3750 switch and HP switch fiber connectivity issue

I have connected 2 Cisco 3750 switches "WS-C3750-48TS-S" with the LC to LC Duplex Single Mode fiber cable. Both the switches are communicating with each other.
As i have checked in the cisco document that GLC-SX-MM support only Multimode fiber cable. So i am surprised how does it support single mode fiber optic cable.
Can anyone tell me the reason for supporting single mode fiber optic cable?
But when i connect HP 4208 switch with the same Cisco 3750 the interface is showing up but the input packets are 0 and output packets are increasing on both ends.
I have checked the SFP's and fiber cable are compatible with HP.
Can anybody suggest me what can be the possible cause of this?
Regards,
Mukesh Kumar
Network Engineer
Spooster IT Services

I tried to troubleshoot this issue by using some show commands.
As i have checked that there are some specific commands to check SFP transreceiver as given below:
show hw-module subslot slot/subslottransceiver port idprom.
show interfaces {{[int_name] transceiver {[detail]} | {transceiver [module mod] | detail [module mod]}}
But these commands support only those transreceivers which support DOM. GLC-SX-MM doesn't support DOM.
Can anyone tell me that are there some troubleshoting commands to solve out the issue?
Regards,
Mukesh Kumar
Network Engineer
Spooster IT Services

Similar Messages

SG 300-28 28-Port Gigabit Managed Switch -Lan connectivity issues

Hello,
Our office lan running on 2 * SG 300-28 28-Port Gigabit Managed Switch.
PID VID:SRW2024-K9 V01
Firmware Version (Active Image):1.0.0.27
The users are seeing there connection to fileservers(mapped network drives) slowing down over the period.
We have to re-boot the offending switch to get the normal traffic back.
I have raised a ticket with cisco small business people and they said to upgrade the firmware to latest version.
But I am wondering why I need to upgrade this switch as the other switch which also brought at the same time with the same spec have no such issues.
Even if I decided to upgrade the firmware, they have recommended that I need to reset the switch to factory settings and try to put the previous configuration manually which is a worry for me.
I have logged on to the web console and I have found out, I can use TFTP or HTTP to backup the config,how do I use those services and what parameters i need to pass those to work, does using that functionality can rollback the switch to previous running configuration?
PS: Both the switch have connected together using a FC trunk with link aggregation eanbled.So how do I get all those settings back if I upgrade/rollback?
I just have to come up with some solution as it is affecting the business, so any help would be much appreciated.
Please see the attachment and let me know if any other info needed?
Thanks in advance,
Regards
Suji

