Specifications

18 AT-9900 Series Switch
C613-03084-00 REV A
RS-232 Terminal Port (ASYN0)
This section introduces the switch’s RS-232 Terminal Port (ASYN0), including
its pin assignment and purpose.
The RS-232 ASYN0 Terminal Port is used to connect the switch to a
management device for initial configuration and switch management tasks.
This allows the switch’s software to be accessed from a terminal, or a PC
running terminal emulation software. You can also use ASYN0 to establish a
network connection from a remote site using SLIP and a modem.
ASYN0 has an RJ-45 socket with an industry recognised pinout. This requires
the use of a straight-through RJ-45 cable with an RJ-45 DB9 connector when the
switch is connected to a terminal or PC. The socket is wired as a DTE and the
pin roles are shown in Figure 1-5 on page 18 and listed in Table 1-4 on page 18.
For more information on suitable cables to use with ASYN0 see “Useful
Cables” on page 19.
Figure 1-5: RS-232 Terminal Port Pin Numbers
Table 1-4: Internal DTE pin roles
Pin Role
1RTS
2DTR
1
1. DTR and DSR are connected together but have no other internal connection.
3TXD
4GND
5GND
6RXD
7DSR
1
8CTS
18
RJPIN1