ExtremeWireless (WiNG)

  • 1.  AP7562i count of radios issue

    Posted 11-22-2018 07:13
    Hello community,

    I have AP7562i is 3x3 with 3 RF connectors: R1-A,R1-B, R1-C.
    When disconnecting the antenna from R1-A connector, but R1-B & R1-C still connected to their connectors - the transmit power is dropped to near 0.
    It seems R1-B & R1-C RF connectors are not transmitting at all.

    CLI output:

    show ver
    AP7562 version 5.9.2.5-001R
    Copyright (c) 2004-2018 Extreme Networks, Inc. All rights reserved.
    Booted from primary

    ap7562-xxxxxx uptime is 0 days, 00 hours 03 minutes
    CPU is ARMv7, No. of CPUs 2
    Base ethernet MAC address is xxxxxxxxxxxxxx
    System serial number is xxxxxxxxxxxxxx
    Model number is AP-7562-670042-xx

    ap7562-xxxxxx#show wi ra de

    Radio: 74-67-F7-xx-xx-xx:R1, alias ap7562-xxxxxx:R1
    STATE : On
    PHY INFO : Bssid: 74-67-F7-xx-xx-xx RF-Mode: 2.4GHz-wlan
    ACCESS POINT : Name: ap7562-xxxxxx Location: default Placement: Outdoor
    CHANNEL : Current: 1 Configured: smt Width: 20MHz
    TRANSMIT POWER : 20 dBm
    ANTENNA USAGE : 3x3
    MAXIMUM DATA RATES : Phy: 288 Mbps User: 216 Mbps
    PHY SETTINGS : Short Preamble: N Dual Channel: N Spectrum Mgmt: N
    RATE SELECTION : Standard
    ANTENNA DOWNTILT : Not-Supported
    RADIO SHARE MODE : Off
    TRANSMIT BEAMFORMING : Enabled
    MU-MIMO : Not-Supported
    SCAN_AHEAD CHANNEL : -
    ERP COEXISTENCE : ERP Protection: N Non-ERP detected: N Non-ERP associated: N
    HT COEXISTENCE : HT Protection: nonmember mode, Non-HT detected: Y
    Current Channel Width: 20Mhz, reason: per configuration
    Num of Mcast Streams : 0 (max:25)
    Multicast streams :
    # MP Mcast Streams : 0
    WLAN MAP :
    BSS-1 : test123* (*=primary)
    Shutdown WLANs :
    MESHPOINT map :
    BSS MAP :
    BSS-1 : basic-rates = 1 2 5.5 11
    : supported-rates= 1 2 5.5 6 9 11 12 18 24 36 48 54 mcs-1s mcs-2s mcs-3s
    Last error :

    Any ideas?

    Thanks,

    Aviv Kedem



  • 2.  RE: AP7562i count of radios issue

    Posted 11-22-2018 08:00
    This is by design; broadcast traffic (beacons etc) are sent via R1-A only.



    This is not a feature of the AP7662 this is a part the mimo standard



  • 3.  RE: AP7562i count of radios issue

    Posted 11-22-2018 09:37
    Hello Andrew,

    I talking about t's AP7562, not AP7662.
    How can I make it transmit trroght all of RF connectors ?

    Thanks



  • 4.  RE: AP7562i count of radios issue

    Posted 11-22-2018 10:05
    Hello,

    rfs4k(config-profile-default-ap7562-if-radio1)# no dynamic-chain-selection

    This command may solve the issue.



  • 5.  RE: AP7562i count of radios issue

    Posted 11-22-2018 10:07
    How can I make it transmit trroght all of RF connectors ?

    You connect a antenna on all connectors


  • 6.  RE: AP7562i count of radios issue

    Posted 11-22-2018 11:16
    Your method of testing is invalid. by removing the R1-A antenna, you are effectively stopping the unit from broadcasting the SSID, the additional R1-B and R1-C do not come into play until a mobile unit is associated. This is not related to the model of an access point or even a manufacturer this is a feature of MIMO.


  • 7.  RE: AP7562i count of radios issue

    Posted 11-22-2018 12:26
    Hello Aviv,

    If you insist on using only 2 antennas, I would recommend removing the antenna from R1-B, reattaching to R1-A (so you should have antennas on R1-A and R1-C only) and changing the antenna mode to 2x2.

    Run the following commands either from AP profile or self:
    #interface radio 1
    #antenna-mode 2x2
    #com wr[/code]Thank you,

    Chris


  • 8.  RE: AP7562i count of radios issue

    Posted 11-22-2018 12:26
    Hello Chris,

    I trying to split the wireless coverage of the AP for 2 small frigidaired rooms.
    antenna-mode 2x2 Not changed anything for me.[/code]Thanks,

    Aviv K



  • 9.  RE: AP7562i count of radios issue

    Posted 11-22-2018 12:41
    Hello Aviv,

    - AP7562i as it certified for IL comes with facade antenna which is perfectly tuned. Replacing integrated antenna is a regulatory violation. But who cares.
    - 802.11n and 802.11ac utilize all available antennas while listening. Every additional antenna provides roughly 2dBm on RX. This is calls MRC (Maximal Radio Combining) and considered as a main benefit coming with 11n.
    - Replacing factory antennas with a "better ones" will bring you improvement not because you will send a better signal at a maximum power but because better antennas will provide a better gain on listening the clients.
    - Sending "better" signal to the air will create additional co-channel interference which kill the service
    - As others said, management traffic is always sent as a single stream with single antenna (normally A). As well as to legacy clients and single stream clients.
    - 802.11n and 802.11ac access point is designed to use all antennas in a same RF environment simultaneously. I.e. any client should create a signal on all antennas - than MRC will work.
    - In case the "design" presume to use antennas in separated RF environments (like in a different freezers) than disabling MRC with "antenna-diversity" will solve the issue. Although dramatically decrease performance
    - "no dynamic-chain-selection" will require 802.3at power and did not bring any feasible benefits

    Misha


  • 10.  RE: AP7562i count of radios issue

    Posted 11-22-2018 12:41
    Hello Миша,

    The goal in this case is to split the wireless coverage of the AP for 2 small frigidaired rooms.
    So tested with "antenna-diversity" but without any change on AP7562, but with AP6532 "antenna-diversity" is working well.
    Tried with 2x2 mode - with no change.
    Tried configure with TKIP only mode + "antenna-diversity" to do it work in legacy mode - no change.

    Any suggestion for suitable configuration in this case?

    Thanks a lot!

    Aviv K



  • 11.  RE: AP7562i count of radios issue

    Posted 11-22-2018 12:41
    Hello Aviv,
    Even if we manage to send unicast frames to clients in isolated freezer with antenna B or C. Beacons and broadcast will _always_ sent from antenna A.
    As I said, AP is designed to use all antennas simultaneously - it is how 802.11 works.

    Misha