Hi,
Please see the difference between the connected switches configuration.
Maybe the vlan 10 and 30 has been created wrongly.
Please see the config for both the switches and give me some advice/suggestions.
I really appreciate that.
                              Bad Switch Config
/* This is the config for the bad switch */
interface port-channel 1
flowcontrol auto
exit
interface port-channel 2
description netAppFiler1
exit
interface port-channel 3
description Switch
flowcontrol auto
exit
port jumbo-frame
vlan database
vlan 10,30
exit
interface ethernet g12
switchport trunk native vlan 10
exit
interface ethernet g24
switchport trunk native vlan 30
exit
interface vlan 10
name Private
exit
interface vlan 30
name "Private 2"
exit
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
voice vlan oui-table add 000fe2 H3C_Aolynk______________
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone___________
voice vlan oui-table add 00e075 Polycom/Veritel_phone___
voice vlan oui-table add 00e0bb 3Com_phone______________
port-channel load-balance layer-2-3
interface range ethernet g(25-26)
channel-group 2 mode on
exit
interface range ethernet g(27-28)
channel-group 3 mode on
exit
interface range ethernet g(27-28)
lacp timeout short
exit
interface range ethernet g(1-26)
lacp port-priority 2
exit
ip dhcp relay address 192.168.0.1
ip dhcp relay enable
ip dhcp information option
interface vlan 1
ip dhcp relay enable
exit
bonjour service enable csco-sb
bonjour service enable http
bonjour service enable https
bonjour service enable ssh
bonjour service enable telnet
hostname switchbad
line console
exec-timeout 0
exit
line ssh
exec-timeout 0
exit
line telnet
exec-timeout 0
exit
username admin password xxxxxxxxxxxxxxxxxxxxxxxxxx level 15 encrypted
no snmp-server enable
snmp-server location "Server Rack"
ip http exec-timeout 0
ip https exec-timeout 0
clock timezone 1
clock dhcp timezone
ip name-server 192.168.0.1 192.168.0.9
snmp-server set rlAutomaticClockSetFromPCEnabled rlAutomaticClockSetFromPCEnabled true
                         Good Switch Config
/* Good switch run config *
interface port-channel 1
description Switch
flowcontrol auto
exit
port jumbo-frame
lacp system-priority 2
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
voice vlan oui-table add 000fe2 H3C_Aolynk______________
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone___________
voice vlan oui-table add 00e075 Polycom/Veritel_phone___
voice vlan oui-table add 00e0bb 3Com_phone______________
port-channel load-balance layer-2-3
interface range ethernet g(27-28)
channel-group 1 mode on
exit
interface range ethernet g(27-28)
lacp timeout short
exit
interface range ethernet g(1-26)
lacp port-priority 2
exit
interface port-channel 1
switchport protected-port
exit
ip dhcp relay address 192.168.0.1
ip dhcp relay enable
ip dhcp information option
bonjour service enable csco-sb
bonjour service enable http
bonjour service enable https
bonjour service enable ssh
bonjour service enable telnet
hostname switchbaebf1
line console
exec-timeout 0
exit
line ssh
exec-timeout 0
exit
line telnet
exec-timeout 0
exit
aaa authentication enable Console local
aaa authentication enable SSH local
aaa authentication enable Telnet local
aaa authentication login Console local
aaa authentication login SSH local
aaa authentication login Telnet local
line telnet
login authentication Telnet
enable authentication Telnet
password xxxxxxxxxxxxxxxxx encrypted
exit
line ssh
login authentication SSH
enable authentication SSH
password xxxxxxxxxxxxxxx encrypted
exit
line console
login authentication Console
enable authentication Console
password xxxxxxxxxxxxxx encrypted
exit
username admin password xxxxxxxxxxxxxx level xy encrypted
ip ssh server
snmp-server location "Comms rack"
ip http exec-timeout 0
ip https server
ip https exec-timeout 0
clock summer-time recurring eu
sntp unicast client enable
sntp unicast client poll
sntp broadcast client enable
sntp server xx.yyy.zz.70 poll
sntp server zz.yyy.xx.201 poll
sntp server zz.yy.xxx.2 poll
sntp server xzz.xxx.xy.149 poll
clock dhcp timezone
ip name-server 192.168.0.1 192.168.0.9
ip telnet server
snmp-server set rlAutomaticClockSetFromPCEnabled rlAutomaticClockSetFromPCEnabled true
Regards
Smith

My iPad2(Wifi-16Gb) unable to connect to home wifi network after upgraded to iOS6. The said network is a remembered network and never face this connection issue before iOS6.

Forget and reconnect the netwrok doean't solve the problem.
Even Network Reset recommended in others iPad user in the forum can't help as well.
Please advice. Thanks.

Some things to try first:
1. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
2. Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
3. Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
4. Go into your router security settings and change from WEP to WPA with AES.
5. Renew IP Address: (especially if you are droping internet connection)
    •    Launch Settings app
    •    Tap on Wi-Fi
    •    Tap on the blue arrow of the Wi-Fi network that you connect to from the list
    •    In the window that opens, tap on the Renew Lease button
~~~~~~~~~~~~~~~~~~~~~~~~~
iOS 6 Wifi Problems/Fixes
Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
iOS 6 iPad 3 wi-fi "connection fix" for netgear router
http://www.youtube.com/watch?v=XsWS4ha-dn0
Apple's iOS 6 Wi-Fi problems
http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
~~~~~~~~~~~~~~~~~~~~~~~
Look at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
How to Fix: My iPad Won't Connect to WiFi
http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

WRT160n and Xbox 360 Internet connection issues

I just got this router and it is working fine in getting connection but me and my roommates are having issues with the NAT type when playing xbox. As far as i know, two are hooked into the LAN via ethernet cable and the other is using wireless. When playing we all experience different levels of NAT type, Strict, Moderate, and Open. Is there a way to set up the router so that the NAT will stay open for all of us at the same time. The only way to get that now is to unplug the router just as we want to get on and play.
War Eagle.
Frattleship

Who is your ISP...?
How many X-Box do you have...?
Have you open the ports on the router...?
Also check this link.

