[afnog] Channelising E1s

[Bernard Wanyama]

Peter,

If you are not constrained on serial capacity, go ahead and give the
client 512Kbps at Layer 1/2, then you can provision the 256 up / 256
down at Layer 3 on the bandwidth manager.

That way, you will not have a bottleneck on the line.

Fixing the bandwidth to 256Kbps on the line will subject the user to
HDLC/PPP overhead (approx 6-8 Kbps per timeslot).

Mark,

In UG, ISPs have the tendency of selling Internet bandwidth in a
fashion like - 256Kbps down / 256Kbps up means 512Kbps.



Kind regards,

Bernard

2008/7/8 philemon <philemon at drtvnet.cg>:
> Hi Peter
>
> This is not a definitive response to your problem but just some elements
> which can contribuate to understand what you are facing to.
>
> The first problem is to know what type of Modulation your system uses: TDMA,
> FDMA, FDM, OFDM...? It is very important... i.e. if it is TDMA, only 1
> timeslot (not 4) is really used in a given time (even if it is a veru short
> time)...so durint that time you have not 64kx4...
>
> A service pipe (guaranteed 512k for exemple) is linked to many others
> features. Mainly it is linked to A GIVEN QoS type(RT, NRT...CIR/MIR). In you
> case it seems you want to link your 512k pipe to 4 QoSs!
>
> If your system can provide a '512k QoS', then set a pipe using this QoS;
> using the RT type if you need a symetrical flow Up/Down.
>
> Reagards
>
> Philemon
> KISSANGOU Jean Philemon
> Directeur Technique DRTVnet (ISP)
> BP. 2852 Brazzaville Congo
> Tel. 002425360396
> www.drtvnet.cg
>
> ----- Original Message -----
> From: muhump at mtn.co.ug
> To: afnog at afnog.org
> Sent: Tuesday, July 08, 2008 7:55 AM
> Subject: [afnog] Channelising E1s
>
> Hi good people,
>
>
>
> I would like some help, when provisioning a customer who has requested for
> 512Kpbs i.e. 256K Up/256 Down, I allocate 4 timeslots i.e. 64k * 4 = 256K
> knowing this is full duplex so it becomes 256k * 2 = 512K. But my problem
> is; the customer doesn't seem to reach the whole 512K total Up and Down. My
> question is; should I be allocating 8 timeslots for a 256K UP / 256K DOWN
> customer to make sure there is a guaranteed 512K pipe? Or there is another
> problem I should investigate.
>
>
>
> Please give me some advice on this.
>
>
>
> Regards,
>
>
>
> Peter Muhumuza
>
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