User guide

August 2001 239

R2-CCITT - Chinese Implementation

The Chinese implementation of the R2-CCITT protocol uses the

same timing and bit patterns as the R2-CCITT shown in

Table 43. The only difference is that signaling bits C and D are

both set to 1.

R2-CCITT - Brazilian Implementation

The Brazilian implementation of the R2-CCITT protocol uses

the same timing and bit patterns as the R2-CCITT, except the

receiving end answers the line by transmitting 01/11/01. This

pattern is an answer, followed by a Clear Back, then a second

answer. The receiving end transmits the answer for

RDG_LOCAL_DOUBLE_ANSWER_ON. It transmits the Clear

Back for RDG_LOCAL_DOUBLE_ANSWER_OFF. The Clear

Back signal in this double answer procedure disconnects any

collect calls.