Fiber loss

We have a new site coming online connected to our core network. The site is 4 miles away and we have dark fiber. We are connecting dual 10Gb links and are using 10g-lr-s sfps. The core has 6509s and the site is using 3850s. There is an Lc-Lc fiber patch cable on each side.  When I run the tranceiver details command on the tengigabit interfaces the receive strength is around -16dBm. How much will that value affect the traffic?  The value is the same in the 6509s as in the 3850s. 

With -16dbm you should be fine.
What power level should a source have?
It depends on the type of source. When coupled into a good test cable, the source output power will be in these ranges:
LED: -10 to -25 dBm into 62.5/125 fiber
Telcom/LAN laser: 0 to -13 dBm into singlemode fiber, to +20 dBm with DWDM and fiber amplifier systems
CATV Laser : +16 to 0 dBm into singlemode fiber
What power level should a receiver see?
It depends on the network and type of source. When measured at the end of the network cable, the source output power will usually be in these ranges:
LAN/LED: -20 to -35 dBm into 62.5/125 fiber
Telcom/LAN laser: -20 to -45 dBm into singlemode fiber
CATV Laser : 0 to -10 dBm into singlemode fiber
http://www.thefoa.org/tech/FAQS/FAQ-TEST.HTM
HTH

Similar Messages

  • Fiber loss detection by C3750X

    Hello all,
    My apologies if this seems too easy;
    An end to end fiber reading of 8db between several backbone interfaces produced a reading of 30db reported by the switch.
    What function of the switch determined this and where can i read up on it?
    Many thanks,
    Henry

    Thanks Leo,
    It's a CISCO SFP so it does support DOM; stamped on the transceiver.
    I'll check the site for the command.
    Very much appreciated.
    Henry

  • Fiber within specs but signal strength isn't high enough with LX/LH SFPs

    We have multiple runs of single mode fiber from 1 - 3 KM. They all terminate to an intermediate building approximately 150 meters from the building with the switches that are using the LX/LH SFPs on both ends. All patch cables are SM. There are no problems from the far ends to the building about 150 meters from the end building regarding interface errors, and everything seems to be great. We move the connection to the end building, and we start having a very high number of errors on the longer fiber links.
    The folks that did the fiber installation did the testing and certification, and they said from end to end (even with the intermediate patch cable installed), our loss was at most 15 db. We were told it shouldn't exceed 20 db.
    Is there any way to increase the laser power on the SFPs? Is there anything else we should look at? Thanks for your time.

    The 1000Base-LX/LH SFPs operate at the 1310nm wavelength.  The fiber loss (budgetary) at 1310nm is 0.35dB /km.  For your 2 to 6km fiber path (assuming a jumper cable in the middle) would have a light loss of 0.70dB to 2.3dB.  The connector loss is 0.75 dB (typical is <0.30dB) per connected pair.  If you had 4 connectors in a path, you would have an additional loss of 3dB; for a total path loss of 3.35dB to 4.5dB total loss.
    Fiber loss = 0.7 to 2.3dB
    Connector loss = 3dB
    ===================
    Estimated path loss = 3.7 to 5.3dB.
    If the network you are describing is a maximum of 6km long, the folks that performed the fiber installation need to find where the additional light loss is occurring.  15dB loss for this network is not operating properly.  It is possible that you have a bad fiber splice, or more typical, the fiber is bent or pinched somewhere (splice case or other) such that it exceeds its bend radius, causing excessive splice loss.
    If my assumptions are not correct, please provide a network diagram so we can understand and troubleshoot your issue. 
    Good luck!

  • Can a GLC-ZX-SM SFP (1000BaseZX) push over 1310 nm SM fiber?

    I have a couple of stretches of 1310 nm SM fiber that are over 40 KM (about 47.5 KM). Can I use a GLC-ZX-SM to push over that 1310 fiber? The Cisco tech docs indicate the GLC-ZX-SM is for 1550 nm fiber
    Jeff

    "Can I use a GLC-ZX-SM to push over that 1310 fiber"
    I dont think there are any fiber which only works for 1300nm or 1550nm.
    As per my knowledge ALL Single mode fiber are good for 1300nm & 1550nm wavelength.
    There are few things which are different for 1300nmher and something else for 1550nm.
    Like i am taking spec of one of the fiber,
    Loss at 1300nm for above fiber is 0.40nm dB/Km where as if you send 1550nm through the same loss is 0.25dB/Km.
    Similarly dispersion is different when you send 1300nm Vs 1550nm through the same fiber.
    So if you are using 1300nm through that fiber till now you can connect 1550nm through it without any problem.
    Only thing you should be considered is the age of the fiber and the loss. As with change is technology manufacturer are able to reduce the loss through fiber at a particular wavelngth.

