10BASE-T V/S 100BASE-T

If my Cisco 831 is only capable of 10BASE-T for a WAN connection to a corporate VPN server and there re 12 people on this VPN through a 8MBPS cable modem, can this be the bottleneck and reason why our connection is so slow?

An 831 does simply not have the processor power to drive an 8Mb VPN. You should use an 1841 or better instead.
Regards,
Leo

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PowerBook - Powerbook 17 LCD, Inverter and Video LCD Cable

Hi,
I have the following issue:
My Video LCD Cable is broken (Some of the little cables inside are broken) and i need to replace it. But i'm not sure if the Inverter is also broken. Is there a way to know that so i can buy both of them or only the LCD Cable?
If i only connect the inverter to the LCD, should there be a blank white screen at least?
How do i know I only need to buy those two parts (Inverter and LCD Cable) and it's not also my video card in the logic board that got burned? Can the Video card in the logic board get burned or broken?
When i turn on the computer, i get no video at all, no blank white screen or anything. I know it boots and loads the OS since i get some sounds at boot.
Thanks for any tips i received!
The Powerbook is a 17" 1.67MHZ.

Hi Magpie,
Well that changed with the iMac G5. Here's a quote from this Apple document...
Ethernet port (10/100 Base-T)
The iMac G5 has a built-in 10/100 Mbit/s Ethernet port. The iMac G5 computer can be connected to an Ethernet cable from a cable or DSL modem, hub, switch, or router, or to another Macintosh computer. The connected device can be either a 10Base-T or a 100Base-TX device; the port automatically detects which type of device is connected. You don't have to use an Ethernet crossover cable to connect to other Ethernet devices.
http://docs.info.apple.com/article.html?artnum=86813
I'm guessing that up to the iMac G4s you had to use a crossover cable. I just tried a crossover from my G4 tower to a Window's XP box and it worked just fine.

How can I make the 10/100BASE-T Ethernet port on my Airport Express work as a LAN-port? The AE is currently extending my network (generated by a Time Capsule)

Dear all.
I currently have a WIFI-network established by a Time Capsule. I want to use my Airport Express as WIFI-receiver for my Samsung TV. How do I pair them up so that the 10/100BASE-T ethernet port works as a LAN-port? I used to do it by setting it up as WDS but I understand this is not suitable for a "n" network.
Thx.

Under the wireless settings for the TIme Capsule, make sure that there is a check mark next to "Allow this network to be extended"
Then configure the AirPort Express to "Extend a wireless network". The Ethernet port on the Express is automatically enabled in this type of configuration and the AirPort Express will also provide more wireless coverage in the area where it is located.
See Apple's instructions in the link below. The iilustration shown in the support document shows an AirPort Extreme as the extending device, but the setup for the AirPort Express would be exactly the same
http://support.apple.com/kb/HT4259

Unable to connect to LAN - Integrated 10/100BASE-T Ethernet LAN (RJ-45 connector)

Unable to connect to LAN, downgraded laptop from Windows 8 to Windows 7 64-bit. Have tried using the HP device identifier, and installing all drivers under Network for the laptop on WIndows 7, though none of them showed as being for Local Area Network.I also tried following this thread: http://h30434.www3.hp.com/t5/Wireless-Internet-Home-Networking/Integrated-10-100BASE-T-Ethernet-LAN-RJ-45-connector/td-p/4040756Downloaded the suggested drivers there for the HP Envy 17t-j100I also tested downloading the drivers here for Windows 7: http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=14&PFid=7&Level=5&Conn=4&DownTypeID=3&GetDown=false Neither worked, I am still only able to connect via Wi-Fi, but not via LAN with actual cable attached.In case necessary, hardware ID for the Realtek PCIe FE Family Controller:
PCI\VEN_10EC&DEV_8136&SUBSYS_1854103C&REV_05PCI\VEN_10EC&DEV_8136&SUBSYS_1854103CPCI\VEN_10EC&DEV_8136&CC_020000PCI\VEN_10EC&DEV_8136&CC_0200

