• Current used in GSM telecom equipment is DC current.

Explanation:

  • Logic is very simple. AC can’t be stored and DC can be stored.
  • Example : Mobile is a GSM device in which DC is used to charge the batteries.

What is GSM ?

  • GSM (Global System for Mobile Communications) is a second-generation digital mobile telephone standard using a variation of Time Division Multiple Access (TDMA).
  • It is used for three digital wireless telephone technologies such as CDMA (Code Division Multiple Access), GSM and TDMA.
  • GSM digitizes and compresses voice data, then sends it down a channel with two other streams of user data, each in its particular time slot.
  • It works at either the 900, 1800 or 1,900MHz frequency bands.

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