  • ONS 15454: 1 node got LOS alarm, the other does not?

    Hello everyone,
    I've got a problem with my ONS system. As you can see in the figure, the first one is CTC view of Node1 and the second one is Node2.
    In LINEAR model, side B of Node1 connect to side A of Node2. But take a look at them, side B of Node1 is working normally, no alarm. But side A of node 2 is RED with Los of signal alarm.
    My traffic is still working good between 2 Node. It is so strange, I have never been experienced the error like this before. Please tell me what this situation is? Thank you very much.
       Figure1 - CTC view from node1
      Figure2 - CTC view from node2

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    Hi,
    Most likely you have an asymmetrical fiber loss (verify WDM span check on both nodes) or the power failure low thresholds are tuned differently on the OSC-SCM cards.
    There are no amplifiers on that link, hence, LOS is informative message indicating the threshold is exceeded, but apparently, that power level is still good enough for the muxponder to work.
    Having an amplifier would bring the connection down as on LOS amplifiers are shut down due to security requirements.
    Regards,
    /A

  • Terrible Packet Loss in Game- Please help!

    Computing statistics for 100 seconds...
    Source to Here This Node/Link
    Hop RTT Lost/Sent = Pct Lost/Sent = Pct Address
    0 Sam-PC.home [192.168.1.5]
    0/ 25 = 0% |
    1 2ms 0/ 25 = 0% 0/ 25 = 0% Wireless_Broadband_Router.home [192.168.1.1]
    1/ 25 = 4% |
    2 13ms 1/ 25 = 4% 0/ 25 = 0% L100.WASHDC-VFTTP-126.verizon-gni.net [173.66.228.1]
    0/ 25 = 0% |
    3 11ms 1/ 25 = 4% 0/ 25 = 0% G1-5-0-4.WASHDC-LCR-21.verizon-gni.net [130.81.213.68]
    0/ 25 = 0% |
    4 20ms 1/ 25 = 4% 0/ 25 = 0% so-12-1-0-0.RES-BB-RTR1.verizon-gni.net [130.81.151.230]
    0/ 25 = 0% |
    5 12ms 1/ 25 = 4% 0/ 25 = 0% 0.xe-8-0-0.BR2.IAD8.ALTER.NET [152.63.38.129]
    0/ 25 = 0% |
    6 34ms 1/ 25 = 4% 0/ 25 = 0% ae17.edge1.washingtondc12.level3.net [4.68.62.137]
    0/ 25 = 0% |
    7 33ms 2/ 25 = 8% 1/ 25 = 4% vl-3503-ve-117.ebr1.Washington12.Level3.net [4.69.158.26]
    0/ 25 = 0% |
    8 29ms 3/ 25 = 12% 2/ 25 = 8% ae-6-6.ebr1.Atlanta2.Level3.net [4.69.148.105]
    0/ 25 = 0% |
    9 30ms 2/ 25 = 8% 1/ 25 = 4% ae-63-63.ebr3.Atlanta2.Level3.net [4.69.148.241]
    0/ 25 = 0% |
    10 50ms 1/ 25 = 4% 0/ 25 = 0% ae-7-7.ebr3.Dallas1.Level3.net [4.69.134.21]
    1/ 25 = 4% |
    11 56ms 2/ 25 = 8% 0/ 25 = 0% ae-63-63.csw1.Dallas1.Level3.net [4.69.151.133]
    0/ 25 = 0% |
    12 54ms 2/ 25 = 8% 0/ 25 = 0% ae-1-60.edge2.Dallas1.Level3.net [4.69.145.11]
    0/ 25 = 0% |
    13 54ms 2/ 25 = 8% 0/ 25 = 0% 4.59.197.34
    1/ 25 = 4% |
    14 50ms 3/ 25 = 12% 0/ 25 = 0% 64.25.32.9
    0/ 25 = 0% |
    15 --- 25/ 25 =100% 22/ 25 = 88% 64.25.32.26
    0/ 25 = 0% |
    16 48ms 3/ 25 = 12% 0/ 25 = 0% 64.25.39.1
    These are the results of a test I ran, but I don't know how to solve the problem. The game is unplayable because of the amount of packet loss. I know it is an issue of connection between the game and my router, so should I get a new router if mine is old?

