Chapter 4 – Troubleshooting and Frequently Asked Questions
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide
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Chapter 4 – Troubleshooting and
Frequently Asked Questions
Troubleshooting Examples
Situation A: The modem does not respond through the serial link
If the wireless MultiModem does not respond through the serial link upon an attempted transmission of data or voice
signals, see the table below for possible causes and solutions.
Solutions for ‘no connection through serial link’ situation
If the
modem
returns …
Then ask …
Action
(nothing)
Is the modem
powered correctly?
Provide a power supply in the range of 5 to 32Vdc.
Is the serial cable
properly connected to
the modem and PC
sockets?
Check the cable connection.
Verify cable pinout.
Verify reception & transmission.
Is the communication
program properly
configured?
In communications program, verify that modem
parameters have been set to the values shown here:
Data bits = 8
Parity = none
Stop Bits = 1
Baud = 115200 bps
Is another program
interfering with the
communication
program?
Close any such application program.
Frequently Asked Questions
I just received this modem, what do I need to do?
•
You will need to call a carrier and register the ESN number with them. Sprint models (N2) must call Sprint
and Verizon models (N3) must call Verizon. Other models, N1 and N4, must contact their provider.
•
You must then activate the modem: We have Sprint and Verizon models that are preconfigured and just
needs to run through the activation steps.
•
The N1 models will need more configuration using AT commands in the Reference Guide. If that doesn’t
help, they may need to use the WPST provisioning tool.
•
The N4 model uses a RUIM card, similar to a SIM card.
Who are the carriers?
•
Sprint, Verizon, and Alltel.
I have the N1 model and I can’t get it activated on my carrier’s network.
•
You will need to configure the MDN, MIN, and maybe more settings such as the primary and secondary
channels, and the Home SID and UID.
•
The commands are: +WMDN (MDN), +WIMI (MIN), +WPCC (Primary channel), +WSCC (Secondary
channel), +WSID (SID and UID), and +WCMT=1 (to store changes)
•
You may need more settings set, so you may need to use the WPST provisioning tool application.
