Paragraph 26
An Operator’s rules and practices must require—
(a)
that each system-participant is able to send and receive properly authenticated dematerialised instructions;
(b)
that each system-member has arrangements—
(i)
for properly authenticated dematerialised instructions attributable to him to be sent;
(ii)
for properly authenticated dematerialised instructions to be received by or for him; and
(iii)
with a settlement bank for payments to be made, where appropriate, for units of a security transferred by means of the relevant system; and
(c)
that each participating issuer is able to respond with sufficient speed to Operator-instructions.