    The router I would imagine to be okay for the first bit, but for the sake of things, reboot the router and also try giving your ONT a reboot by unplugging it from AC power and then disconnecting the battery. Re-connect it after 30 seconds by connecting the battery and then plugging it back into AC power.
    Also, see if the packet loss takes place during specific times of the day. If your router has a WAN connection over Coax (rather than an Ethernet connection) to your ONT, also consider checking your MoCa speeds based on this FAQ. Poor MoCa speeds can suggest shoddy coaxial causing some issues, too: https://secure.dslreports.com/faq/verizonfios/3.2_MOCA#16569
    ========
    The first to bring me 1Gbps Fiber for $30/m wins!

  • At a bit of a loss with a two server set up

    I've been running a single Xserve (G5) for the last 5 years, but now we have just got one of the last new Xserves to become our main server, I want to keep the old server running light duties, but be ready to take over again as the main server if the new one went down for any reason, but with minimum fuss to switch over. I know because the are different models running different OS X server, I can't have anything like IP failover. But I can't figure out the best way to set this up.
    For instance how do you handle port forwarding, would you manually have to go to the router and change all the services to forward to the other server whenever you change? and all the services on the server, I was hoping it would be as simple as turning them back on, but I'm not sure it is because everything is looking for the old server. Just feel in a bit of a muddle.
    On our single G5 it was running the following:
    AFP ( all files stored on Xserve RAID )
    DHCP
    DNS
    iChat
    Open Directory
    Web
    Kerio Connect
    Retrospect
    Rumpus FTP server
    So now with the Intel Xserve I was going to move all the main services to that and just leave Retrospect and Rumpus running on the G5, but have it ready to take over if the Intel goes down.
    But unless I'm missing something that would involve me, plugging the Fiber channel leads from the RAID to other server, moving the User Network home drive from one server to the other, reconfiguring all the services to look for the other server, changing all the Port forwarding on the router to the other server ect…
    Doesn't sound like something that would go smoothly in an emergency

    You're setting up a failover configuration, and an attempt to increase uptime, and this capability involves the particular implementation of and the configuration of each of the services. Not all services allow this. (Google around for previous discussions of failover. Some cases and some services are ease (eg: DNS), and some cases can get gnarly.)
    AFP ( all files stored on Xserve RAID )
    Not shared, though with Xsan and shared SAN access, you can fail over via DNS changes.
    DHCP
    Not shared. Can start another server easily when the active DHCP server fails.
    The ISC DHCP server can do DHCP fail-over, and that can be retrofit onto a Mac OS X Server box with a little effort.
    Given the usual lease times, you will have some time to get the server back online before problems become systemic, or to activate a standby DHCP server.
    DNS
    Can inherently be shared; primary and secondary.
    iChat
    Not shared.
    Open Directory
    Can be shared; primary and replica.
    Web
    Not replicated, though with Xsan and shared SAN access, you can fail over via DNS changes.
    Kerio Connect
    Likely can be clustered and almost certain to allow mail to be queued, but you'd have to check with Kerio for details.
    Retrospect
    Not likely shared. I do not know the details nor status of Xsan support with this package.
    Rumpus FTP server
    Not replicated. Likely with Xsan and shared SAN access, you can probably fail over via DNS changes.
    There have been previous discussions, so some searching might find some insights. Here is [Failover Cluster Possible?|http://discussions.apple.com/message.jspa?messageID=11812720], for instance.
    Apple had documented [High Availability IP Failover features|http://docs.info.apple.com/article.html?path=ServerAdmin/10.5/en/c3fs2 9.html] in earlier Mac OS X Server releases, but most of the documentation has disappeared. (Whether this failover mechanism is considered deprecated with Snow Leopard 10.6, I don't know.) That written, the key pieces of this capability including [failoverd failover daemon |http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPage s/man8/failoverd.8.html] and [heartbeatd heartbeat daemon|http://developer.apple.com/library/mac/#documentation/Darwin/Reference/M anPages/man8/heartbeatd.8.html%23//apple_ref/doc/man/8/heartbeatd] are still listed, however. And as the documentation for that daemon states +Configuring your nodes to support IP Failover is a non-trivial task and not to be taken lightly! Significant data loss or corruption may result from poorly configured systems.+

  • Path Selection between 10 gig fiber and microwave

    Hello everyone,
    my network is running OSPF as an IGP, i have a 10 gig Ethernet  fiber connected between two sites and a microwave link as a redundant connection.
    since ospf metric is cost ( or bandwidth ), the 10 gig ethernet connection is always preferred. however, sometimes the 10 gig link is flapping or the bit error rate is bad, is there anyway to change the path selection to go through the microwave when the bit error rate in the 10 gig link is bad or the link flaps ?
    basically can we make the path selection based on anything than the speed or cost ?

