CC-2401K2 Page 55 of 66 2007, Copeland Communications, Inc. CC-2401K2 Datasheet Rev 1.5 SEE (RVC3), Ring Validation Control 3 Bit D7 D" />
參數(shù)資料
型號： CC-2401K2A-CS
廠商： Copeland Communications Inc
文件頁數(shù)： 51/66頁
文件大小： 0K
描述： MODEM 2400BAUD SECURE 3.3V
標(biāo)準(zhǔn)包裝： 30
數(shù)據(jù)格式： V.21，V.22，V.23，Bell 103
波特率： 2.4k
電源電壓： 3 V ~ 3.6 V
安裝類型： 表面貼裝
封裝/外殼： 模塊
包裝： 散裝
配用： 539-1002-ND - KIT EVALUATION WORLD MODEM II
其它名稱： 539-1010
CC-2401K2A-CS-ND
Data Sheet
CC-2401K2
Page 55 of 66
2007, Copeland Communications, Inc.
CC-2401K2 Datasheet Rev 1.5
SEE (RVC3), Ring Validation Control 3
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
RTO[3:0]
RMX[3:0]
Type
R/W
Reset Settings = 0001_0110 (0x16)
Bit
Name
Function
Ring Timeout.
These bits set when a ring signal is determined to be over after the most recent ring
threshold crossing.
RTO[3:0]
Ring Timeout
0000
80 ms
0001
128 ms
0010
256 ms
-
7:4
RTO[3:0]
1111
1920 ms
3:0
RMX[3:0]
Ring Assertion Maximum Count.
These bits set the maximum ring frequency for a valid ring signal. During ring qualification,
a timer is loaded with the RAS[5:0] field upon a TIP/RING event and decrements at a
regular rate. When a subsequent TIP/RING event occurs, the timer value is compared to
the RMX[3:0] field, and if it exceeds the value in RMX[3:0], the frequency of the ring is too
high, and the ring is invalidated. The difference between RAS[5:0] and RMX[3:0] identifies
the minimum duration between TIP/RING events to qualify as a ring, in binary-coded
increments of 2.0 ms (nominal). A TIP/RING event typically occurs twice per ring tone
period. At 20 Hz, TIP/RING events would occur every 1/(2 x 20 Hz) = 25 ms. To calculate
the correct RMX[3:0] value for a frequency range [f_min, f_max], the following equation
should be used: RMX[3:0] x 2 ms = RAS[5:0] – 2 ms – (1 / (2 x f_max)).
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