Huawei Technologies Proprietary
4-14
Description
Attribute
Synchronous Asynchronous
Service
DDN leased line backup
Terminal access
Backup
Modem dialup
Backup
Asynchronous lease
line
terminal access
Protocol
PPP
MP
LAPB
HDLC
X.25
Frame Relay
PPP
SLIP
MP
z Synchronous/asynchronous mode
Synchronous/Asynchronous serial interface can work in either synchronous or
asynchronous mode. Different signaling standards are supported in these two modes.
V.35, V.24 (RS232), RS449, X.21, and EIA-530 support synchronous operating mode,
while V.24 (RS232) supports asynchronous operating mode. The maximum
transmission distance and baud rate of the signal vary with the operating mode.
Table 4-10 Transmission rate and transmission distance of V.24 (RS232)/V.35 cable
V.24 (RS232) V.35
Baud rate (bps)
Maximum
transmission
distance (m)
Baud rate
(bps)
Maximum transmission
distance (m)
2400 60 2400 1250
4800 60 4800 625
9600 30 9600 312
19200 30 19200 156
38400 20 38400 78
64000 20 56000 60
115200 10 64000 50
–– –– 2048000 30
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