2960 switch fiber connection over 40km single strand SM fiber

Hello everyone,
We are having an issue with the connection in the subject. We just gost dark fiber for connecting 2 2960 switches with single strand single mode fiber over more than 10Km.
Looking at the compatibility matrix and the SFP gigabit applications the 1000BASE-BX10 is the best I could find but cannot reach more than 10Km.
Can anyone please propose a solution? If media converters are the only way to go can please sugest manufacturer/model (even with SC connector) since Cisco does not make Media converters.
Thank you
Mario

A 40 km link is usually run using 1550nm wavelength due to lower light loss on the fiber at this wavelength. The 1000BaseEX module is spec'd to 40km and runs at 1310 nm wavelength, but you will lose light through a WDM filter (which is integrated in the single fiber SFP) which would reduce the link's length. I would check with some of the 3rd party media converter manufactures to see if any of them have a lower cost solution that operates over a single fiber at >40km.
Sorry... a link loss budget is the sum of:
Fiber cable loss + fiber connector losses + fiber splice losses + impairment losses (dispersion or PMD) + aging losses (safety margin).
If the transceiver's Loss Budget is greater than the Link Loss Budget, then the link should operate.
www.thefoa.org has some good videos for understanding fiber terminology at an easy to understand level.

Cisco ISE & 3750 Switch MAB configuration Issue

Hi,
I am writting in response to MAB issue which I noticed a few days ago and I am still not able to undestand what exactly happend. First of all I would like to say that I configured MAB authentication and according to the MAC the ISE configure a VLAN. All worked well: the test computer can change VLAN based on its MAC. The problem appear when I cut the connection to ISE server. Accourding to configuration the switch authorize the new device to VLAN 11 (critical VLAN) That is fine ! When the ISE server is up again I had a configuration which should reauthorize all ports assign in critical VLAN. But why that is not happend ??? It looks as the switch didn't notice that the RADIUS (ISE) was up and working again.
Here is the test switch configuration :
interface FastEthernet0/22
switchport access vlan 10
switchport mode access
authentication event fail action next-method
authentication event server dead action authorize vlan 11
authentication event server alive action reinitialize
authentication order mab dot1x
authentication priority mab dot1x
authentication port-control auto
authentication periodic
authentication violation restrict
mab
dot1x pae authenticator
spanning-tree portfast
spanning-tree bpduguard enable
snmp-server community ISE-Test RO
snmp-server community ISE-Test1 RW
snmp-server trap-source FastEthernet0/24
radius-server attribute 6 on-for-login-auth
radius-server attribute 8 include-in-access-req
radius-server attribute 25 access-request include
radius-server dead-criteria time 5 tries 3
radius-server host 192.168.98.10 auth-port 1812 acct-port 1813 key cisco123
radius-server vsa send accounting
radius-server vsa send authentication
Thank you in advanced! I hope that this issue might be intersting!
Martin

Can you confirm that you have the following syntax in your NAD:
aaa server radius dynamic-author
client 192.168.98.10 server-key AAA_Secret
Also, it would be nice to have the complete aaa/radius config. If esear post your whole config here.
Last but not the elast, you can try moving to 15.x code. I had issues in the past with 12.x code and 802.1x

You View and Sony Bravia HDMI connection issues

For what it is worth I though I would post a solution that has worked which solved compatability issues between some Sony Bravia TV's and YouView boxes.
I have used a YouView box with no problem via a SCART on an old TV
I invested in a Sony Bravia - installed today by John Lewis
The YouView was only recognised by the Bravia if it was switched on by the power switch - once on it bringing it out of standby via the remote and selecting the input on the Bravia would only lead to a Blank Screen on the Sony (it would also not swiitch automatically to the input the YouView was on).
Long discussion with Sony followed and Sony said "most" of their TV's would recognise YouView via HDMI - but some had "unexplained" compatability issues - when asked what I should do the Sony man said if this was important I should ask John Lewis to change the set.......
Helpful discussion with John Lewis support - I did not want to change the set and JL suggeted connecting the YouView to the Sony HDMI via an HDMI "switch" box - only connecting the YouView to the switch box. (It seems that the Sony will recognise the switch - but not the YouView directly....)
Bought a Switch from Maplin (HSW0501BN) - connected YouView to the switch and the switch to Sony Bravia TV via HDMI - and it works brilliantly.....
Turning the YouView on/off via the remote from standby changes the input source to the YouView on the Sony - and it has always been recognise by the Sony - no more blank screens.
A pain in the neck for a new TV - clearly a problem with some Sony Bravia TV's and YouView - it would be nice if both YouView (Humax) and Sony could talk together to fix it....
But for now it seems the intermediate switch gets over the issue.
I thought this was worth sharing in case anyone else has the same issue - I cannot say it will work for every-one - but it worked for me - thanks to John Lewis support.............
Solved!
Go to Solution.

