Allied Telesis AT-AR020 PRI E1/T1 Application guide

Port Interface Card
Hardware Reference
AT-AR020 PRI E1/T1
AT-AR021 (S) BRI- S/T
AT-AR021 (U) BRI-U
AT-AR022 ETH
AT-AR023 SYN
AT-AR024 ASYN4
AT-AR026 4ETH
AT-AR027 VoIP-FXS

Port Interface Card Hardware Reference
AT-AR020 PRI E1/T1
AT-AR021 (S) BRI-S/T
AT-AR021 (U) BRI-U
AT-AR022 ETH
AT-AR023 SYN
AT-AR024 ASYN4
AT-AR026 4ETH
AT-AR027 VoIP-FXS
Download the complete document set from
www.alliedtelesis.com/support/software

Port Interface Card Hardware Reference
Document Number C613-03023-00 REV N.
© 2007 Allied Telesis, Inc. All rights reserved. No part of this publication may
be reproduced without prior written permission from Allied Telesis, Inc.
Allied Telesis, Inc. reserves the right to change specifications and other
information in this document without prior written notice. The information
provided herein is subject to change without notice. In no event shall Allied
Telesis, Inc. be liable for any incidental, special, indirect, or consequential
damages whatsoever, including but not limited to lost profits, arising out of or
related to this manual or the information contained herein, even if Allied
Telesis, Inc. has been advised of, known, or should have known, the possibility
of such damages.
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United States and elsewhere of Allied Telesis, Inc. Adobe, Acrobat, and Reader
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products mentioned herein may be trademarks of their respective companies.

Contents
Devices Covered By This Document ................................................................... 4
Compatible Switches and Routers ..................................................................... 4
Hardware Overview .......................................................................................... 5
Common Features ...................................................................................... 5
AT-AR020 PRI E1/T1 PIC ............................................................................. 6
AT-AR021(S) BRI-S/T PIC ............................................................................. 8
AT-AR021(U) BRI-U PIC ............................................................................. 10
AT-AR022 ETH PIC .................................................................................... 11
AT-AR023 SYN PIC ................................................................................... 12
AT-AR024 ASYN4 PIC ............................................................................... 13
AT-AR026 4ETH PIC .................................................................................. 14
AT-AR027 VoIP-FXS PIC ............................................................................ 17
PIC Interfaces .................................................................................................. 19
Asynchronous Interface ............................................................................ 19
Synchronous Interface .............................................................................. 20
Ethernet Interface ..................................................................................... 20
Basic Rate ISDN Interface .......................................................................... 20
Primary Rate ISDN Interface ...................................................................... 21
VoIP FXS Interface .................................................................................... 22
Cables and Loopback Plugs for PICs ................................................................ 23
Transition Cables for the AT-AR023 PIC ..................................................... 23
ISDN Interface Cables ............................................................................... 31
BT Adaptor Cable for the AT-AR027 PIC ................................................... 32
Terminal and Modem Cables .................................................................... 32
Ethernet Transceivers and AUI Cables ....................................................... 34
Loopback Plugs for Testing Interfaces ....................................................... 35
Hot Swapping the AR040 NSM with PICs Installed .......................................... 38
Behaviour of Hot Swapped Interfaces ....................................................... 38
PIC Testing and Verification ............................................................................. 40
Test Facility ..................................................................................................... 42
Troubleshooting .............................................................................................. 44
Obtaining Documentation and Resources ........................................................ 45

