MacPro's but the Mac Mini will require an adaptor to get a second gigabit port. From reading this forum I understand the Apple Thunderbolt to Gigabit adaptor will work, but I'm concerned that it will need to be fitted 3rd in line after the R4 and LaCie drives. The 10Gbps bandwidth Thunderbolt has, may cause another bottleneck with all three working off the same port?
An option would be to use one of the USB 3 ports with this adaptor http://www.ebuyer.com/412005-startec...edium=products
I believe it work with OSX, but I have no speed information or if OSX link aggregation will work using it.
Any thoughts on the above would be appreciated and recommendations on a suitable Network Switch with LACP support welcome.

At present Mountain Lion Server cannot use a LACP bond, in my experience only of course. http://www.small-tree.com/kb_results.asp?ID=59 describes LACP/Bonds do not show up in Server Admin GUI on Mountain Lion
anyone know how to do it? or the location and the name of the plist file to configure the network interface in ML server?
regards

Thunderbolt Gigabit ethernet adapter is recognized - but no internet connection

Hello.
I just got a new macbook air. I need to connect it to the internet via ethernet cable - thus i purchased the Thunderbolt gigabit ethernet adapter, plugged it in - and nothing happened.
The cable is being recognized, in the networks section it shows the IP-address etc. and the little dot next to "ethernet thunderbolt" is green. but when I open safari, there is no internet connection.
Why is this? I have updated all available software. I also tried downloading the Thunderbolt Firmware Update (1.2.1) but I'm told it is not supported (i.e. it isn't installed).
Who can help me? I'm quite puzzled and don't seem to be able to find this same problem anywhere on the net.
Thanks for your help
enel

Is that quite lousy and am I a fool? ;-) I have turned it off. It didn't do the trick, I had already tried that numerous times.
BUT this time I also switched off the DSLmodem (an idea I hadn't had up until now, strangely enough - I had it only now while actually counting to 15) and then I ran the assistant again and the network was then finally being recognized for the first time.
Then I had to once more turn the router off and finally all the little status buttons turned green.
Yeah!
Thanks a lot for your help and your readiness to help! I really appreciate it.

Registering thunderbolt to gigabit ethernet adapter MAC-adress in the company LAN

Dear community,
I have a technical question regarding the thunderbolt to gigabit ethernet adapter!
In our company the current situation is to register the MAC-Address of every ethernet port which wants to join the local area network...so far so "normal"
The fact that the Apple notebooks have no longer an built-in ethernet port makes it complicated regarding security standards!
Is it correct that when I register the MAC-Address of an ethernet adapter to our company LAN I'm free to plugin every MacBook via Thunderbolt afterwards? There's is no "connection" between the adapter and a certain MacBook?
That doesn't sound very secure...
Can someone answer my question or does anyone have the same problem and found a workaround?
Thanks in advance,
Dennis

chaicka wrote:
In OS X Yosemite, is there option to enable 802.3ad (aka LACP) to bond the interfaces?
Or is it only achievable via command line configuration?
Yes it is exactly the same process as Mavericks (and earlier). You open System Preferences, click on Network, then at the bottom click on the small gear symbol (unlock the padlock first if needed), and then select Manage Virtual Interfaces. You then add a new Link Aggregate interface which will be your bonded network interfaces.
LACP is the only type of bonding Apple support.

How do I maximize LAN speeds using Gigabit Ethernet, jumbo frames?

I move a lot of large files (RAW photos, music and video) around my internal network, and I'm trying to squeeze out the fastest transfer speeds possible. My question has to do both with decisions about hardware and what settings to use once it's all hooked up.
This is what I have so far:
-- imac 3.06GHz, macbook pro 2.53GHz
-- Cisco gigabit smart switch capable of jumbo frames
-- Buffalo Terastation Duo NAS (network attached storage), also capable of Gbit and jumbo frames
-- All wired up with either cat6 or cat53e.
-- The sizes of the files I'm moving would include large #s of files at either 15MB (photos), 7MB (music), 1-2GB (video) and 650MB (also video).
-- jumbo frames have been enabled in the settings of the macs, the switch and the buffalo HD.
-- I've played with various settings of simultaneous connections (more of a help with smaller files), no real difference
-- Network utility shows the ethernet set to Gbit, with no errors or collisions.
-- have tried both ftp and the finder's drap and drop
-- also, whenever I'm doing a major move of data, I kick my family off the network, so there is no other traffic that should be interfering.
Even with all that, I'm still lucky to get transfer speeds at 15-20mbps, but more commonly at around 10. The other odd thing I've encountered while trying to up my speeds, is that I might start out a transfer at maybe 60mbps, it will maintain that for about 30-60sec and then it appears to ramp itself down, sometimes to as low as 1-5mbps. I'm starting to think my network is mocking me
I also have a dual band (2.4/5) wireless n router (not jumbo frame capable), but I'm assuming wired is going to trump wireless? (NOTE: in my tests, I have disabled wireless to force the connection through the ethernet).
Can anyone help with suggestions, and/or suggest a strong networking reference book with emphasis on mac? I'm willing to invest in additional equipment within reason.
Thanks in advance!
juliana