Hi
It's a SONY KD-55X-8505BBU -- It's the "lo-spec" 4K model and works brilliantly.
The SONY man said "most" of their TV's work with YouView HDMI - but they have had some instances of incompatability and could do nothing about it.............
The YouView worked with the SONY - but it needed to be switched on and off for the HDMI to recognise it - I temporarily ran it through the SCART - which worked OK (to which the SONY man asked why I was concerned if it worked with a SCART!!!)
The advice from John Lewis was great - just connected the YouView HDMI to a HDMI switch box - and connected the swirch box to the SONY - it all works fine now.
It just seems that SONY are not aware (or are not prepared to tell you) the solution - and only higher level John Lewis staff are aware of this (the John Lewis installer was stumped).
Not sure anyone else will have the problem (although I have seen several reports of this on the web) - and I am happy with the solution - just wish the (paid for) installers knew - and that SONY knew/or were prepared to tell you (guess they did not want to be asked for the price of the HDMI to cure the "incompatability" problem).
I was so amazed at the poor response from SONY and I asked them to confirm that the call was recorded and took the recording number - needless to say John Lewis was not impressed with Sony telling me that the only solution was to send the set back to John Lewis -- Sony have suffered a big drop in my estimation - although the TV is brilliant......

T60p and T61 LAN adapter connection issues

Hi all,
Strange issue concerning LAN adapter on both T60p and T61. Either thinkadvantage laptop is at a different remote location connected to headquarters via a ptp link(fibre). This remote link has been updated recently. DHCP is assigned from main officeto all user locally and at the two remote sites.
For some very strange reaso, these both laptops are the only systems at the remote site that cannot get assigend ip settings via DHCP. Also if I manually assign them static ip settings, (the limited or no connectivity icon disappears) which i presumed but there is still no connectivity to these two laptops via ping cmds etc.
Even more strange is when these laptops are brought to back to headquarters and are plugged into the network here, they get assigned ip settings like they should and everything works like it should.
Also all the other systems at the remote sites get their ip settings dynamically like they should.
The LAN adapters are intel
I have reinstalled drivers, used winsock repair tools and also plugged the laptops directly into the fibre swtich on the dedicated vlan port that connects to the local swtich at the sites. Still same syptom
I am very confused at the moment and would appreciate any advice or solution. At the moment I believe its how the network card communicates with the protocol on link maybe there is an issue. I am not sure. Appreciate any input guys/gals

Hi,
Do you enable ESB email notification in ESB Control for your ESB system and mail still not received?
Some errors cannot be caught by ESB email notification (for example, you use polling DB-adapter and provide a incorrect login password and so on, you can use rejection handlers for this type of errors. I not implemented this yet in our system but think it should work).
Errors raised when you ESB-process already started - may be caught.
You will receive email with flow_id, initial payload and error message (if didn't use asynchronous calls: bug 7616012 - error message is empty when error raised after asynchronous service invocation in 10.1.3.3 (can be not visible..)).
Best Regards,
Mikhail.

FCE and FCE HD Firewire Connection Issues

Hello, I just recently cleaned out my hard drive and reinstalled Tiger 10.4.11. I reinstalled all my previous applications with out any problems, but I had an issue with both versions of FCE. For some reason it won't recognize my firewire port. I don't know if there was something else I had to do to get it to recognize. The cable is fine and the camera, because I got it to work with my Power Mac G4 last night, but it doesn't work for my laptop. Any ideas? Thanks, Matt

All HDV is MPEG-2 based. It's an HDV tape camera. The problem is QT7.4 and the older version of FCE. Some people have got this to work. I don't know how, but many others have had problems using that and older versions of FCE and newer versions of QuickTime, 7.3 and probably 7.4 as well.

