Pardio E-Mail
Pardio E-Mail is the name of the service, which allows to send and receive Internet emails using NTT DoCoMo's PHS handsets. This service was launched in March of 1998. In order to use this service you will need to have either compatible with Pardio E-Mail service handset or Pardio E-Board - a special electronic mail terminal connected to PHS handset. The message size you can send or receive is limited to up to 20,000 one-byte characters or 20KB. 32Kbit/sec speed data-transfer network is used. The price per one email is 7 Japanese yen. If you send a message between two compatible handsets, it goes directly to the recipient and if he/she is in out fo service area at the moment the message may fail to get in. In case of emails via Internet, the message first goes to the company's gatewy and then to the recipient. Source: Date:04/29/2003.

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PDC
Personal Digital Cellular is a Japanese domestic 2G standard for digital cellular networks. PDC is used nationwide by Japanese mobile carriers, except au group, which introduced cdmaOne standard. PDC uses Time Division Multiple Access (TDMA) technology, which allows to divide a radio frequency into time slots and then allocate slots to multiple calls. In this way, a single frequency can support 3 simultaneous data channels in case of full-rate, and 6 channels in case of half-rate. Full-rate codec is VSELP (bandwidth - 6.7kbit/sec + 4.5kbit/sec for error-correction) and half-rate codec is PSI-CELP(bandwidth - 5.6kbit/sec + 3.45 or 2.15kbit/sec for error-correction).

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