4Port Interface Card
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Devices Covered By This Document
This Hardware Reference contains information on the following Port Interface
Cards (PICs):
■AT-AR020 PRI E1/T1, a single ISDN Primary Rate E1/T1 interface
■AT-AR021 (S) BRI- S/T, a single ISDN Basic Rate S/T interface
■AT-AR021 (U) BRI-U, a single ISDN Basic Rate U interface
■AT-AR022 ETH, a dual Ethernet 10BASE-T/AUI port
■AT-AR023 SYN, a single 2Mbps synchronous interface
■AT-AR024 ASYN4, four asynchronous ports
■AT-AR026 4ETH, four Ethernet 10BASE-T ports
■AT-AR027 VoIP-FXS, two Foreign Exchange Voice over IP ports
You can download the complete document set for PICs, and for your switch or
router, from www.alliedtelesis.com/support/software. For more information
about the document set and other resources, see “Obtaining Documentation
and Resources” on page 47.
Compatible Switches and Routers
You can install a PIC into a PIC bay on the base unit of your switch or router, or
into a PIC bay on an AT-AR040 NSM (Network Service Module) installed in your
switch or router.
The following table shows which PICs are appropriate for different expansion
bays and models of switch and router.
The AT-AR021(S) V3 hardware revision, identified by the label “AR021v3” on
the board, requires a switch or router running AlliedWare®Operating System
version 2.9.1-13 or later.
Table 1: Compatible switches and routers for Port Interface Cards (PICs)
This expansion bay ... Accepts ...
PIC bays in the AR415S, AR440S, AR441S,
AR442S, AR725, and AR745 router
All PICs.
PIC bays in the AR750S, AR750S-DP, and
AR770S router
AT-AR020, AT-AR021, AT-AR023, and
AT-AR024.
AT-AR040 NSM in the AR745 router,
Rapier 16fi and Rapier 24i switch
All PICs except AT-AR022 and
AT-AR026.
AT-AR040 NSM in the Rapier 48w switch AT-AR020, AT-AR021v3, and AT-AR024.

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Hardware Overview
This section provides an overview of the hardware features of PICs. PICs
provide a cost effective and flexible mechanism for adding new or additional
network interfaces to your switch or router. By adding or changing PICs,
network interface capabilities can be upgraded without replacing the switch or
router. A PIC can provide additional network interfaces, or can be replaced
with a different PIC to provide alternative interface types.
Hardware descriptions for your switch or router, Uplink Modules, and
Network Service Modules (NSMs) can be found in their respective Hardware
References. These documents can be downloaded from
www.alliedtelesis.com/support/software.
Common Features
The following hardware features are common to all PIC models.
Environmental
conditions
■Operating temperature range: 0 ºC to 40 ºC (32 ºF to 104 ºF)
■Storage temperature range: -25 ºC to 70 ºC (-13 ºF to 158 ºF)
■Relative humidity range: 5% to 95% non-condensing
Regulatory
Standards
■Emissions: EN55022 class A, FCC class A, and VCCI class A,
AS/NZS CISPR22
■Immunity: EN55024
■Safety: UL60950-1, CAN/CSA-C22.2 No. 60950-1-03, EN60950-1,
AS/NZS60950.1

6Port Interface Card
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AT-AR020 PRI E1/T1 PIC
The AT-AR020 PRI E1/T1 PIC provides a single G.703/Primary Rate ISDN
WAN port with an RJ-45 connector.
The front panel of the AT-AR020 PRI E1/T1 PIC is shown in Figure 1, and the
functions of the LEDs are listed in Table 1.
Figure 1: AT-AR020 PRI E1/T1 PIC
The AT-AR020 supports both E1 and T1 operation. A jumper selects the
required mode. A second jumper selects NT (Network Terminator) or TE
(Terminal Equipment) mode, and the current mode is displayed by the NT LED.
This jumper is factory set to TE mode for normal operation and should not be
changed without contacting your ISDN service provider, or authorised Allied
Telesis distributor or reseller. Earlier versions of this card also have a J3 jumper.
If present, this jumper must be installed for E1 mode and removed for T1
mode.
Jumper locations are shown in Figure 2 on page 7, and jumper functions are
listed in Table 2 on page 7.
Table 1: AT-AR020 PRI E1/T1 PIC LED functions
LED Function
D Data [ISDN mode only] Lit when HDLC packets are being exchanged between
the switch or router and the ISDN switch over the D (signalling) channel.
B Data Lit when HDLC packets are being exchanged between the switch or
router and another end system device (normally another switch or router)
over any of the B (data) channels.
Active Lit whenever operational (i.e., no RAI or AIS) frames are being received.
NT [ISDN mode only] Lit when the PRI1 is operating in NT mode. This LED
should not be lit during normal operation.
Active
LEDs
PRI E1/T1 (RJ45 connector)
D Data
B Data
LEDs
AR020FP
PRI E1/T1
NT