Question on ARP table on 3750 switch

Hi,
So I have a cisco 3750 switch directly connected to a 2851 router gig 0/0 interface.
Should the show arp command on the switch show an entry for the IP and mac address of the routers gig 0/0 interface?
I dont see one in there now and was just wondering.
Connectivity between the switch and router work fine right now.
thanks

HI Bill,
if u can ping from Swicth ro router,,,,then please check with this command: sh ip arp.
Just for Info;
To be able to ARP a device, you must have an interface (SVI) on that switch on that network. To ARP a device you must have an interface with a layer 3 IP on the same layer 2 vlan.
You will need to connect to a switch that has an interface on that vlan on it. I would traceroute to the host, and hopefully the next to last hop is the layer 3 switch, or if it's a router, connect to it and do a show cdp neighbors and see if you can find the switch that way. (If you do connect to the router, you'll find the ARP entries there, if it's a layer 3 switch, then it's both a router and switch in one box)
"sh mac address-table". This will give which MAC is connected to which port.
"sh ip device tracking interface gigabitEthernet ". This will give which IP is connectd to a port.
"sh ip arp" will give you a IP to MAC table
Regards
Dont forget to rate helpful posts.

Connectivity issues after 8.1.1 update please help! :(

Hi all. Here's the situation.
I got my Iphone 6 on release day.
Not had one single problem with it.
On Monday however I do a general software update to IOS 8.1.1
Now ever since then I cannot keep a steady connection to both WIFI AND my roaming internet.
BOTH show as connected however load EXTREMELY slowly or not at all. No matter where I am.
I have done a soft reset.
Switching on and off.
And resetting Network Settings.
Done all these 3 or 4 times and they are not helping.
It is too coincidental to not be because of the software update.
Can someone please help me?

Still no help for you? I updated my iPhone 6 to 8.1.1 this past weekend and now have huge connectivity issues too. My home WiFi signal is 5 bars but runs very slow for example Facebook, the phone cannot update messages or photos. Try to connect for online banking, forget it. I have turned off WIFI and try using my Verizon signal which is 3 out if 5 bars, same problem. Don't understand why Apple cannot fix this apparent bug. Will call Apple Care in a few minutes and let you know what they say.

BLUTOOTH CONNECTIVITY ISSUES ON 6 PLUS

I have an iphone 6 plus and am having blutooth connectivity issues to my Mercedes. About 50% of the time there is no connectivity. To 'fix' this I often have to turn off my phone, and turn it on again. Does anyone have another workaround/fix?
Thanks!