Hi: You can use all of the W7 x64 drivers and software from the HP 2000t-2a00 on your model except the BIOS and firmware files. Make sure you install the Intel chipset installation utility first and reboot before trying to install the Realtek LAN driver. http://h22207.www2.hp.com/us-en/drivers/selfservice/hp-2000-2a00-notebook-pc-series/5259212/model/5275371

1000BASE-LX compatible with 100BASE-LX

I have a optical network designed over singlemode fiber. All my communication modules are based on the standard 1000BASE-LX, which is the GLC-LH-SM SFP module. However, I would like to add to my network an external component rated at 1310 nm and 100 Mbps, which is the same wavelength but a lower speed. This external component is not available on a Gigabytes speed and I am stuck with this one.
Can I connect them together, or do I have to change my SFP module with one based on the 100BASE-LX standard, like the GLC-FE-100LX ?
Also, do you have some good references where I could easily get this kind of information ?
Thank you for your time.

A 100M optical interface with 30dB link budget would most likely be a 100Base-EX (extended reach). It could interoperate with an LX10 if the link is within the LX10s budget (<10km) and the optical receive power at the LX10 transceiver is within the receiver's posted operating range (min/max).
Many vendors have optical transceivers that reach outside the IEEE standards because they are typically bookended; the same product used at both ends of the link. When you mix vendors, it is good to keep with the standards based optics so that it is easy to engineer and maintain the links; especially as technicians come and go and the network documentation may not be maintained.

100BASE-BX10-U or GLC-FE-100LX-RGD ?

Hi all.
I have AIR-LAP1522 and I need to connect it via fiber. Documentation says, that on 1522 side I should use
100BASE-BX10-U module. As I know it is a module for 100-MB ports, 1310 nm TX/1550 nm RX wavelength, 10 km over single-strand SMF.
My question is, can I use GLC-FE-100LX-RGD (GLC-FE-100LX) instead 100BASE-BX10-U and use pair of SMF?
I have single mode FO.
And second question is, where is a diiference between GLC-FE-100LX-RGD and GLC-FE-100LX?
Best regards Marcin

The rugged (GLC-FE-100LX-RGD) transceiver should be comaptible as long as you have two strands (duplex fiber).
I wouldn't advise using the non-rugged transceiver (GLC-FE-100LX) as the difference is the rated operating temparature. It's
0 to 70°C (32 to 158°F) for the commercial, non-rugged transceivers and -40 to 85°C (-40 to 185°F) for the industrial (RGD) types. Reference the data sheet.

Low bandwidth anomalies at a university: 100BASE-TX and 1000BASE-T

+Please note that this question was originally posted in another thread. In the hope of resolving this issue as quickly as possible, I’ve reposted this question in this thread- to cast the largest net, so to speak.+
Over the past several weeks, colleagues and I have been attempting to resolve low bandwidth and throughput problems experienced by users at our university. The entirety of these instances are located in one building on campus. Working with one faculty member extensively, we initially saw problems including low download speeds, and in certain instances, exceedingly high upload speeds. At a first approximation, I concluded that this was the result of a duplex mismatch. Upon further investigation, and the inclusion of university IT personnel, we were informed that the problem was supposedly not related to a duplex mismatch, but rather a platform specific anomaly, specifically related to Macs and their supposed inability (or at the very least limited ability) to employ auto-negotiation protocols with any degree of success.
My colleagues and I dismissed this almost entirely as ignorance or prejudicial. Was this an error?
In order to test that hypothesis, we connected a PC to one of the drops in question; no substantial change in bandwidth was detected.
However, during one meeting, it was communicated to us that by switching from the extant 100BASE-TX connections to a Gigabit Ethernet (1000BASE-T) connection that any low bandwidth issues would be resolved. Having made the transition for two machines, we have been unable to verify that the expected improvement was made respective to the new standard. Under the 100BASE-TX connections, we observed a range of download rates as low as 10-20kb/s and as fast as 4-10 Mb/s. After the switch to Gigabit Ethernet, the maximum download rate we’ve seen has been 80Mb/s; the average rate is substantially lower, usually floating in a range of 10-18 Mb/s. In any event, these represent a staggeringly low fraction of the expected available bandwidth.
I’ve adjusted TCP buffer sizes (albeit with the Apple Broadband Tuner, not via the terminal), adjusted frame sizes (up to jumbo frames) and confirmed numerous times that the auto-negotiation protocols are indeed working client-side. On all the affected machines the speed (1000BASE-T) is set automatically, as are the duplex mode and MTU. Adjusting these settings manually seemingly has no effect.
The affected machines include two Mac Pro workstations (quad core 3GHz and a eight-core 2.8 GHz), a MacBook Pro (2.5 GHz, 15 inch) a dual processor G5 tower (liquid cooled 2.5 GHz model), a Dell PC (for testing purposes only- see above), and a 500 MHz G4. The problem persists in various drops in the building, seemingly randomly.
My suspicion is that the problem exists on the server-end; either a switch or router is configured incorrectly or perhaps a cabling problem exists? Unfortunately, the university’s IT personnel are not providing any answers. I’m wondering if I’ve overlooked something (basic or otherwise) that might be contributing to these problems?
Thanks in advance!
Message was edited by: DRS 1

