3Com Router 5000 Family
Installation Guide
Chapter 4 Installation of the Router
3Com Corporation
4-13
Description
Attribute
Synchronous
Asynchronous
Protocol
PPP
MP
LAPB
HDLC
X.25
Frame Relay
PPP
SLIP
MP
Note:
When using the DB50 connector, you cannot connect RS530 DCE cable.
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 and V.24 (RS232) support synchronous operating mode, while V.24 (RS232),
support the asynchronous operating mode. The maximum transmission distance and
baud rate of the signal vary with the operating mode.
Table 4-7
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