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Figure 2: Location of jumpers on the AT-AR020 PRI E1/T1 PIC board
Warning Do not attempt to install or remove the PIC, or change any jumpers on
the PIC, while the switch or router is connected to a power supply or a live
network. Disconnect the mains power supply, any redundant power supply, and
any cable attached to the WAN port of the PIC. Dangerous voltages may be
present on some parts of the PIC board, even if the switch or router is powered off.
Table 2: Functions of jumpers on the AT-AR020 PRI E1/T1 PIC board
Jumper Function Default
J1 Selects ISDN NT mode (installed) or TE mode (not installed). Not installed.
J2 Selects T1 mode (installed) or E1 mode (not installed). Installed.
J3 Selects E1 mode (installed) or T1 mode (not installed).
Only present on earlier versions of the PIC.
-
AR020C
S/N
PIC CONNECTOR
LED
D Data
B Data
LED
Active
NT
RJ45
J2 (E1/T1)
J1 (NT/TE)
PRI

8Port Interface Card
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AT-AR021(S) BRI-S/T PIC
The AT-AR021(S) BRI-S/T PIC provides a single Basic Rate ISDN S/T WAN
port. The BRI port has an RJ-45 connector.
The front panel of the AT-AR021(S) PIC is shown in Figure 3 and the functions
of the LEDs are listed in Table 3.
Figure 3: AT-AR021(S) BRI-S/T PIC
In North America, the S/T interface must be supplied from a UL listed
network terminating device such as an NT1, and the cable length between the
AR021(S) PIC and the NT1 device must be less than 1000 metres.
Two user-configurable jumpers provide 100Ωline termination. Jumper
locations on the AT-AR021(S) V3 hardware revision are shown in Figure 4 on
page 9, and jumper functions are listed in Table 4 on page 9. The older V2
hardware revision of the AT-AR021(S) has the same jumpers and functions, but
the positions of the jumpers are reversed. The hardware revision is identified
by the label “AR021 V2” or “AR021v3” printed on the board.
The V3 hardware revision supports TE mode only. The V2 hardware revision
supports both TE and NT mode. Jumper J4, when installed, selects NT mode.
The PIC should be configured as a TE for normal operation.
Table 3: AT-AR021(S) BRI-S/T PIC LED functions
LED Function
B1, B2 For on-demand ISDN, lit when there is a call up over the respective B
channel and flashing when data is being exchanged.
For permanent circuits, lit when HDLC packets are being exchanged
between the switch or router and another TE end system device (normally
another switch or router) over the respective B (data) channel.
Active Lit when the BRI has successfully completed the exchange of INFO 1 and
INFO 2 signals, and INFO 3 and INFO 4 signals are present on the link. This
means that the ISDN interface is correctly connected to a working NT
device.
D Lit when HDLC packets are being exchanged between the switch or
router and the ISDN switch over the D (signalling) channel.
BRI S/T
Active
D
LEDs
ISDN BRI S/T port (RJ45 connector)
B1
B2
LEDs
AR021SFP

