[Cidrz] Fwd: FW: CIDRZ and GPRS data
Daniel Myung
dmyung at dimagi.com
Fri Apr 4 13:17:52 EDT 2008
correspondence from the celtel guys.
236 kilo BIT, not great.
phone to iconnect may be faster i think especially if there was *tons* of
messages routing to a server back in CIDRZ since cidrz will be on an
iconnect pipe.
the big issue is though is that cidrz access from zambia to a server in the
US for example will probably piss off every minister in the MOH in zambia.
also, the latency running an app across the pond is rather atrocious. we
run our source control off of visual studio team foundation and the latency
for simple tasks is horrible since we're going to space and back.
bandwidth might be better when it comes to scaling up, but latency suffers
tremendously.
dan
---------- Forwarded message ----------
From: John Hameja <Hameja.J at zm.celtel.com>
Date: Fri, Apr 4, 2008 at 12:35 PM
Subject: RE: FW: CIDRZ and GPRS data
To: Daniel Myung <dmyung at dimagi.com>
Cc: James Museba <Museba.J at zm.celtel.com>, David Venn <Venn.d at zm.celtel.com>
Hi Daniel
Yes you shall be able to log-on to your machine depending on how you want to
do your network. We can assign a public ip address for your remote logins.
No we don't have hosting solutions however the concept is being worked on.
Find attached APN network topologies.
John
------------------------------
*From:* Daniel Myung [mailto:dmyung at dimagi.com]
*Sent:* Friday, April 04, 2008 6:11 PM
*To:* John Hameja
*Cc:* James Museba; David Venn
*Subject:* Re: FW: CIDRZ and GPRS data
Thanks,
We also anticipate HTTP and other TCP traffic from outside of Zambia to log
in. Do you have external world visible IPs that can be used to route
internally to CIDRZ's server? Do you have hosting solutions and/or ways to
grant CIDRZ access to such an IP for external connectivity?
Dan
On Fri, Apr 4, 2008 at 12:01 PM, John Hameja <Hameja.J at zm.celtel.com> wrote:
Hi Daniel
Yes the IP addresses that will be assigned to you shall be private – meaning
that within Celtel GPRS network. However, sending and receiving of mms
outside private IP range will not be a problem as this will be normal
internet traffic through our public IP addresses.
John
------------------------------
*From:* Daniel Myung [mailto:dmyung at dimagi.com]
*Sent:* Thursday, April 03, 2008 9:19 PM
*To:* John Hameja
*Cc:* James Museba; David Venn
*Subject:* Re: FW: CIDRZ and GPRS data
Hi all,
thanks so much for all this information. Hit the spot exactly :)
One question though for the celtel static ip. Is that an internal celtel
centric IP address, or is it world accessible?
the reason I ask is because there is a use case for data aggregated at the
cidrz server to be accessible remotely, as there is a clinic in camerroon
that wants to contribute photos and some doctors stateside that will need to
access via the web some images for their diagnoses as well.
David, to answer your question of MMS vs. Laptop, the answer is both :)
to clarify also on the remote nurse originally sending the images from the
field to central cidrz...we were looking into different transport options.
For security sake since we will be transporting patient information, we will
probably do some variation of an HTTP POST command over SSL. But yeah, the
short answer for the initial image transfer, it will be via GPRS, not
encapsulated in an MMS.
We are envisioning MMS being part of an alerting system, spawned/originated
from the CIDRZ server after the data has been received from the field.
Doctors will eventually need to login via laptop to a web interface to
provide additional documentation. But the MMS aspect would be very useful
for a realtime alerting method for docs in country.
Thanks again,
Dan
On Tue, Apr 1, 2008 at 4:58 AM, John Hameja <Hameja.J at zm.celtel.com> wrote:
Hi Daniel
Find answers below in the mail marked in red.
John
Vas and Data Services Manager
*From:* Daniel Myung [mailto:dmyung at dimagi.com <dmyung at dimagi.com>]
*Sent:* Monday, March 31, 2008 10:39 PM
*To:* David Venn; Groesbeck Parham; groesbeck parham
*Subject:* CIDRZ and GPRS data
Hi Mr. Venn,
We spoke briefly over the phone a few months back in regards to a software
development project with CIDRZ involving sending data over GPRS. CC'd to
this message is Dr. Parham, the lead point of contact on this effort. The
following message asks a flurry of questions in regards to the state of GPRS
and MMS in Zambia. We'd like to
get a better sense of what costs to consider when scaling out a nationwide
service over CelTel's network.
The project particulars are as such:
In a clinic a nurse will take a picture of a patient for diagnosis and
evaluation. The image and corresponding data will be sent via GPRS to a
central server in CIDRZ's offices. The CIDRZ office server will then MMS
the image to a doctor for his/her review.
A few assumptions we will be making in a pilot implementation.
First, we will assume that the software we develop will streamline the
preparation of the data package.
