speed and disconnection problems with ptp link of 300 mtrs

RouterOS Wireless Networking
1

hello guys,

i have setup a ptp bridge using MPLS on a RB711-5Hn pair of boards with 18dBi antenna each. distance is 300 meters.

i am facing problems like:

  1. signal in -77 at both ends even though antenna’s aligned perfectly.
  2. frequent disconnection of station from bridge and reconnection again
  3. machine to machine data copy speeds not above 1MBPS

i have pasted the info of the setup below and can give more info if required.

just fed up how to get this thing working really fast… please help…

all help that can come my way is most welcome…

<<<<<< BRIDGE >>>>>>
/interface vpls
add advertised-l2mtu=1500 arp=enabled cisco-style=no cisco-style-id=0
disable-running-check=no disabled=no l2mtu=1500 mac-address=
02:EB:C1:09:9A:FF mtu=1500 name=vpls1 pw-type=raw-ethernet
remote-peer=172.16.0.2 vpls-id=1:1
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods=“”
group-ciphers=tkip group-key-update=5m interim-update=0s
management-protection=disabled management-protection-key=“” mode=
dynamic-keys name=default radius-eap-accounting=no
radius-mac-accounting=no radius-mac-authentication=no
radius-mac-caching=disabled radius-mac-format=XX:XX:XX:XX:XX:XX
radius-mac-mode=as-username static-algo-0=none static-algo-1=none
static-algo-2=none static-algo-3=none static-key-0=“”
static-key-1=“” static-key-2=“” static-key-3=“”
static-sta-private-algo=none static-sta-private-key=“”
static-transmit-key=key-0 supplicant-identity=URVI2GIN
tls-certificate=none tls-mode=no-certificates unicast-ciphers=tkip
wpa-pre-shared-key=“” wpa2-pre-shared-key=grandmaster
/interface wireless
set 0 adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=0
area=“” arp=enabled band=5ghz-a/n basic-rates-a/g=
6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps bridge-mode=
enabled channel-width=10mhz compression=no country=no_country_set
default-ap-tx-limit=0 default-authentication=yes
default-client-tx-limit=0 default-forwarding=yes dfs-mode=none
disable-running-check=no disabled=no disconnect-timeout=3s
distance=dynamic frame-lifetime=0 frequency=5180 frequency-mode=
manual-txpower frequency-offset=0 hide-ssid=no
ht-ampdu-priorities=0 ht-amsdu-limit=8192 ht-amsdu-threshold=8192
ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7
ht-guard-interval=any ht-rxchains=0 ht-supported-mcs=“mcs-0,mcs-1,m
cs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12
,mcs-13,mcs-14,mcs-15” ht-txchains=0 hw-fragmentation-threshold=
disabled hw-protection-mode=none hw-protection-threshold=0
hw-retries=7 l2mtu=2290 mac-address=00:0C:42:93:D5:AB
max-station-count=2007 mode=bridge mtu=1500 name=wlan1
noise-floor-threshold=default nv2-cell-radius=30
nv2-noise-floor-offset=default nv2-preshared-key=“” nv2-qos=
default nv2-queue-count=2 nv2-security=disabled
on-fail-retry-time=100ms periodic-calibration=default
periodic-calibration-interval=60 preamble-mode=both
proprietary-extensions=post-2.9.25 radio-name=000C4293D5AB
rate-selection=advanced rate-set=configured scan-list=default
security-profile=default ssid=MPLS station-bridge-clone-mac=
00:00:00:00:00:00 supported-rates-a/g=
6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps
tdma-period-size=2 tx-power=22 tx-power-mode=all-rates-fixed
update-stats-interval=disabled wds-cost-range=50-150
wds-default-bridge=none wds-default-cost=100 wds-ignore-ssid=no
wds-mode=disabled wireless-protocol=802.11 wmm-support=disabled
/interface wireless manual-tx-power-table
set wlan1 manual-tx-powers=“1Mbps:17,2Mbps:17,5.5Mbps:17,11Mbps:17,6Mbp
s:17,9Mbps:17,12Mbps:17,18Mbps:17,24Mbps:17,36Mbps:17,48Mbps:17,54M
bps:17,HT20-0:17,HT20-1:17,HT20-2:17,HT20-3:17,HT20-4:17,HT20-5:17,
HT20-6:17,HT20-7:17,HT40-0:17,HT40-1:17,HT40-2:17,HT40-3:17,HT40-4:
17,HT40-5:17,HT40-6:17,HT40-7:17”
/interface wireless nstreme
set wlan1 disable-csma=no enable-nstreme=no enable-polling=yes
framer-limit=3200 framer-policy=none