DRS 1 wrote:
My colleagues and I dismissed this almost entirely as ignorance or prejudicial. Was this an error?
No.
In order to test that hypothesis, we connected a PC to one of the drops in question; no substantial change in bandwidth was detected.
What do you mean by "no change"? Does the PC run fast or slow like the Macs? If the PC runs slow, then you should be able to use that fact to get the network fixed.
My suspicion is that the problem exists on the server-end; either a switch or router is configured incorrectly or perhaps a cabling problem exists? Unfortunately, the university’s IT personnel are not providing any answers. I’m wondering if I’ve overlooked something (basic or otherwise) that might be contributing to these problems?
First, you need to clarify a couple of things. Does a PC work correctly in this building? Does a Mac from the building work correctly in another building. You can try going to some random office store and buying the absolute cheapest 100BT hub and plugging that into the network and plug the Macs into the new hub. How is the speed?
The problem is almost certainly wiring problems or a flaky router or hub. Unfortunately, no IT department in the world will even give you the time of day if "Macs" are involved. You have to prove that there is a problem that does not involve the Macs. For that, you'll need a PC or a hub. This is the one job that Mac can't do.

WS-X6748-SFP and 100Base-X

Hello.
Our network is based on Cisco7600 with WS-X6748-SFP modules.
As optical transceiver we use gigabitethernet GLC (1000Base-X).
In order to reduce costs can we use Fastethernet GLC 100Base-X?
Thx

Nope, that won't work. You need to use the 1000Base-X transceivers.
-brad
www.ccbootcamp.com
(please rate the post if this helps!)

SRW2008 with a 100Base-FX SFP?

i got a 100Base-FX SFP from my localloop provider and tried to use it in a Linksys SRW2008 switch.
it seems the SFP ports are fixed to 1000Base. is there a way around this limitation?
thanks for your help.

Hi
Check software requirements and configuration requirements in the attached guide.
I think it gives you your answer (I hope )
It suggests you need 1.0.3 software and then try the following;
Manually Configuring the 100M SFP
STEP 1 On the Port Configuration page, click Detail.
STEP 2 In the Port Configuration popup window, select eth 100M in the SFP Speed field.
STEP 3 Save your changes.
STEP 4 Insert the 100M SFP module.
Hope this helps
regards Dave

6509e SUP-2T VSS and 100BASE-X SFP

Dear All,
i need to connect via 100BASE-X uplinks some access switches to 6509e VSS distribution Switches having SUP-2T.
It seems that the only module on 6509e supporting 100BASE-X SFP is WS-X6148-FE-SFP. This module is going EoS and is not supportes in VSS.
Is there any other modules that i can use?
Thanks and Regards
Giuseppe

Hi,
Here's a link that contains information about available line cards that might help you:
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_data_sheet0900aecd801459a7.html
Regards,

HP J4853A and Cisco SFP Module 100BASE-FX

Hello Everyone!
Will HP J4853A and Cisco SFP Module 100BASE-FX modules be compatible?
Thank you!