I'm going to pick and choose to answer just a few of the items you have listed. Hopefully others will address other items.
• This setup was getting me speeds as high as 10-15MB/sec, and as low as 5-6MB/sec when I was transferring video files around 1-2 GB in size
I would think a single large file would get the best sustained transfer rates, as you have less create new file overhead on the destination device. It is disturbing that the large files transfer at a slower rate.
• Would a RAID0 config get me faster write speeds than RAID1? I have another NAS that can do other RAID configs, which is fastest as far as write times?
RAID0 (Striped) is generally faster, as the I/O is spread across 2 disks.
RAID1 is mirrored, so you can not free the buffer until the same data is on BOTH disks. The disks are NOT going to be in rotational sync, so at least one of the disks will have to wait longer for the write sectors to move under the write heads.
But RAID1 gives you redundency. RAID0 has not redundency. And you can NOT switch back and forth between the 2 without reformatting your disks, so if you choose RAID0, you do not get redundency unless you provide your own via a backup device for your NAS.
• what is the most efficient transfer protocol? ftp? smb? something else? And am I better off invoking the protocol from the terminal, or is the overhead of an app-based client negligible?
Test the different transfers using a large file (100's of MB or a GB sized file would be good as a test file).
I've had good file transfers with AFP file sharing, but not knowing anything about your NAS, I do not know if it supports AFP, and if it does, whether it is a good implementation.
If your NAS supports ssh, then I would try scp instead of ftp. scp is like using cp only it works over the network.
If your NAS support rsync, that would be even better, as it has the ability to just copy files that are either NOT on the destination or update files which have changed, but leave the matching files alone.
This would help in situations where you cannot copy everything all at once.
But no matter what you choose, you should measure your performance so you choose something that is good enough.
• If a client is fine, does anyone have a suggestion as to best one for speed? Doesn't have to be free -- I don't mind supporting good software.
Again just test what you have.
• Whats a good number to allow for simultaneous connections, given the number of files and their size?
If the bottleneck is the NAS, then adding more I/O that will force the disk heads to move away from the current file being written will just slow things down.
But try 2 connections and measure your performance. If it gets better, then maybe the NAS is not the bottleneck.
• What question am I not asking?
You should try using another system as a test destination device in the network setup to see if it gets better, worse, or the same throughput as the NAS. You need to see about changing things in your setup to isolate where the problem might be.
Also do not rule out bad ethernet cables, so switch them out as well. For example, there was a time I tried to use Gigabit ethernet, but could only get 100BaseT. I even purchased a new gigabit switch, thinking the 1st was just not up to the task. It turned out I had a cheap ethernet cable that only had 4 wires instead of 8 and was not capable of gigabit speeds. An ethernet cable that has a broken wire or connector could exhibit similar performance issues.
So change anything and everything in your setup, one item at a time and use the same test so you have a pear to pear comparision.

Gigabit NIC reverts to 100mbs after suspend/resume

My motherboard has an integrated Realtek Gigabit ethernet controller, using the r8169 driver. See lspci output below.
It works fine, except after a suspend-resume cycle, it reverts to 100Mb/s rather than 1000Mb/s. It still works in 100mbs mode, just significantly slower. I can manually fix it back to GigE via "ethtool -s eth0 speed 1000". But I'd prefer to not have to do this.
Is there somewhere I should hard-code the ethtool settings, or should I modify a resume pm script? Or is there another solution?
Thanks!
Matt
ethtool output after suspend/resume:
ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
Link detected: yes
lspsi output:
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
Subsystem: Giga-byte Technology GA-EP45-DS5 Motherboard
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 45
Region 0: I/O ports at d000 [size=256]
Region 2: Memory at e9110000 (64-bit, prefetchable) [size=4K]
Region 4: Memory at e9100000 (64-bit, prefetchable) [size=64K]
[virtual] Expansion ROM at e9120000 [disabled] [size=64K]
Capabilities: <access denied>
Kernel driver in use: r8169
Kernel modules: r8169

Hi Matt,
same problem here. I've had this for several months now. Usually I don't even notice, because I don't transfer large files all that regularly.
A quick look on the kernel.org bug tracker turned this up: https://bugzilla.kernel.org/show_bug.cgi?id=10130 Seems like this is a fairly old issue.
ethtool gives me the exact same output as you've posted. I'm using the same chip and driver, but different motherboard:
# lspci -s 02:00.0 -v
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
Subsystem: ASUSTeK Computer Inc. Device 82c6
Flags: bus master, fast devsel, latency 0, IRQ 42
I/O ports at e800 [size=256]
Memory at fbfff000 (64-bit, non-prefetchable) [size=4K]
Memory at faff0000 (64-bit, prefetchable) [size=64K]
Expansion ROM at fbfc0000 [disabled] [size=128K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [b0] MSI-X: Enable- Count=2 Masked-
Capabilities: [d0] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 00-00-00-00-ec-10-68-81
Kernel driver in use: r8169
Kernel modules: r8169

Dropping Gigabit Ethernet connection

Hello,
I found out a strange issue on my mac mini 2011 with Gigabit Ethernet port and what I see that it is works on automatic mode, in 100 mbit speed, but today I bought cisko 1 gbit switch and I still see in network utility 100 mbit. If I force the 1 gbit speed in seeting I will get error message like cable was unplugged.
Don't tell me that I have broken logic board. My varanty finished 2 months ago.
Thank you.