Next, we will assume that the nurse is in a place with reasonable coverage
such that GPRS (or even better, EDGE) is available to make the transmission.
Of concern though is the actual route that the data will take from the phone
out in say, Choma, back to CIDRZ in Lusaka.
This is local traffic and therefore it will routed locally on a secure pipe.
If the server has an internet connection (and static IP address) assigned by
iConnect, how will GPRS data route through the internet, will it it hit out
via satellite and back in?
There are two options to this approach,
1. we plug-in a GPRS router into Server/Lan from GPRS side then you will
have the ability to plug more servers or
computers to this router.
2. Install a GPRS card on your server and then you will not be required to
use iConnect internet service for this
purpose.
If the server has a GPRS or EDGE card, will it have a static IP or have a
DNS entry understandable such that a CelTel GRPS packet will never leave
CelTel's internal routers?
We shall assign you a separate Access Point Name (APN) and dedicate all
CIDRZ traffic to this channel and then you shall have fixed IP addresses.
If we go the route of the CIDRZ server having a GPRS/EDGE card for receiving
all inbound data from all over the country, what sort of pricing plans are
available?
Celtel access to GPRS network:
Pay per use - K1,600 per MB - 1579
15MB/month - K19,500 - Correct
100MB/month - K85,000 - Correct
Below is a pricelist I saw off the web for GPRS coverage, numbers from from
July 2007.
Pay per use - K1,600 per MB - 1579
15MB/month - K19,500 - Correct
100MB/month - K85,000 - Correct
I guess a concern is a centralized aggregation site with a "pay for
bandwidth" doesn't make it easy for CIDRZ to scale this service nationwide.
Does CelTel have an unlimited monthly data plan for computers? Also, phone
plans with unlimited data are of interest too.
Marketing to advise as they are still working on the pricing stracture on
this.
I would love the chance to speak with you again. I'm currently in the
states in Boston, if there's a time convenient for you to chat on this, I'd
really appreciate it.
Many thanks,
Dan
--
Daniel Myung
Senior Engineer
Dimagi, Inc | One Kendall Square | Bldg. 400, 4th Floor | Cambridge, MA
02139
work: (617) 621 8595 | cell: (617) 645 3236
http://www.dimagi.com/
------------------------------
*Disclaimer:*
This message is for the named person's use only. It may contain
confidential, proprietary or legally privileged information. No
confidentiality or privilege is waived or lost by any mistransmission. If
you receive this message in error, please immediately delete it and all
copies of it from your system, destroy any hard copies of it and notify the
sender. You must not, directly or indirectly, use, disclose, distribute,
print, or copy any part of this message if you are not the intended
recipient. *CELTEL ZAMBIA *and any of its subsidiaries each reserve the
right to monitor all e-mail communications through its networks.
Any views expressed in this message are those of the individual sender,
except where the message states otherwise and the sender is authorized to
state them to be the views of any such entity.
------------------------------
--
Daniel Myung
Senior Engineer
Dimagi, Inc | One Kendall Square | Bldg. 400, 4th Floor | Cambridge, MA
02139
work: (617) 621 8595 | cell: (617) 645 3236
http://www.dimagi.com/
------------------------------
*Disclaimer:*
This message is for the named person's use only. It may contain
confidential, proprietary or legally privileged information. No
confidentiality or privilege is waived or lost by any mistransmission. If
you receive this message in error, please immediately delete it and all
copies of it from your system, destroy any hard copies of it and notify the
sender. You must not, directly or indirectly, use, disclose, distribute,
print, or copy any part of this message if you are not the intended
recipient. *CELTEL ZAMBIA *and any of its subsidiaries each reserve the
right to monitor all e-mail communications through its networks.
Any views expressed in this message are those of the individual sender,
except where the message states otherwise and the sender is authorized to
state them to be the views of any such entity.
------------------------------
--
Daniel Myung
Senior Engineer
Dimagi, Inc | One Kendall Square | Bldg. 400, 4th Floor | Cambridge, MA
02139
work: (617) 621 8595 | cell: (617) 645 3236
http://www.dimagi.com/
------------------------------
*Disclaimer:*
This message is for the named person's use only. It may contain
confidential, proprietary or legally privileged information. No
confidentiality or privilege is waived or lost by any mistransmission. If
you receive this message in error, please immediately delete it and all
copies of it from your system, destroy any hard copies of it and notify the
sender. You must not, directly or indirectly, use, disclose, distribute,
print, or copy any part of this message if you are not the intended
recipient. *CELTEL ZAMBIA *and any of its subsidiaries each reserve the
right to monitor all e-mail communications through its networks.
Any views expressed in this message are those of the individual sender,
except where the message states otherwise and the sender is authorized to
state them to be the views of any such entity.
------------------------------
--
Daniel Myung
Senior Engineer
Dimagi, Inc | One Kendall Square | Bldg. 400, 4th Floor | Cambridge, MA
02139
work: (617) 621 8595 | cell: (617) 645 3236
http://www.dimagi.com/
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