The Short Message Service SMS, as defined within the GSM 900 / 1800 / 1900 digital mobile phone standard has veral unique features:
A single short message can be up to 160 characters ( 7bit coded ) or 140 characters (8 bit coded) of text in length. Tho 140 / 160 characters can compri of words or numbers or an alphanumeric combination. Non-text bad short messages (for example, in binary format) are also supported. More about that binary mode you will find at the link PDU mode.
The Short Message Service is a store and forward rvice, in other words, short messages are not nt directly from nder to recipient, but always via an SMS Center (SMSC) instead. Each mobile telephone network that supports SMS has one or more messaging centers to handle and manage the short messages. More about SMSC you can read at the link SMSC.
agrarianThe Short Message Service features confirmation of message delivery. This means that unlike paging, urs do not simply nd a short message and trust and hope that it gets delivered. Instead the nder of the short message can receive a return message back notifying them whether the short message has been delivered or not. The default factory parameter of this acknowledge from the transmitter of a SMS to the receiver of a message by most GSM modem is OFF, so that you will get no confirmation fr
om the receiver. If you turn it on. then you get an conformation that the SMSC has got the message and after the delivery of the short message to the receiver you will get an additional, cond messsage (SMS backward) that the message is delivered to the a GSM phone or modem. In this automatic generated message is the data and time of the delivery coded. The acknowlege, the coding scheme the time of storage of a short message in the SMSC and a lot of more will be t with the command AT+CSMP.
A other way is to nd a prefix with the text message. This prefixes are not equal by the different GSM opertors in the world. By the German GSM operator Vodafone you have to add *N# and by the GSM operator T-Mobil you have to add *T#. The notation with AT+CSMP is equal in all SMSC. The handling with the pefix *T# or *N# was or is neccary if you would like to get a acknowlege by the nd of a SMS with a mobile GSM handt. Not all mobile phones can switch on the bit for a ackknowlege.
If you would like to understand the 3 parameters of this command, you have to understand the SMS in PDU mode. An other important command is AT+CNMI. It tells the GSM modem how to handle an incoming short message.
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小学四年级英语视频Short messages can be nt and received simultaneously with GSM voice, Data and Fax calls. This is possible becau whereas voice, Data and Fax calls take over a dedicated radio channel for the duration of the call, short messages travel over and above the radio channel using the signaling path. As such, urs of SMS rarely if ever get a busy or engaged signal as they can do during peak network usage times. If you switch on
the simultaneously receive of a SMS during a data call, then you will get a SMS string during a fax or data call.
Ways of nding multiple short messages are available. SMS concatenation (stringing veral short messages together) and SMS compression (getting more than 160 characters of information within a single short message) have been defined and incorporated in the GSM SMS standards. Not all that possible featurs are implemeted by all GSM operatos worldwide. Single message should work everywhere.
To u the Short Message Service, urs need the relevant subscriptions and hardware, specifically:
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tokyo什么意思 A subscription to a mobile telephone network that supports SMS. By the German GSM operators is tabe
drafthat rive by every different kind of subscription included.headaches
drill是什么意思U of SMS must be enabled for that ur (automatic access to the SMS is given by some mobile network operators, others charge a monthly subscription and require a specific opt-in to u the rvice). In Germany that is everytime included.
A mobile phone or GSM modem that supports SMS. Today this is supported by every GSM phone or GSM modem.give me your love tonight
Knowledge of how to nd or read a short message using their specific model of mobile phone or GSM modem. The implementateion is not equal by evwery unit. Not all GSM phones, PCMIA modem cards or GSM modems offers all the features that are descriped in the ETSI.
A destination to nd a short message to, or receive a message from. This is usually another mobile phone but may be a fax machine or an Email address. In some GSM networks it is possible to covert a short message to a fax or to an email.
