Pic Interfaces; Asynchronous Interface; Synchronous Interface - Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual

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PIC Interfaces

This section provides detailed information on the physical and operational
characteristics of PIC interfaces.

Asynchronous Interface

The AT-AR024 ASYN4 PIC provides an asynchronous interface with four
ports. The interface follows the RS-232 standard and uses RJ-45 connectors.
Table 11 lists the port pin assignments.
Table 11: Pinout of the RJ-45 connectors on the AT-AR024 ASYN4 PIC
Pin* Function
1 RING
2 DCD
3 DTR
4 GND
5 RXD
6 TXD
7 CTS
8 RTS
*Pins are numbered from left to right.
A range of speeds is selectable using the set port command if using a router, or
the set asyn command if using a switch. More information on these commands
can be found in the Interfaces chapter of the Software Reference for your switch
or router.
Not all signals need to be connected. In particular, both DCD and CTS are not
required unless the interface has been specifically set up to use them. The
Terminal Server and Printer Server chapters of the Software Reference or
Reference Manual for your switch or router have more details. 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 both the fact that the printer is 'online' and that it is
'powered-on'. This prevents print jobs being sent to a disconnected printer and
lost. The Printer Server chapter of the Software Reference or Reference Manual
for your switch or router has more information.

Synchronous Interface

The AT-AR023 SYN PIC provides a synchronous interface with a single
AMPLIMITE 50-way port. The AMPLIMITE port is wired as a universal
connector for RS-232/V.28, V.35 and X.21 interface standards in both DTE and
DCE modes. A transition cable is required to convert the AMPLIMITE to the
correct physical interface for the standard required (e.g., DB15 for X.21). The
transition cable can be ordered from your supplier, or you can construct your
own cable.
Signal Direction
Input to PIC
Input to PIC
Output from PIC
Input to PIC
Output from PIC
Input to PIC
Output from PIC
Port Interface Card
C613-03023-00 REV J