*** IF YOU HAVEN'T REPORTED YOUR BLUETOOTH ISSUE TO APPLE SUPPORT http://www.apple.com/support/ OR APPLE FEEDBACK http://www.apple.com/feedback/, PLEASE DO SO! ***
The Apple specialist that I spoke with said the more people who report their issues, the higher probability the issue will get fixed (sooner). Don't just assume other people already reported it to Apple (or that the decision-makers at Apple read these forums). "The squeaky wheel gets the grease!"
3/29/2015
DEVICES:
4 x iPhone 6 Plus
1 x iPhone 6
4 x iPad Air 2
1 x iPad Mini 2
3 x iPad 4
VERSION:
iOS 8.1.3 >> iOS 8.2 (all devices)
VEHICLES:
2 x 2009 Mercedes-Benz E350
1 x 2012 Mercedes-Benz GL450
(will test 2008 Lexus LS600hL & 2015 LX570 later this week)
After weeks of reading about iOS 8.2 issues and how iOS 8.2 is supposed to contain a certain vague BT fix, I thought it was finally safe to risk another iOS update to fix my long-standing car Bluetooth issue with iOS 8.1.3. I WAS WRONG!
Upon updating to iOS 8.2, we noticed that our existing Bluetooth issue (started since iOS 8.0.x) was still present. Ever since iOS 8.0.x, we have had the very annoying Bluetooth issue of call audio cutting in & out when connected. After further research and testing, we determined that the cause may be that the iPhone (iOS 8.0.x and above) actually randomly disconnects and reconnect with the car's BT every 10-120 seconds, thus interrupting the audio through Bluetooth… however this behavior is difficult to detect without active Bluetooth call/audio going through the speakers.
Unfortunately, we also noticed that IOS 8.2 ADDED NEW BLUETOOTH PROBLEMS to the mix! With iOS 8.1.3, we could stream audio (I.e. Pandora, iTunes Radio, Rhapsody) at higher quality perfectly. Right after the iOS 8.2 update, everyone suddenly noticed that the audio from Pandora or other streaming music apps would briefly pause or skip & stutter every few seconds. We lowered the audio quality to "Good" instead of "Better" or "Best" but that did not make a difference ("Good" is around 64 kbps). At the same time, we did a speed test and found the 4g connection at that time was 6.8Mbps down… more than enough to stream a 64kbps signal without constant stuttering/buffering. Tests with devices still on iOS 8.1.3 show this is an isolated iOS 8.2 problem (the device streamed Bluetooth audio perfectly… was updated to iOS 8.2… Bluetooth audio was tested again and now exhibited the stuttering problem).
I hope Apple is going to fix this issue in iOS 8.3 or sooner... more and more people seem to have this (or variations) issue, and many others also are affected, probably haven't noticed (yet).
UPDATE 3/30/2015: After today’s preliminary testing with the vehicles above, this is what I found:
OUTGOING CALLS: In iOS 8.1.3, after much research and testing I have determined that the iPhone’s Bluetooth drops connection with the vehicle periodically, then immediately reconnects again, resulting in several seconds of audio silence on both ends of the call (same behavior as if you’re going through a cellular “dead zone”… but you’re not). With iOS 8.2, Bluetooth still exhibits the same issue, but now with an increased frequency. (NOTE: Unpairing & repairing Bluetooth connections as well as Resetting All Network Settings did NOT solve this problem… as other Internet posters, forums, and articles can tell you.)
INCOMING CALLS: In iOS 8.1.3, incoming calls suffered the same issues as outgoing calls (see above), but didn’t exhibit any other Bluetooth problems with my vehicles. With iOS 8.2, Bluetooth issues for incoming calls are now significantly WORSE! Approximately 75% of all incoming calls will ring twice, then drop (i.e. “Call Failed”). 90% of the time, the incoming call ring won’t transfer to Bluetooth audio (instead only ringing on your handset). (NOTE: Unpairing & repairing Bluetooth connections as well as Resetting All Network Settings did NOT solve this problem… as other Internet posters, forums, and articles can tell you.)
STREAMING AUDIO/MUSIC: In iOS 8.1.3, Bluetooth audio/music streamed fine from my iPhone to my vehicle, even with 3+ Bluetooth devices connected simultaneously. My vehicle’s Bluetooth does not support Bluetooth audio, so I have installed a Kinvo BTC450 Hands-Free Car Kit (aptX) to play streaming audio through my vehicle’s speakers. The only issue I had was that the iPhone does NOT allow manual selection of assigning specific Bluetooth devices specific functions unlike Android 4.0.4 and above (for example, with Android I could assign incoming/outgoing call functions & audio to my car Bluetooth, and streaming media audio to my Kinvo BTC450… with iPhone iOS 8.2 and prior you cannot do that so the phone Bluetooth fights to assign incoming/outgoing call functions & audio to one of the two devices… usually the one that boots up the fastest). With iOS 8.2, not only is this problem still here, but now if you have 3 or more Bluetooth devices connected (not only paired) simultaneously, then it is as if the iPhone has to buffer streaming audio every few seconds, which will pause or stutter the audio feed to the Kinvo BTC450 (or whatever Bluetooth device you use). This happens with ALL streaming audio feeds, whether it’s Pandora, iTunes Radio, Rhapsody (although it occurs less frequently with some apps than others). After unpairing and re-pairing my iPhone to the device, suddenly ALL AUDIO DID NOT WORK! After doing this several times, I resumed driving in silence… then after about 15 minutes all of a sudden the streaming audio (Pandora which I didn’t pause) started streaming through my car speakers again (although the stuttering/pausing audio issue was still present). Resetting All Network Settings did not have an effect on this problem either. (NOTE: Unpairing & repairing Bluetooth connections as well as Resetting All Network Settings did NOT solve this problem. This problem is only solved by connecting only 1-2 devices simultaneously and preventing any more devices from connecting as other Internet posters, forums, and articles can tell you.)
MY RECOMMENDATION: If you use multiple Bluetooth devices simultaneously with your iPhone/iPad (especially 3 or more)… then AVOID iOS 8.2 AT ALL COSTS! If you already upgraded (as I have), then from what I understand it’s too late to downgrade to iOS 8.1.3 since Apple doesn’t “sign” that firmware anymore… so your choices are either to live with iOS 8.2 or jailbreak... or switch to another phone manufacturer. If you don’t use Bluetooth or connect to multiple devices simultaneously (i.e. smartwatch, car Bluetooth, 3rd party car kit, radar detector, portable speaker, headphones, portable keyboard, etc) then iOS 8.2 may work OK for you. Hopefully iOS 8.3 will solve these Bluetooth issues… but based on Apple’s track record I wouldn’t hold my breath.
UPDATE 4/2/15: Tonight I tried to stream Bluetooth audio from Pandora and Rhapsody through my UE Boom. I had my Pebble Steel, Panasonic 6.0 DECT Link-to-Cell Cordless Phone System, and UE Boom connected via Bluetooth at the time. Bluetooth audio skipped 1-2 times per second. This issue is getting very frustrating... to the point where I want to throw my iPhone in the trash.