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Figure 4: Location of jumpers on the AT-AR021(S) BRI-S/T PIC board
You should install the termination jumpers (terminate Rx and Tx) if:
■termination is not provided by the building wiring, and
■the device is the only TE device on a Point-to-Point link between the NT
and the TE, or the device is the last device on an S/T bus
You should remove the termination jumpers (not terminate Rx and Tx) if:
■termination is provided by the building wiring, or
■the device is one of a number of devices on an S/T bus, and is not the last
device on an S/T bus
If you are unsure of whether to terminate the line or not, contact your ISDN
service provider or your authorised Allied Telesis distributor or reseller.
Warning
Do not attempt to install or remove the PIC, or change any jumpers on
the PIC, while the switch or router is connected to a power supply or a live
network. Disconnect the mains power supply, any redundant power supply, and
any cable attached to the WAN port of the PIC. Dangerous voltages may be
present on some parts of the PIC board, even if the switch or router is powered off.
Table 4: Functions of jumpers on the AT-AR021(S) BRI-S/T PIC board
Jumper Function Default
J1 100Ωtermination for TX. Not installed.
J2 100Ωtermination for RX. Not installed.
J4 ISDN NT mode (installed) or TE mode (not installed).
Only present on V2 hardware revision of PIC.
Not installed.
PIC CONNECTOR
ISDN RX
TERMINATION ISDN TX TERMINATION
J2 J1
RJ45
BRI
LED
LED
Active
D
B1
B2
AR021SC
NT MODE (V2 REV ONLY)
J4

10 Port Interface Card
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AT-AR021(U) BRI-U PIC
The AT-AR021(U) BRI-U PIC provides a single Basic Rate ISDN U Interface
WAN port. The BRI port has an RJ-45 connector.
The front panel of the AT-AR021(U) PIC is shown in Figure 5, and the functions
of the LEDs are listed in Table 5.
Figure 5: AT-AR021(U) BRI-U PIC
There are no user-configurable jumpers on the AT-AR021(U) BRI-U PIC.
Warning Do not attempt to install or remove the PIC while the switch or router
is connected to a power supply or a live network. Disconnect the mains power
supply, any redundant power supply, and any cable attached to the WAN port
of the PIC. Dangerous voltages may be present on some parts of the PIC board,
even if the switch or router is powered off.
Table 5: AT-AR021(U) BRI-U PIC LED functions
LED Function
B1, B2 Lit when HDLC packets are being exchanged between the switch or
router and another TE end system device (normally another switch or
router) over the respective B (data) channel.
For ISDN, lit when there is a call up over the respective B channel and
flashing when data is being exchanged.
Active Lit when the U interface is in the Activated state (i.e., it is fully operational
at layer 1).
D Lit when HDLC packets are being exchanged between the switch or
router and the ISDN switch over the D (signalling) channel.
AR021UFP
Active
LEDs
ISDN BRI U interface (RJ45 connector)
BRI U
D
B1
B2

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AT-AR022 ETH PIC
The AT-AR022 ETH PIC provides a dual Ethernet 10BASE-T/AUI port. Only
one interface type can be active at any one time and the PIC automatically
senses which interface is in use. The 10BASE-T interface uses an RJ-45
connector and the AUI interface uses a DB15 connector.
AT-AR022 ETH PICs are not recommended for use in AT-AR040 NSM PIC
bays because performance of these interfaces is likely to be reduced and packet
loss may occur.
The front panel of the AT-AR022 ETH PIC is shown in Figure 6, and the
functions of the LEDs are listed in Table 6.
Figure 6: AT-AR022 ETH PIC
There are no user-configurable jumpers on the AT-AR022 ETH PIC.
Table 6: AT-AR022 ETH PIC LED functions
LED Function
Link Lit when the Ethernet interface is connected to a device (e.g. a hub) which is
generating link pulses.
Data Lit when data is being transmitted or received over the Ethernet interface.
AR022FP
Ethernet 10BASET port
(RJ45 connector)
Ethernet AUI port
(DB15 connector)
LEDs
Data
ETH
Link

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AT-AR023 SYN PIC
The AT-AR023 SYN PIC provides a single synchronous port operating at
speeds up to 2Mbps. The synchronous port has a 50-way AMPLIMITE
universal connector which supports RS-232/V.28, V.35 and X.21 interface
standards in DTE and DCE modes.
A transition cable is required to convert the AMPLIMITE connector to the
correct physical interface. The switch or router does not need to be rebooted to
change the interface type.
The front panel of the AT-AR023 SYN PIC is shown in Figure 7, and the
functions of the LEDs are listed in Table 7.
Figure 7: AT-AR023 SYN PIC
There are no user-configurable jumpers on the AT-AR023 SYN PIC.
Table 7: AT-AR023 SYN PIC LED functions
LED Function
Tx Lit when data is being transmitted over the synchronous interface.
Rx Lit when data is being received on the synchronous interface.
SYN
Synchronous port (AMPLIMITE 50-way connector)
Tx
Rx
LEDs
AR023FP

