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Old 11-12-2007, 08:51 PM
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Common NAM Performance Tweaks.

Common NAM Performance Tweaks.
------------------------------


A little about our friend "NAM". NAM is an acronym for Numeric Assignment Module and is the place in TDMA/CDMA equipment where your phone number, ESN, system information and data settings live. In the old days we programmed handsets by hand, now it is usually done OTA (much is preset, a little is manually entered, data provisioning is truly OTA).

In this thread we will talk about (2)two common adjustments which will impact cellular/PCS performance.


ACCOLC - Access Overload Class - This code determines your priority to make and receive calls on the network. Higher the number, lower the priority. Lower the number, higher the priority. Emergency Services reserves 0 + 1 (please do not use these) leaving your choices to 2-9. Years ago we began defaulting this code to the last digit of a users MIN to help assure equal priority seeding.

SCI - Slot Cycle Index - This determines how often a handset polls the network for coverage and incoming packets. The default value is 2. A "Slot" is 1.28 seconds and doubles with each incremental change from 0 to 7 (0=1.28, 1=2.56, 2=5.12 seconds, etc). setting a handset to poll more often may use noticibly more battery if coverage is thin or lacking.



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NOTE: - The NAM is a sensative place. DO NOT MAKE ADJUSTMENTS YOU DO NOT FULLY UNDERSTAND as performance and usability will be affected.
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Things you will need:

MSL - Unique to each phone. Calculated using the ESN. Used to "open for editing". You can get this from your carrier.

http://forum.ppcgeeks.com/attachment...8&d=1184973825
------------------


Enter the handset programming mode by going to the phone screen and dialing

##778# ( alternate carrier ##778 ) or ##PST#


"View, Edit, or Cancel" (SEE IMG1)

Choose "Edit" It will ask for your MSL, enter this number now.

The first screen shows various info including "NAM Name", ESN. Your LEFT softkey choice should offer you "View Info".

Choose "View Info" then select "NAM Settings"


The screen will reload with your NAM specific settings. At the very bottom of "NAM Settings" you will see:

- ACCOLC (Access Overload Class). Adjust this number down as low as 2. (SEE IMG3)


Choose "View Info" then select "Modem Settings"


The screen will reload with your Modem specific settings. The top option is

- Slot Cycle Index - Default is 2, adjust between 0 and 7. (SEE IMG2)


Exit the program, perform a soft reboot and you are all set.





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Glossary:
------------------

ACCOLC - Access Overload Class - This code determines your priority to make and receive calls on the network.

SCI - Slot Cycle Index - - This determines how often a handset polls the network for coverage and incoming packets. The default value "Slot" is 1.28 seconds and doubles with each incremental change from 0 to 7.

MIN - Mobile Identification Number - Unique 10 digit number used to identify the mobile subscriber (User Phone Number).

ESN - Electronic Serial Number - Unique number embedded into the hardware engine to identify the hardware.

MSL - Master Subsidary Lock - Your Carrier Locked Handset unlock code .

NAM - Numeric Assignment Module - Traditional Analog, FDMA/TDMA/CDMA handset provisioning (programming) location. MIN, ESN, NID, SID, PRL, PRI as well as various data settings are all coded within the NAM.

SID - System ID

NID - Network ID

PRL - Preferred Roaming List

PRI - Primary Rate interface
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Last edited by canospinach; 11-30-2007 at 05:09 PM. Reason: i speak typo
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Old 11-12-2007, 09:04 PM
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Well, my ACCOLC is defaulted to zero already...
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Old 11-12-2007, 09:25 PM
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It's 0 in his screen shot as well So its safe to assume that is ignored. The slot cycle index was 2 on the 6700 by default, which did give you a pretty slow first ring time - changing to 1 did help.
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Old 11-12-2007, 09:35 PM
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Quote:
Originally Posted by Krayziepop View Post
Well, my ACCOLC is defaulted to zero already...
I would venture a guess that the last digit of your MIN is 0.

ACCOLC became a real issue for me recently with the California wildfires. There was a day in which i could not make calls due to how busy the system was. I changed my code to 0 so that i would be able to get to the network.

However if everyone changes their code to 0 then it would clearly defeat the purpose.
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Old 11-13-2007, 12:47 AM
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Very helpful. Thank-you!
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