<<<<<<<< STATION>>>>>>>>>

/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods=“”
group-ciphers=tkip group-key-update=5m interim-update=0s
management-protection=disabled management-protection-key=“” mode=
dynamic-keys name=default radius-eap-accounting=no radius-mac-accounting=
no radius-mac-authentication=no radius-mac-caching=disabled
radius-mac-format=XX:XX:XX:XX:XX:XX radius-mac-mode=as-username
static-algo-0=none static-algo-1=none static-algo-2=none static-algo-3=
none static-key-0=“” static-key-1=“” static-key-2=“” static-key-3=“”
static-sta-private-algo=none static-sta-private-key=“”
static-transmit-key=key-0 supplicant-identity=URVI2GIN tls-certificate=
none tls-mode=no-certificates unicast-ciphers=tkip wpa-pre-shared-key=“”
wpa2-pre-shared-key=grandmaster
/interface wireless
set 0 adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=0 area=“”
arp=enabled band=5ghz-a/n basic-rates-a/g=
6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps bridge-mode=enabled
channel-width=10mhz compression=no country=no_country_set
default-ap-tx-limit=0 default-authentication=yes default-client-tx-limit=
0 default-forwarding=yes dfs-mode=none disable-running-check=no disabled=
no disconnect-timeout=3s distance=dynamic frame-lifetime=0 frequency=5180
frequency-mode=manual-txpower frequency-offset=0 hide-ssid=no
ht-ampdu-priorities=0 ht-amsdu-limit=8192 ht-amsdu-threshold=8192
ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7
ht-guard-interval=any ht-rxchains=0 ht-supported-mcs=“mcs-0,mcs-1,mcs-2,mc
s-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14
,mcs-15” ht-txchains=0 hw-fragmentation-threshold=disabled
hw-protection-mode=none hw-protection-threshold=0 hw-retries=7 l2mtu=2290
mac-address=00:0C:42:94:5B:07 max-station-count=2007 mode=station mtu=
1500 name=wlan1 noise-floor-threshold=default nv2-cell-radius=30
nv2-noise-floor-offset=default nv2-preshared-key=“” nv2-qos=default
nv2-queue-count=2 nv2-security=disabled on-fail-retry-time=100ms
periodic-calibration=default periodic-calibration-interval=60
preamble-mode=both proprietary-extensions=post-2.9.25 radio-name=
000C42945B07 rate-selection=advanced rate-set=configured scan-list=
default security-profile=default ssid=MPLS station-bridge-clone-mac=
00:00:00:00:00:00 supported-rates-a/g=
6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps tdma-period-size=2
tx-power=22 tx-power-mode=all-rates-fixed update-stats-interval=disabled
wds-cost-range=50-150 wds-default-bridge=none wds-default-cost=100
wds-ignore-ssid=no wds-mode=disabled wireless-protocol=any wmm-support=
disabled
/interface wireless manual-tx-power-table
set wlan1 manual-tx-powers=“1Mbps:17,2Mbps:17,5.5Mbps:17,11Mbps:17,6Mbps:17,9M
bps:17,12Mbps:17,18Mbps:17,24Mbps:17,36Mbps:17,48Mbps:17,54Mbps:17,HT20-0:
17,HT20-1:17,HT20-2:17,HT20-3:17,HT20-4:17,HT20-5:17,HT20-6:17,HT20-7:17,H
T40-0:17,HT40-1:17,HT40-2:17,HT40-3:17,HT40-4:17,HT40-5:17,HT40-6:17,HT40-
7:17”
/interface wireless nstreme
set wlan1 disable-csma=no enable-nstreme=no enable-polling=yes framer-limit=
3200 framer-policy=none

2

Lots of power for short distances. Decrease the power “TX Power” Use the link to calculate the link. http://www.mikrotik.com/test_link.php

3

does high power for short distance cause disconnections?? pretty wierd…

i am boosting the power to compensate for the antenna loss… as the antennas in india which are local made are not to the quality the radio power helps overcome the losses to some extent.

why is the disconnection so much?? i am really worried :frowning:

4

cheap antennas also may have bad VSWR. In short, your own radio’s power will come back on itself, interfere and eventually likely cause the radio to fail.

You can’t fix bad equipment with more power. I wish you could.

Lowering the tx power may help, whether this is the case or not. It won’t hurt to try.

5

Hi,


-77 at 300m ? with 18 dBi Antennas?
Do you have Free LOS?

mistry7

6

clear los… that’s what has put me wondering…

7

-77dBm at 300m with 18db antenna and tx-power=17 is extremely low.
I have -53dBm at 100m with SXT(16dB antenna) and tx-power=3 with 100%ccq and no problems.
So maybe pigtails problem or most probably antennas are bad engeneered and you are out of their actual band (not what is written on them), as you say

as the antennas in india which are local made are not to the quality

…so try other antennas.

8

@kkloev

yes, i think so too.
The problem is the bad signal level.
This can depend on

Wifi-Modul (eg Used without connected Antenna)
Pigtail
Cable (quality and length)
Cable-Connections (if you have done this by yourself)
Lightning protection if Used
Antennas

mistry7