Javascript PDU Converter Written by Swen-Peter Ekkebus View Swen-Peter Ekkebus's LinkedIn profile
Updated by Andrew Alexander  View Andrew Alexander's LinkedIn profile (v1.5) and Milan Chudik (v1.4)
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PDU Format Converter (Encoder/Decoder) for GSM SMS. This release v1.5r9.

PDU SMS message creatorHexadecimal PDU Message Entry/DisplayResultant 7/8/16 Bit readable PDU Message
Alphabet Size 7816
Message Class
Validity (Relative)

Show User data translation (7 bit only)

SMS (Short Message Service) can contain up to 160 characters, using the 7-bits GSM default alphabet or 140 characters for an 8 bit alphabet or 70 characters for a 16 bit UCS-2 alphabet.

This current version has several specific shortcomings (and more). One of these is it doesn't attempt to deal with embedded headers at the start of messages. It isn't meant to be a replacement for a tool like pduspy

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