T420 internet connection issues

I'm probably over complicating this situation, since I know little about computers, but here it is.
My T420's hard drive became a victim of the "Click of death," and I had to buy a replacement. I installed Windows 7 and I now experience connection issues. I cannot connect Wirelessly or Ethernet cable. With troubleshooting I receive a "Windows did not detect a properly installed network adapter" message.
I'm assuming I have to install drivers, and I'm clueless there.

GrumpyFish wrote:
I'm probably over complicating this situation, since I know little about computers, but here it is.
My T420's hard drive became a victim of the "Click of death," and I had to buy a replacement. I installed Windows 7 with an and I now experience connection issues. I cannot connect Wirelessly or Ethernet cable. With troubleshooting I receive a "Windows did not detect a properly installed network adapter" message.
I'm assuming I have to install drivers, and I'm clueless there.
welcome to the community.
sorry you're having issues.
if you post your machine type (from sticker on bottom; don't post s/n), we can probably get you pointed in the right direction.
a question to clarify... how did you install windows and which version?
edited to add: follow-up... i believe the link below is for the wired nic in your machine. pick the 32 or 64 bit version as appropriate. once you can get on-line, you may be able to run thinkvantage system update (if it's installed) to get any other needed drivers.
http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS019204
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Unexpected shutdowns and loss of internet connectivity on brand new 420t

Hi,
I was experiencing unexpected shutdowns (would see safe mode choices when turned PC back on) and also intermittent internet connectivity issues.
To Fix:
In device manager, I turned off the option in the Realtek Network Controller Power management tab to allow the computer to turn off this device to save power.
It's been working like a charm so far (2 days). I'm not so sure HP should be building PCs with this option set. There are no updates that I haven't installed either. PC still sleeps (can see nic lights go off) and wakes up just fine.
Other that that we really like this PC...Beats Audio wasn't impressive with only the internal speakers, then I tried a good set of external tweeters and a subwoofer and then it was realized.
Hope this helps someone.

Troy,
Thanks for the suggestion. It sounds like you've heard that others have had this problem. Is that right?
And are you suggesting that the kernel panics and the loss of Internet connection are related? They often happen independently of one another.
Claire

Connection of LC/APC fiber patch cords to Cisco Catalyst 6500 $ Cisco Access 3750 Switches

I have an LC/APC fiber patch cord infrastructure and I want to connect it to Cisco Catalyst 6500 & Cisco Access 3750 Switches. what type of transceiver should be used?
I read a note on Cisco website stating the following for Cisco SFP+ transceivers:
Note: "Only connections with patch cords with PC or UPC connectors are supported. Patch cords with APC connectors are not supported. All cables and cable assemblies used must be compliant with the standards specified in the standards section"

Thank you, but my question is that I have a single mode fiber patch cord with LC/APC connector while cisco stating a note that only use LC/PC or LC/UPC type of connectors with SFP+ transceiver.
So what type of transceiver should I use to connect LC/APC patch cord to cisco switches? Is there another type or SFP+ still can be used?

3750 switch and HP switch fiber connectivity issue

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