ch1786nh ETC-unknow, ch1786nh Datasheet - Page 14

• Manufacturer Part Number: ch1786nh
• Description: Ch1786 Family Ultra Small 2400bps Modems
• Manufacturer: ETC-unknow

Cermetek Microelectronics, Inc.
Asynchronous
Asynchronous
Range
Asynchronous Format
Telephone Line Interface
Modulation
Self
Generator
Transmit
Frequencies
V.22, 212A
Bell 103
2003 Cermetek Microelectronics, Inc.
Parameter
Test
V.22
Pattern
Carrier
Speed
bis,
Table 7. CH1786 System Data Mode Compatibility Specifications.
2400, 1200 600 bps character
asynchronous.
0-300 bps asynchronous
TXD may differ +1%, -2.5%
from modem output. Offsets
will be corrected by adding/
deleting stop bits.
8,9,10 bits, including start,
stop, parity.
Two-wire
public switched network. On-
chip hybrid and billing delay
timers.
V.22 bis, 16 point QAM at 600
baud. V.22 and 212A, 4 point
DPSK at 600 baud.
Binary phase coherent FSK.
Alternate ‘ones’ and ‘zeros’
and error detector, to be used
along with most loopbacks. A
number
errors detected is sent to DTE.
Originate 1200Hz ± .01%
Answer
Originate ’space’
.01%
Originate ‘mark’
.01%
Answer
.01%
Answer
.01%
Specification
indicating
2400Hz ± .01%
‘mark’
‘space’ 2020Hz ±
full
duplex
1070Hz ±
1270Hz ±
2225Hz ±
the
Page 14
over
103
bit
Receive Carrier
Frequencies
V.22 bis, V.22,
212A
Bell 103
Receiver
Sensitivity
Billing Delay
Hysteresis
Line
Equalization
Diagnostic
Available
Call Progress
Tones Detected
Computer
Interface
Parameter
CH1786 Family of Ultra Small 2400bps Modems
Document No. 607-0004 Revision L1 (06/03)
Originate 2400Hz ± 7Hz
Answer
Answer
7Hz
Answer
7Hz
Originate ’space’
7Hz
Originate ‘mark’
7Hz
OFF to ON threshold –43
dBm
ON to OFF threshold –48
dBm
2.0 to 3.0 seconds (T
2 dB minimum
Fixed
equalization,
Adaptive
PSK/QAM, receive.
Local analog loopback.
Local analog loopback.
Remote digital loopback.
Request
loopback.
Local
modem with self-test.
With speaker or quiet screen
messages (No dial tone,
busy, ring-back, modem
answer tone and voice).
IBX PC/XT/AT bus
compatible with an
8250/16450/16550A UART
as a serial controller.
Specification
interface
1200Hz ± 7Hz
‘mark’
‘space’ 2020Hz ±
remote
equalizer
compromise
1070Hz ±
2225Hz ±
1270Hz ±
loopback
a
transmit.
=25°C)
digital
for