Specifications

Hardware Reference 19
C613-03023-00 REV P
PIC Interfaces
This section provides detailed information on the physical and operational
characteristics of the following PIC interfaces:
■ Asynchronous Interface
■ Synchronous Interface
■ Ethernet Interface
■ Basic Rate ISDN Interface
■ Primary Rate ISDN Interface
■ VoIP FXS Interface
Asynchronous Interface
The AT-AR024 ASYN4 PIC provides four RS-232 asynchronous interfaces
using RJ-45 connectors. Table 12 shows the pinout of the asynchronous
interfaces.
A range of speeds are selectable using the set asyn command. For more
information, see the Interfaces chapter of the AlliedWare
®
Operating System
Software Reference for your switch or router.
Not all signals need to be connected. In particular, DCD and CTS are not
required unless the interface has been specifically set up to use them. For more
information, see the Line Printer Daemon (LPD) and Stream Printing chapters of
the AlliedWare
®
Operating System Software Reference for your switch or router. A
typical terminal connection will only require RXD, TXD and GND, but refer to
the equipment manual for the connected device for more specific data.
If LPD-based printer ports are required, then the switch or router may expect to
see the DTR signal from the printer connected to the DCD pin of the switch.
This is used to detect that the printer is powered on and online. This prevents
print jobs being sent to a disconnected printer and lost. For more information,
see the Line Printer Daemon (LPD) chapter of the AlliedWare
®
Operating System
Software Reference for your switch or router.
Table 12: Pinout of the RJ-45 connectors on the AT-AR024 ASYN4 PIC
Pin* Function Signal Direction
1 RING Input to PIC
2 DCD Input to PIC
3 DTR Output from PIC
4GND
5 RXD Input to PIC
6 TXD Output from PIC
7 CTS Input to PIC
8 RTS Output from PIC
*Pins are numbered from left to right.