This is the output from sh interface:
GigabitEthernet0/1 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is f029.2950.8119 (bia f029.2950.8119)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Auto-duplex, Auto-speed, link type is auto, media type is 1000BaseLX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
    0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
As you can see the switch detects SFP as 1000BaseLX SFP, however it is 100Base FX

SFP 100BASE-LX/EX on Catalyst 6500

Hello everybody,
I have to connect some switches working on fiber optic with 100BASE-LX and 100BASE-EX to our 6500s.
I had a look at the Cisco SFP lists and found that the GLC-FE-100LX and GLC-FE-100EX should do what I need, but as far as I understood our 6500 modules are not compatible with them. We have only WS-6748-SFP, which seem to support only gigabit SFPs.
Looking at the compatibility matrices I found that the only module that can host those SFPs is the WS-X6148-FE-SFP. Probably this solution is expensive compared with the number of links we have to setup (about 10, and it's not foreseen to make more). Also, the LX and EX SFPs need to have IOS 12.2(18)SXF and 12.2(18)SXF3, respectively, and we have 12.2(18)SXD7a, so an IOS update would also be necessary.
In the end, I'm wondering if you have any suggestion/alternative solution to solve this situation, that is not buying a bunch of unmanaged mediaconverters... or maybe you convince me that it is worth to buy that module...
Another solution could be to buy a dedicated switch for these links, and maybe you have suggestions also for this!
Many thanks for your help!
Regards,
Adamo

Actually, that is not correct. All of the 48 port Gig-E line cards for the 6500 are oversubscribed; it does vary by the degree of oversubscription.
In a 6506 or a 6509 (with a Sup720) you have (2) 20 Gbps connections (per slot) to the fabric. With a WS-X6748-GE-TX you have a potential for 48 (Full Duplex) Gbps of traffic, but only 2 connections to the fabric. This yields an oversubscription rate of 1.2:1 (or 48:40) assuming a worst case scenario.
It should be noted that the 24 port 67xx cards are still oversubscribed as well, because they only have one connection to the fabric. There is a potential for 24 Gbps of traffic and only (1) 20 Gbps fabric connection, so it has an identical oversubscription rate.
By using only 24 of the 48 possible ports, depending on which ones you choose, you should be OK. But I do not know which ports use which fabric connection on the backplane, so I can't assist you in picking them.
It should be noted that in most environments it is unlikely every port will be a 100% utilized so the risk of dropping packets because of oversubscription is low.

100BASE-BX10 SFP

Hi All,
I have several Cisco 3560C setup at multiple stations. The Cisco 3560C are connected in a daisy chain between each other using 100BASE-BX10-D and 100BASE-BX10-U SFP. So, on the first Cisco 3560C (station 1), I have a U-type connecting to the second Cisco 3560C (station 2.). The second Cisco 3560C (station 2) will have a D-type and U-type SFP where the D-type connects to the previous station 1 on its U-type SFP. This setup repeats for station 3 onwards.
It seems that these connections between the stations, I noticed that the Cisco switch registers the link at 100Mb half-duplex and I see incrementing CRCs and collisions. I am not able to hard-code the interface to 100Mb FULL as it seems that the interface configuration does not give me the option to do a 'speed 100' or 'duplex full'.
Is this normal for these kinds of SFP?
Below are some outputs:
Cisco IOS Software, C3560C Software (C3560c405-UNIVERSALK9-M), Version 12.2(55)EX3, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Wed 10-Aug-11 07:37 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x02100000
Switch(config)#do sh int status
Port      Name               Status       Vlan       Duplex Speed Type
Fa0/1                        notconnect   15           auto   auto 10/100BaseTX
Fa0/2                        notconnect   15           auto   auto 10/100BaseTX
Fa0/3                        notconnect   15           auto   auto 10/100BaseTX
Fa0/4                        notconnect   15           auto   auto 10/100BaseTX
Fa0/5                        connected    15         a-full a-100 10/100BaseTX
Fa0/6                        notconnect   15           auto   auto 10/100BaseTX
Fa0/7                        notconnect   15           auto   auto 10/100BaseTX
Fa0/8                        notconnect   15           auto   auto 10/100BaseTX
Fa0/9                        notconnect   15           auto   auto 10/100BaseTX
Fa0/10                       notconnect   15           auto   auto 10/100BaseTX
Fa0/11                       connected    trunk      a-full a-100 10/100BaseTX
Fa0/12                       connected    trunk      a-full a-100 10/100BaseTX
Gi0/1                        connected    trunk      a-half a-100 100BaseBX-10U SFP
Gi0/2                        connected    trunk      a-half a-100 100BaseBX-10D SFP
Switch#sh interfaces gigabitEthernet 0/2
GigabitEthernet0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is c025.5c11.928d (bia c025.5c11.928d)
Description:
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 254/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Half-duplex, 100Mb/s, link type is auto, media type is 100BaseBX-10D SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 80000 bits/sec, 22 packets/sec
5 minute output rate 16000 bits/sec, 16 packets/sec
     74931 packets input, 21611558 bytes, 0 no buffer
     Received 48734 broadcasts (39982 multicasts)
     0 runts, 0 giants, 0 throttles
     667 input errors, 667 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 39982 multicast, 0 pause input
     0 input packets with dribble condition detected
     23385 packets output, 3857612 bytes, 0 underruns
     0 output errors, 564 collisions, 1 interface resets
     0 babbles, 29 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