OK ****! - was I wrong...
After the above entry I packed up my MacBook, headed out to the Mac store and dropped it for repair; they had it overnight. "The Genius" called me to pick it up the next day. The answer:
There's nothing wrong with your MacBook. They copied files back and fourth between my MacBook and many other hosts on their network; it performed as expected.
I gave him a short history of the problem, and he said, "OOOOOooohhh, it's the Belkin." I brought my baby home, did a little research, found that others had a similar problem and found an acceptable fix. I ordered the new switches, a 5-port for my desk and an 8-port for the servers in the back room; incidentally, these items were inexpensive.
I swapped out the Belkin F4G0500 for the TrendNet TEG-S50g and everything started popping:
The MacBook received (and retained) a DHCP lease
Files copied between the Mac and other hosts at gigabit speeds
I should say the rest of my gear, 3 Linux Servers, a Linux Desktop/Laptop, and printer all made use of the Belkin at gigabit speeds (100MB file between Host A <--> Host B in 2 seconds), it was only the Mac that had trouble with the Belkins.
I split this evenly between Belkin and Apple as a responsibility to fix for we the buyers. It's 2012, we should have layer 3 (switching) sorted out by now. This was minor but pricey pain in the ***.
Troubleshooting Techniques:
Create Files of a Specific Size
You can use the "dd" (Unix) program to create files of a specific size. To test gigabit speeds, specific file sizes take the guessing out of the equation.
Open the Terminal (Utilities directory)
To create test files, enter both of the following lines (line one, then line two, giving each time to finish):
dd if=/dev/zero of=~/Desktop/output_100MB.dat bs=1M count=100   # Creates a 100MB file
dd if=/dev/zero of=~/Desktop/output_1GB.dat   bs=1M count=1000 # Creates a 1GB   file
The files created in Step 3 will now be on your desktop ready for transfer/testing.
Quit the Terminal.
File Transfer Calculator
This calculator will give you an approximation of what transfer times should be; at least it's close enough for me. There will be a little flux due to various (network) conditions, within 2-3 seconds it seems, but generally these estimations should hold.
For my problem, I wanted to test a 100MB & 1GB file transfer between 2 computers (both with Gigabit Network Cards) on the same switch.
EG: for the 2 files, I fill in the calculator:
100MB file: Size: 100; Size Lable: MB; Speed Lable: -none ; Select Speed by interface: Wired Lan Gigabit Ethernet --> click Calculate = estimated 2 seconds.
1GB file: Size: 1; Size Lable: GB; Speed Lable: -none ; Select Speed by interface: Wired Lan Gigabit Ethernet --> click Calculate = estimated 9 seconds.
Verify Gigabit Speeds on the Switch
The Trendnet ports will light up GREEN for each port that is functioning at gigabit (1000 Mbit/s) speeds; ports that are only running at Fast Ethernet speeds (100 Mbit/s) will light up AMBER. Transfers must occur between any 2 computers lit green on the switch.
When I copy the files to another (host) computer I see transfer times for:
The 100MB file is on the money: 100MB   50.0MB/s 00:02 seconds.
The 1GB file takes a little longer: 1000MB 47.6MB/s 00:21
Here we see approximately 50.0MB/s transfer times for both. The File Transfer Calc estimate was off by 12 seconds but I did notice that the transfer degraded slightly (in speed) the longer it persisted; even though that's true, the MB/s is similar.
If you have a similar setup as me (1 switch under your desk, and 1 in the server room), repeat the transfers to (hosts) computers in the back room with a green light on the switch. The transfers should be similar if not the same.
It's not perfect but it's a week later and I'm almost $200 down; it's close enough for jazz and better than what I had before. I'm tired of screwing with it.
Cheers all,
TT

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.

Thunderbolt Gigabit Ethernet Adapter doesn't work

Just plugged in a Thunderbolt Gigabit Ethernet Adapter into MacBook Pro 15" 2.7GHz i7, OS 10.7.4
It is recognized correctly by System Profiler, but not in System Preferences - the Adapter just isn't shown in Network.
What is still needed?
Thanks for Answers!
DoktorMac®, Bern, Switzerland

Got this update:
All Thunderbolt-equipped Mac computers support this adapter. This adapter requires OS X Lion v10.7.4 or later. Thunderbolt-equipped Macs released prior to June, 2012, require the installation of Thunderbolt Software Update 1.2.1 to use this adapter.

Gigabit ethernet only supports 100Mb

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