Only 1 SM can get the full 3megs at a time, my real question is how much bandidth the 900 ap can have
This is pretty much standard on all my 2X 900 links SM to AP…
Device Information
Device Type : 900MHz - Subscriber Module - 0a-00-3e-90-3e-5c
Software Version : CANOPY 8.1.5.1 SM-DES
Software BOOT Version : CANOPYBOOT 3.0
Board Type : P9
FPGA Version : 041006
Uptime : 64d, 00:47:12
System Time : 02:33:37 10/13/2007
Ethernet Interface : 100Base-TX Full Duplex
Subscriber Module Stats
Session Status : REGISTERED VC 23 Rate 2X/2X VC 240 Rate 2X/2X
Registered AP : 0a-00-3e-91-94-69
RSSI : 2236
Power Level : -52 dBm
Jitter : 3
Air Delay : 168 approximately 4.68 miles (24696 feet)
Downlink RATE: 2858496 bps
Uplink RATE: 1410560 bps
Aggregate RATE: 4269056 bps
Pkt Xmt (Act/Exp): 236/0
Pkt Rcv (Act/Exp): 461/0
Downlink Efficiency: 100 Percent
Downlink Index (Act/Max): 100/100
Frag Count (Act/Exp): 11166/11166
Uplink Efficiency: 100 Percent
Uplink Index (Act/Max): 100/100
Frag Count (Act/Exp): 5510/5510
I think the number you are looking for is 22 Mbps EFFECTIVE THROUGHPUT
I remember that number from somewhere…
Somebody correct me if I am wrong, Thanks.
CM
P.S. We have a few 900APs with 50 plus users and one with 73 and the just keep on going… the 73 subscriber unit does bog some at peak usage times and will be adding another unit soon to alleviate the over run… hope this answers your question!
CM
cmoshier, what do you set your QoS settings at and how much bandwidth do you provide at the tower?
QOS on the subscriber is set according to the bandwidth plan customer signed up for with a 3meg burst on the upload and 8 meg burst on the download. See example:
Sustained Uplink Data Rate : 500 (kbps) (Range: 0-- 40000 kbps)
Sustained Downlink Data Rate : 1000 (kbps) (Range: 0-- 40000 kbps)
Uplink Burst Allocation : 3000 (kbits) (Range: 0 – 500000 kbits)
Downlink Burst Allocation : 8000 (kbits) (Range: 0 – 500000 kbits)
CIR Bandwidth Settings
Low Priority Uplink CIR : 500 (kbps) (Range: 0 – 20000 kbps)
Low Priority Downlink CIR : 500(kbps) (Range: 0 – 20000 kbps)
Hi Priority Channel : Disabled
The QOS on the AP is maxed and the tower is fed 60meg BH running at 19 to 21 meg up and 19 to 20 meg down.
DHCP from our router is capped at 1.5meg per unit unless otherwise specified.
Our system currently feeds off a 25Meg pipe from our provider.
cmoshier wrote: I think the number you are looking for is 22 Mbps EFFECTIVE THROUGHPUT
I remember that number from somewhere...
Somebody correct me if I am wrong, Thanks.
I don't believe that is accurate for the 900MHz units, which is the question being asked. The best I have personally seen is around 4.5Mbps aggregate between the downlink and upllink combined. Depending on how you set the ratio, that can easily be approximately the 3Mbps quoted in the original message.
That is in 2X mode with high quality links.
3Mbps aggregate is right… I think I was thinking of AP cpability… My Bad!
That was my big question whats the 900MHz AP capability
Signaling rate according to the documentation is 3.3Mbps, with a typical aggregate throughput of 2.4Mbps to the subscriber and the ability to service 200 subscribers in software configuration.
As per the Planning guide:
The aggregate throughput requirement for each AP needs to be considered. This
includes all downlink data to all subtending SMs and all uplink data from all SMs that link
to the particular AP.
While a single AP can communicate with up to as many as 200 SM’s, keep in mind that
the aggregate throughput is distributed across the SMs that are actively getting data
simultaneously.
Again, if this is wrong, someone point it out.
cmoshier wrote: 3Mbps aggregate is right... I think I was thinking of AP cpability... My Bad!
Are you saying the 900MHz AP is capable of much higher than 4.5Mbps aggregate, but that any given SM can't reach the full bandwidth of the AP?
I use my 900MHz link for a single, rural, private point to point link in a NLOS setup through some trees (hence the need for 900MHz). There is always only 1 SM registered on the AP.
But are you saying a second SM could concurrently also pull 3-4 Mbps and the 900 AP's bandwidth is closer to 22Mbps??? If so, might it also be possible to put a second SM at the same destination and use channel bonding or a dual WAN router with load balancing or something to get higher throughput than you can achieve with a single SM?
Effectively, all I am looking for is equivalent to a backhaul, but I need NLOS and the ability to penetrate trees.
cmoshier wrote:
While a single AP can communicate with up to as many as 200 SM’s, keep in mind that
the aggregate throughput is distributed across the SMs that are actively getting data
simultaneously.
I don't think so... I still think the AP would be the regulating factor in this scenario.