Yes scope all connections with a 900 micron 200x scope, and clean anything you can.
GLC-FE-100BX-U
100BASE-BX10-U
-8
-14
-3
-28.2
GLC-FE-100BX-D
100BASE-BX10-D
-8
-14
-3
-28.2
If its clean, check the TX/RX power levels with a power meters. End-to-end; bidirectional test, on both lamdas.
Because of the CWDM going on, I'm not sure I'd trust the internal "show hard" or
"show interfaces interface-id transceiver detail" internaly.
Obviously this is something common/systemic since it happens betwen multiple locations.
Is the fiber the common denominator?

1000BASE-SX to 100BASE-FX connection

I want to uplink a new switch (Catalyst 3560 24 10/100 PoE + 2 SFP Standard Image)to an old switch which is 100BASE-FX using a MM fibre. Hence this is an issue of connecting a 1000BASE-SX port to a 100BASE-FX port using MM fibre. Can the connection work?

As the others have said, you can't connect 1000BASE-SX directly to 100BASE-FX.
If you want to connect to the old switch using 100BASE-FX, your best bet is to use a 100BASE-TX to 100BASE-FX Fast Ethernet media converter to adapt one of your 10/100 switch ports to the fiber. The copper side of the media converter plugs into one of your 24 10/100 switch ports, the fiber side plugs into the multimode fiber to your old switch. You will need an extra electrical outlet for the media converter's power pack, as it is an active networking component (needs power to work).
There are many manufacturers of Fast Ethenet TX-to-SX media converters out there. Personally, I recommend Transition Networks equipment, I've had good experiences with them. Their web site is:
http://www.transition.com
If you decide to use a media converter, be sure to specify the optical side to be multimode, not single mode; the wavelength should be 1300nm for 100Base-FX (there are some short-haul versions that use 850nm, you probably want to avoid these); and match the optical connectors to the type of fiber patch cable you already have (SC is most common for 100FX, but you may have ST, or even LC or MT-RJ).

Apple Airport Express Base Station 10/100BASE-T Ethernet WAN port with AirT

Hello fellow mac users, I am currently interested in getting the Apple Airport Express Base Station 10/100BASE-T Ethernet WAN port with AirTunes. However I already have a Linksys Wireless G with SpeedBooster router. Will the Airport Express with iTunes work with my router? Or will it work with any router? Thanks!
P.S. I want to get the Apple Airport Express Base Station 10/100BASE-T Ethernet WAN port with AirTunes
Powerbook G4 Mac OS X (10.4.5)

Yes, it should be possible. Since your iMac is connected via Ethernet to another router, you would have to reconfigure which Network Service you will be using on the iMac to switch between streaming and connecting to the Internet.
For example, I am assuming that the Built-in Ethernet service is currently at the top of the Port Configurations 0list within System Preferences > Network > Show = Network Port Configurations when your iMac is connected to the other router by Ethernet. You would then need to drag the AirPort item to the top of the list, and then, connect to the AirPort Express to stream.
The other option to avoid this is to configure the AirPort Express to join the wireless network created by the 2Wire router.

10BASE-T V/S 100BASE-T

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