    Disclaimer
    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
    Liability Disclaimer
    In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
    Posting
    Bandwidth can be a metric to OER/PfR.  Much else can be used by OER/PfR.
    The intent of this technology is sort of described by the names, Optimized Edge Routing (v1) and Performance Routing (v2).
    Both can account for path bandwidth and/or analyze performance.
    Understand typical dynamic routing protocols keep track of paths between source and destination and some have a way to "weight" paths  (for example, OSPF link cost [which by RFC, hasn't nothing to do with bandwidth, but is often based on that]).
    OER/PfR, for example, can run their own SLA tests.
    Years ago, I set up OER in large dual MPLS/VPN environment.  Our initial "problem", after activation, our WAN performance monitoring tools (and our users!) no longer "saw" any WAN performance issues.  They were still happening, but OER "saw" them first, and worked around them before the monitoring tools saw them.

  • MDS DS-SFP-FC8 GLW 9 Micron between 2 9148 switches Max DB loss?

                       Does anyone know where to find a table that would indciate what the max acceptable DB loss would be between two 9148 switches utilizing
                       DS-SFP-FC8 GLW over 9 Micron cable.
    It seems the SFP product data sheets do not provide this type of data.
    I currently have two 9148 switches running at 8Gbps
    TE link 1 is up and running at 8Gbps with 32 bb credits assigned to the port.
    TE link 2 will not stay online at any speed 2-8Gbps with 32 to 64 credits assigned. I'm fairly certain this is a DB loss problem becuase the problem follows the cable path.
    What I'm trying to resolve is how to determine what the max DB loss is over the link.
    I understand the max distance for Dark fiber is as follows: 1310nm  SMF 9.0 8.Gbps 10 km (6.2 mi)
    So when I talk to folks that analyze the cables I can be eductaed on what the max DB loss is.
    1310 SMF9.0 8.500 10 km (6.2 mi)
    DB loss is as follows for TE link 1
    Cable ID: 09 990
    OTDR End1 PASSDate / Time: 10/02/2012 02:55:39pm
    Cable Type: OS1 Singlemode
    Tester: OptiFiber (9053014 V2.6.4)
    Module: OFTM-5630 (9055001 V2.6.4)
    Overall Length: 3706.8 ft
    PASS
    Overall Loss
    PASS
    1550 nm: 1.19 dB
    PASS
    ORL: < 32.32 dB1310 nm (n=1.4660) 1550 nm (n=1.4670)
    Location Loss Status Loss Status
    (ft) (dB) (dB)
    0.0 N/A N/A N/A N/A
    73.8 N/A N/A N/A N/A
    246.1 0.30 N/A 0.74 N/A
    334.6 N/A N/A N/A N/A
    429.4 0.05 N/A N/A N/A
    496.9 0.07 N/A N/A N/A
    3573.9 0.48 N/A -0.01 N/A
    3706.8 N/A N/A N/A N/A
    OTDR End2 PASSDate / Time: 10/02/2012 01:51:32pm
    Cable Type: OS1 Singlemode
    Tester: OptiFiber (9053014 V2.6.4)
    Module: OFTM-5630 (9055001 V2.6.4)
    Overall Length: 3878.2 ft
    PASS
    Overall Loss
    1310 nm: 1.24 dB
    PASS
    1550 nm: 0.80 dB
    PASS
    ORL: < 31.53 dBWARNING:
    - Negative Loss value found in test result.1310 nm (n=1.4660) 1550 nm (n=1.4670)
    Location Loss Status Loss Status
    (ft) (dB) (dB)
    0.0 N/A N/A N/A N/A
    137.9 0.65 N/A 0.61 N/A
    3464.1 -0.72 N/A N/A N/A
    3612.5 N/A N/A N/A N/A
    3640.2 1.00 N/A N/A N/A
    3707.3 N/A N/A N/A N/A
    3776.0 N/A N/A N/A N/A
    3812.9 N/A N/A N/A N/A
    3878.2 N/A N/A N/A N/A
    Thanks,
    Mike
    OTDR End2 PASSDate / Time: 10/02/2012 01:55:57pm
    Cable Type: OS1 Singlemode
    Tester: OptiFiber (9053014 V2.6.4)
    Module: OFTM-5630 (9055001 V2.6.4)
    Overall Length: 3706.4 ft
    PASS
    Overall Loss
    1310 nm: 1.34 dB
    PASS
    1550 nm: 0.79 dB
    PASS
    ORL: < 34.25 dB1310 nm (n=1.4660) 1550 nm (n=1.4670)
    Location Loss Status Loss Status
    (ft) (dB) (dB)
    0.0 N/A N/A N/A N/A
    138.0 0.46 N/A 0.17 N/A
    303.8 N/A N/A 0.26 N/A
    3464.5 0.47 N/A N/A N/A
    3611.3 N/A N/A N/A N/A
    3641.0 N/A N/A N/A N/A
    3706.4 N/A N/A N/A N/A
    Notice the 3.42 db loss overall loss occurs on the failing side of the cable link.
    Cable ID: 09 990
    OTDR End1 PASSDate / Time: 10/02/2012 02:57:16pm
    Cable Type: OS1 Singlemode
    Tester: OptiFiber (9053014 V2.6.4)
    Module: OFTM-5630 (9055001 V2.6.4)
    Overall Length: 3884.5 ft
    PASS
    Overall Loss
    1310 nm: 3.42 dB
    PASS
    1550 nm: 0.75 dB
    PASS
    ORL: < 30.99 dB1310 nm (n=1.4660) 1550 nm (n=1.4670)
    Location Loss Status Loss Status
    (ft) (dB) (dB)
    0.0 N/A N/A N/A N/A
    73.0 N/A N/A N/A N/A
    142.6 N/A N/A N/A N/A
    245.7 0.04 N/A N/A N/A
    331.9 N/A N/A N/A N/A
    419.0 1.27 N/A N/A N/A
    488.9 N/A N/A N/A N/A
    501.1 N/A N/A N/A N/A
    586.2 0.55 N/A N/A N/A
    673.0 0.47 N/A N/A N/A
    766.1 0.21 N/A N/A N/A
    855.4 -0.01 N/A N/A N/A
    959.0 0.19 N/A N/A N/A
    3573.5 N/A N/A N/A N/A
    3706.8 N/A N/A N/A N/A
    3794.1 N/A N/A N/A N/A
    3884.5 N/A N/A N/A N/A
    1310 nm: 1.18 dB

