Maybe just bad hardware at Subscriber B? Last week we had an XR-9 ptp link in Houston that behaved somewhat similarly, great speed in one direction, but next to nothing in the other. Shotgunning the radio & motherboard (an Alix) fixed it. Haven't gotten it back yet so don't know which went bad.
Tom S. ----- Original Message ----- From: "Tom DeReggi" <wirelessn...@rapiddsl.net> To: "WISPA General List" <wireless@wispa.org> Sent: Tuesday, September 15, 2009 5:25 PM Subject: [WISPA] Mikrotik Problem - 900Mhz-WDS-incremental speed degrade tpZero then drop- repeat. >I have a problem with Mikrotik I have not been able to solve. Wondering if > anyone has any insight. > > A summary config is.... > > I have a 433AH setup as AP with 1 XR900 and 1 R5H (5.8Ghz). The Cat5 > Ethernet port goes to a SMC VLAN switch, where the SMC tags and untags > VLAN > ID, and continues to the Backhaul Radio. My point here is the MT itself > does > not have any VLAN configured. > > I need everything to act as a True Bridge, so I'm using WDS on everything. > Both mPCI cards are set up as "AP" and then WDS interfaces configured. > The R5H sector has one subscriber, so there is one WDS interface created > for > that. The XR900 has two subscriber points. So there are two WDS > interfaces > set up for the XR900 sector, one for each subscriber. So all three WDS > interaces and the Ethernet (to backhaul) are all bridged togeather under > one > Bridge. > > SubscriberA has a 433AH also, and actually is a repeater site. So it has > two > mPCI each configured for WDS, and then the WDS ports bridged togeather. > The > primary mPCI that connects to the above first AP, is set for WDS Slave. > This subscriberA (repeater radio) works normally. I can run MT bandwdith > test continually at consistent speed. > > As well, the subscriber for the R5H sector above also is set up for WDS > Salve, and works properly, and tests consistently with Bandwdith test. > > SubscriberB for 900Mhz sector is the problem. It is a RB411 w/ a 24V-1A > PS, > w/ XR900. Originally it was set for WDS Slave also. It is now set for WDS > Station, and performs the same as if WDS Slave. When running MT Bandwdith > test both UDP or TCP, Sitting at the 433AH AP's winbox, I get the > following > results.... TXing it works perfectly and consistently. > But if doing a receive test.... It starts out at about 800 kbps, then > slowly > reduces speed incrementally, down to 500 kbps, to 300kbps, to 100kbps, > etc, > down to Zero. When it reaches Zero mbps, the radio link disconnects, and > immediately restarts itself. Speed starts back up at 800 kbps or so, and > the > same thing repeats. If doing Bi-directional tests of course the same thing > applies, because it receives also. > > Noise is low at teh SU, about -67, and -74 at AP. At first I thought it > was > noise at the IP, because occastionally SNR gets very low. .But.... > SubscriberA has a lower signal at -84 and does not experience the same > problem. Just for grins, I tried playing around with TRansmit power at > the > SubscriberB, but that had no positive effect. As well, as a test, I > disabled the second WDS interface to SubscriberA, and no change. > > To be clear... SubscriberA and SubscriberB each have their own WDS > interface > configured on WLAN1 of the 433AH AP. > I am using embedded MTOS V 3.10 on each. > > What is causing this problem? Why is speed received from my SubscriberB > incrementally degrading and breaking link? > > Bridge loops? Is my config valid? RB411 Bug? > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