Hardware Reference 13
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AT-AR024 ASYN4 PIC
The AT-AR024 ASYN4 PIC provides four asynchronous RS-232 ports with
RJ-45 connectors for use up to 115 Kbps.
The front panel of the AT-AR024 ASYN4 PIC is shown in Figure 8. The ASYN4
PIC does not have LEDs.
Figure 8: AT-AR024 ASYN4 PIC
There are no user-configurable jumpers on the AT-AR024 ASYN4 PIC.
Asynchronous ports (RJ45 connector)
AR024FP
ASYN
30

14 Port Interface Card
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AT-AR026 4ETH PIC
The AT-AR026 4ETH PIC provides four 10BASE-T/100 BASE-TX auto-
negotiating ports. The ports have RJ-45 connectors and provide wire speed
unmanaged layer 2 switching.
AT-AR026 4ETH PICs are not recommended for use in AT-AR040 NSM PIC
bays because performance of these interfaces is likely to be reduced and packet
loss may occur.
The front panel of the AT-AR026 4ETH PIC is shown in Figure 9, and the
functions of the LEDs are listed in Table 8 on page 14.
Figure 9: AT-AR026 4ETH PIC
The AT-AR026 PIC includes a switch chip that switches independently of the
switch, router, or NSM that the PIC is installed in. The show interface
command will show each correctly installed AT-AR026 as a single interface.
The 10/100 “front side” Ethernet ports will not be shown.
AT-AR026 features include:
■Five integrated switch ports with physical layer transceivers—four 10/100
Ethernet switch ports, and one fixed 10 Mbps port acting as the PIC to base
unit connector
■128 kbytes of frame buffering SRAM
■1.4 Gbps high performance memory bandwidth
■10BASE-T and 100BASE-TX modes of operation
■LED indicators for link, activity, full/half duplex, and port speed
■Hardware based 10/100, full/half duplex, flow control, and auto-
negotiation
Table 8: AT-AR026 4ETH PIC LED functions (two LEDs per port)
LED Function
Left Lit when the port is operating at 100Mbps and full duplex.
Right Lit when a link has been established. Flashing when data is being transmitted
through the port.
10BASE-T/100BASE-TX Ethernet ports
(RJ45 connectors)
AR026FP
41
LEDs
10/100 ETH

Hardware Reference 15
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■Individual port forced full duplex and 100BASE-TX modes when auto-
negotiation is disabled
■Wire speed reception and transmission
■Integrated address look-up engine, supporting 1K absolute MAC
addresses
■Automatic address learning, address aging, and address migration
■Broadcast storm protection
■Full duplex IEEE 802.3x flow control
■Half duplex back pressure flow control
■MDI/MDI-X auto cross over support
Some features, such as autonegotiation, buffer size, and MAC address aging,
are configured by adding or removing links on the PIC board. Figure 10 shows
the location of the configurable links on the board, and Table 9 on page 16 lists
the configurable features, their respective links, and their default settings.
Figure 10: Location of user configurable links on the AT-AR026 4ETH PIC
Up = 10kΩ link between pads 1 and 2
Down = 1kΩ link between pads 2 and 3
Floating = No links
All configurable links use 603 resistors
1 2 3
Pads
Ethernet ports
PIC connector
Link Detail
AR026C
Configurable links
Link Options
Links 22, 31, 40, and MRXD 3 are fixed and
cannot be configured
Link