    I believe you run 'show interface fc x/y transceiver detail', it will provide the current light levels as well as the minimum and maximum limits.
    Thank You,
    Dan Laden

  • Question related to SFP, Fiber, and switches model Compatibility for Gigs Connections

    Hi everyone,
    I am in the middle of a project where we are receiving a 2gig Internet connection from a service provider. I need to connect this to a switch , my question is related to what sfp, switch would be the most compatible. I was thinking about a 3750 switch with sfp modules, but i am not sure if a SFP 1000 sx is enough as we are receiving a 2 gig connection via fiber then I would need to use a 10G module, with 10G sfps... mm well i am very confuse... can anyone help me please in your experience with a similar situation
    Thanks.

    Disclaimer
    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
    Liability Disclaimer
    In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
    Posting
    A "2 gig" connection might mean a 10g logically limited to 2g, or it might mean the full duplex capacity of a gig link.
    The SFP+ ports on 10g 3750X modules will support either a gig or 10g transceiver.  The SPF ports, on either 10g or gig modules will only support gig.

  • Fiber Optic Power lvl

    I own a 20" Imac (2006) for 3 years I have been using the fiber optic output to my receiver via a 3 port fiber optic switch shared with a windows cpu and my tv. It took me about 6 different types of switches that to find one that did not reduce the signal to the point it was inoperable.
    About 6 months ago it just decided to stop working I assumed the cable had been damaged due to a 1 year old yanking on it. So I put off investigation until I got around to obtaining a new cable 10' (old was 10'as well) when I replaced the cable, however, it still would not work.
    I figured my switch had gone bad or something so I then checked the other devices just to be sure they still worked. I even switched to the port the Imac was using with no problems (using the new and old cables that were for the Imac). I can bypass the fiber switch and plugged the Imac directly into the receiver with no problems. While not detrimental I used to enjoy not having to expose my fiber ends to potential danger of contamination or damage. Not to mention not having to reach behind my receiver when I want to switch devices.
    I do realize my problem ma be a bit unique but has anyone heard or know if a update has recently lowered the power output of the Imac's TOSLink output port? Or if anyone knows of a better fiber switch with 3 ports that may have less loss I have tried 6 ranging from $9.99 to $78 the one I am using is
    http://www.amazon.com/gp/product/B0014Z29RW/ref=pdlpo_k2_dp_sr_3?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B0 00812QC6&pf_rd_m=ATVPDKIKX0DER&pf_rdr=11S9KZYH7K9B3BJ8QPHB
    Any help or input would be greatly appreciated

