規格與說明
T-288C/NC Leased Line Modem
SPECIFICATIONS
Compatibility
V.34+ 33.6/31.2Kbps 4DTCM
V.34 28.8/26.4/24/21.6/19.2/16.8/14.4/ 12/9.6/7.2/
4.8/2.4Kbps 4DTCM
V.33 14400/12000/9600/7200bps TCM, 4800bps QAM
V.32bis 14400/12000/7200bps TCM
V.32 9600bps TCM, 9600/4800bps QAM
V.29 9600/7200bps QAM, 4800bps DPSK
V.27bis 4800/2400bps DPSK
V.26 2400/1200bps DPSK
V.22bis 2400bps QAM
V.22/Bell 212A 1200bps DPSK
V.23 1200/75, 600/75bps FSK
V.21/Bell 103 300bps FSK
Data Format
Synchronous or Asynchronous
Total bit length: 8, 9, 10, 11
Data Speed
Asynchronous
75/300/600/1200/2400/4800/7200/9600/12000/
14400/16800/19200/21600/24000/26400/28800/
31200/33600/38400/57600/76800/115200bps
Synchronous
1200/2400/4800/7200/9600/12000/14400/16800/
19200/21600/24000/26400/28800/31200/33600bps
DTE Interface
EIA RS-232C, ITU-T V.24/V.28
Line Requirement
Dial line, 2/4 wire leased line
Transmit Level
Dial line: 0 to -15dBm for where allowed, or fixed -10dBm
Leased line: -6 to -31dBm for V.34
0 to -31dBm for other V-series
Receive Dynamic Range
+3 to -26, +3 to -40, -6 to -33, -6 to -43dBm
Equalization
Automatic adaptive EQ
Compromise EQ: M1040 or cable
Call Progress Monitoring
Dial tone, Ring, Ringback, Busy and Backup dial
Line Status Monitoring
TX level, RX level, S/N ratio, Delay, Freq. offset, Far-end
echo freq. offset, Near-end echo, Far-end echo, Retrain
count, Tx Baud Rate, Rx Baud Rate, Tx Carrier, Rx Carrier,
Tx Power Back-off level
Memory
A nonvolatile memory for storing 10 sets of user profile and
10 telephone numbers with 20 characters, the 10 sets of
factory default are stored in ROM
Line Interface
RJ-11 for Dial Line, JM8 for Leased Line
Transmit Clock
Internal, Loopback, External clock
Dialing Command
Extended AT and V.25bis command set
Dialing Type
Tone/Pulse dialing
Flow Control
RTS/CTS, XON/XOFF, CTS only, ENQ/ACK
Power
AC Source: 90 ∼ 265V, Autorange, 47 ∼ 63 Hz
DC Source: -36 ∼ -72V for rack option
Dual redundant power unit for rack option