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Redes de Computadoras

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El formato <strong>de</strong> la cabecera es:<br />

<strong>Re<strong>de</strong>s</strong> <strong>de</strong> <strong>Computadoras</strong>, 2007/08<br />

• VCI (Virtual Channel In<strong>de</strong>ntifier). Establece el VC que la celda<br />

<strong>de</strong>be seguir.<br />

• PT (Payload Type). Indica el tipo <strong>de</strong> carga útil que transporta<br />

la celda: (1) datos, (2) información <strong>de</strong> control o (3) celda <strong>de</strong><br />

relleno (cuando el medio no permite <strong>de</strong>jar <strong>de</strong> transmitir celdas).<br />

• CLP (Cell-Loss Priority). I<strong>de</strong>ntifica la prioridad <strong>de</strong> la celda a<br />

la hora <strong>de</strong> ser <strong>de</strong>sechada (usada en el mecanismo <strong>de</strong> control <strong>de</strong><br />

congestión <strong>de</strong> los conmutadores).<br />

• HEC (Hea<strong>de</strong>r Error Control). Código <strong>de</strong> Hamming que permite<br />

<strong>de</strong>tectar y corregir errores (en la cabecera).<br />

31.4 Las celdas ATM 550

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