    I haven't heard of anything about an alternate power source for Digital Voice. I don't see how that is possible considering Digital Voice essentially works just like FiOS POTS does. The ONT still needs to be powered by the Battery Backup or AC Power, and that's all that would be to it.
    Now that you have FiOS, it's going to be difficult to get the Copper service reconnected. Verizon will not normally reconnect the copper unless there's something extreme or there is a medical need that requires the assurance of a copper line. You can ask around to see if you can get it connected or not, but failing that, I would invest in a small generator (tiny camping one, power draw is basically idle run lol) to keep the ONT powered up as needed for the phone service, if it is at all possible to do. The Fiber Optic cabling will remain lit since the Central Office should remain powered off of Diesel Generators/Turbines/Batteries for quite a while.
    ========
    The first to bring me 1Gbps Fiber for $30/m wins!

  • ME 3400 PACKET LOSS

    e3400 packet loss
    I have a me3400 connected as follows:
    in port G1 / 0 fiber optic switch connects 7 WS-C2960-24TC-s.
    The switches are running vlans 2960 and serves to intervlan ME3400 routing.
    All of the GTW vlans are defined in the ME3400, in addition this does dhcp for network VLANs.
    In the port f0 / 1 is defined as non-me3400 swichport and create an interconnection network with a firewall that outputs the internet
    in ports f0 / 5 f0 / 6 is set up a vlan me3400 additional servers
    problem:
    When a machine that is in the vlans, located in any switch in 2960, seeking access to the servers connected to the f0 / 5 f0 / 6 has lost and slowly, the same is true if you want to access the internet.
    Tests done from a PC on the vlans.
    If it pings with size 100 to the servers or the firewall is not a problem.
    but if you increase the size of the datagram to 500 or 1000 are lost. \
    If ping with size of 1000 from a PC to me3400 no problem.
    From me3400 If you ping the router or 100 servers with no loss size, but if it increases to 500 or more lost packets again has all of the above results that both the internet as accceso to this rather slow servers . It is worth mentioning that the vlan voip telephony and servcio not a problem.
    Assistant to the configuration of me3400
    sh ver
    Switch Ports Model SW Version SW Image
    * 1 26 ME-3400-24TS-A 12.2(55)SE ME340x-METROIPACCESSK9-M
    CPU utilization for five seconds: 9%/3%; one minute: 10%; five minutes: 9%
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    30820244 308201AD A0030201 02020101 300D0609 2A864886 F70D0101 04050030
    31312F30 2D060355 04031326 494F532D 53656C66 2D536967 6E65642D 43657274
    69666963 6174652D 32303332 33353430 3438301E 170D3933 30333031 30303031
    30335A17 0D323030 31303130 30303030 305A3031 312F302D 06035504 03132649
    4F532D53 656C662D 5369676E 65642D43 65727469 66696361 74652D32 30333233
    35343034 3830819F 300D0609 2A864886 F70D0101 01050003 818D0030 81890281
    8100EC3D 75F8B980 C2788415 51766BB5 17CA2AFC 6FA69FE7 E1CCF252 A82EFFE6
    1B2A4B25 F4B93A0F BA1DE932 FEFDA3E6 B2B8A20C 6322D58F 1164F87A 0AC837B3
    E602E824 9E692394 F616E907 6779C8C8 12111E3B C8F3BF57 1ED89E10 76767BB0
    7658715F B95F2D47 B7986E5B DE1A8C7C 71358900 1A9B7F00 0845E024 170B6031
    73650203 010001A3 6C306A30 0F060355 1D130101 FF040530 030101FF 30170603
    551D1104 10300E82 0C535749 4348542D 4D41494E 2E301F06 03551D23 04183016
    8014D21E 00624A3E A7974522 3D33F971 714928BC 412A301D 0603551D 0E041604
    14D21E00 624A3EA7 9745223D 33F97171 4928BC41 2A300D06 092A8648 86F70D01
    01040500 03818100 BC45CDE9 CD7B23D8 44B1E597 70D088D6 19935AB0 D8D52735
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