Gsm Circuit Switched Data (Csd) Service - Honeywell CNI2 Operating And Installation Manual

GSM Circuit Switched Data (CSD) Service

For CSD service the GSM service provider must support asynchronous circuit-switched data
(CSD) exchange at 4800 or 9600 baud. The baud rate must match the baud rate of the central
computer's modem. Sometimes this capability may be included as part of a standard voice
package or it may be an add-on feature at extra cost.
One consideration when ordering service is the frequency of calls to and from the CNI2. Each
service provider offers different packages that may include a fixed number of minutes per month
for a fixed price. However, when this number is exceeded, the cost per each additional minute
can be very high. There are also variations in the way "minutes" are measured. For example, a
call lasting 1 minute 10 seconds may be considered to be a 2-minute call by some providers. It
might be possible to purchase less expensive packages that have additional "weekend" or
"evening" minutes, and then schedule the CNI2 to call in at those times. Some plans may offer
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the 1 minute free. This might be advantageous for short calls.
Another consideration when ordering service is the location of the CNI2 with respect to the
service provider's network. It is best to describe where the units will be located and where they
will be calling, otherwise you could be charged "roaming" or long-distance fees. Some providers
offer free long distance or no roaming charges as part of their basic plans.
The final consideration is the direction of the calls. If the CNI2 is to originate calls, then the
service must support "mobile-originate" service. If the unit is to receive calls, then "mobile-
terminate" service is required.
The service provider will need the following information:

Type of cellular service desired, which is circuit-switched data (CSD).

The device type, which must be specified as the "CNI2 / GSM24".

Data mode is to support 4800 or 9600-baud operation. This rate must match the speed
of central computer's modem.

Mobile-originate and/or mobile-terminate service.

Number of minutes per month.

Location of the CNI2 and the location of central computer (to determine if "roaming" or
long distance charges apply).

The service provider may need to know the "IMEI" number printed on the radio.
CNI2 Operating and Installation Guide
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