Chapter 6 General
6.1 Specifications
6-22
6.1.35.7 Protocol Control Time
When no data error occurs, protocol control time (T
m
, T
n
, T
u
) is as follows.
1 V.17, V.29, V.27ter
2 V.34
6.1.35.8 Throughput
The sending time is calculated in the following formula:
Sending time = Call setup time + Tm + (N x Tp) + {(N-1) x Tn} + Tu (sec)
(N: Send quantity, Tp: Image transmission time)
6.1.36 Cable Characteristics
With pseudo cable from 0 to 15km, the highest speed shall be guaranteed for communication with V.17, V.29,
and V.27ter. For V.34, 33600bps communication speed shall be guaranteed from 0 to 2km, 31200bps or
higher communication speed from 2 to 9km, and 19200bps or higher communication speed from 9 to 15km.
6.1.37 Communication Load Characteristics
Data error characteristics for noise and cable loss during communication are as follows:
Error rate (Error frequency/Total communication quantity) < = 1/500
6.1.38 Incoming Call Level
Under ideal conditions (flat line, no noise, and no other line stress), normal communication shall be guaran-
teed in the range from -3 through -43dBm.
For V.17, V.29, and V.27ter, the highest speed shall be guaranteed in the range from -6 through -43dBm. For
V.34, 33600bps communication speed shall be guaranteed in the range from -9 through -19dBm, and
16800bps or higher communication speed in the range from -19 through -43dBm.
For V.34, normal communication shall be guaranteed in the range from -9 through -43dBm.
Table 6-25
Mode
Before
messages: Tm
Between
messages: Tn
After
messages: Tu
Total
Standard protocol 16.4 sec. or less 3.2 sec. or less 4.4 sec. or less 24.0 sec. or less
Table 6-26
Mode
Before
messages: Tm
Between
messages: Tn
After
messages: Tu
Total
Standard protocol 9.9 sec. or less 1.0 sec. or less 0.9 sec. or less 11.8 sec. or less
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