16 Port Interface Card
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Caution Links 22, 31, 40, and MRXD 3 are fixed and should not be changed.
Changing these links will cause the PIC to cease functioning.
The AT-AR026 PIC does not support the AlliedWare operating system’s
diagnostic or Test Facility features.
Table 9: Configurable links on the AT-AR026 4ETH PIC
Function Link Up1Down2Floating3Default
Flow control on all ports 13 Flow control No flow control N/A Up
10BASE-T4, 100BASE-TX4,
or auto-negotiate on port 1
41 100BASE-TX 10BASE-T Auto-negotiate Floating
10BASE-T5, 100BASE-TX5,
or auto-negotiate on port 2
42 100BASE-TX 10BASE-T Auto-negotiate Floating
10BASE-T6, 100BASE-TX6,
or auto-negotiate on port 3
43 100BASE-TX 10BASE-T Auto-negotiate Floating
10BASE-T7, 100BASE-TX7,
or auto-negotiate on port 4
30 100BASE-TX 10BASE-T Auto-negotiate Floating
Full duplex4, half duplex4,
or auto-negotiate on port 1
50 Full duplex Half duplex Auto-negotiate Floating
Full duplex5, half duplex5,
or auto-negotiate on port 2
51 Full duplex Half duplex Auto-negotiate Floating
Full duplex6, half duplex6,
or auto-negotiate on port 3
52 Full duplex Half duplex Auto-negotiate Floating
Full duplex7, half duplex7,
or auto-negotiate on port 4
53 Full duplex Half duplex Auto-negotiate Floating
Back-off mode in half duplex 20 Aggressive Standard N/A Up
Back pressure in half duplex 21 Enabled Disabled N/A Up
MAC address ageing 23 Age out addresses
after 5 minutes
Don’t age out
addresses
N/A Up
Limit on broadcast frames 32 25% of frames No limit N/A Up
Drop packets after collisions 33 Don’t drop packets Drop packets after
16 collisions
N/A Down
Auto-negotiation on port 1 MCOL Disable Enable N/A Down
Auto-negotiation on port 2 MRXD 0 Disable Enable N/A Down
Auto-negotiation on port 3 MRXD 1 Disable Enable N/A Down
Auto-negotiation on port 4 MRXD 2 Disable Enable N/A Down
205 buffers per port (max) 10 & 11 NA 1k (link 10),
1k (link 11)
N/A N/A
512 buffers per port (max) 10 & 11 10k (link 11) 1k (link 10) N/A N/A
768 buffers per port (max) 10 & 11 10k (link 10) 1k (link11) N/A N/A
512 buffers per port
(adaptive)
10 & 11 10k (link 10),
10k (link 11)
NA N/A Up (link 10)
Up (link 11)
1. Up = 10kΩlink between pads 1 and 2.
2. Down = 1kΩlink between pads 2 and 3
3. Floating = no link.
4. Requires auto-negotiation on port 1 to be disabled using link MCOL.
5. Requires auto-negotiation on port 2 to be disabled using link MRXD 0.
6. Requires auto-negotiation on port 3 to be disabled using link MRXD 1.
7. Requires auto-negotiation on port 4 to be disabled using link MRXD 2.

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AT-AR027 VoIP-FXS PIC
The AT-AR027 VoIP-FXS PIC provides two Foreign Exchange Subscriber (FXS)
ports. The ports use RJ-11 connectors and can be connected to standard analog
telephony equipment such as telephones, fax machines and modems. The FXS
interface supplies ring, voltage and dial tone.
The front panel of the AT-AR027 VoIP-FXS PIC is shown in Figure 11, and
functions of the LEDs are listed in Table 10 on page 17.
Figure 11: AT-AR027 VoIP-FXS PIC
AT-AR027 features include:
■Settable ring wave form
■Settable tone generation
■Settable port gain/attenuation for transmit and receive on each port
■600r, 600c, 900c, Cplx and Cplx2 port impedance.
■Frame buffer management
Table 10: AT-AR027 VoIP-FXS PIC LED functions
LED State Function
Off Hook/Ring Off The port is on-hook.
Green The port is off-hook.
Flashing An incoming call is present on the port.
PIC Reg Off The PIC is not registered with a gatekeeper and external
phone calls cannot be made.
Flashing The PIC is registered with a gatekeeper or gatekeeper has
been set to “None”. External calls can only be made if the
PIC is registered with a gatekeeper.
PIC Error Off The PIC is okay.
Green An internal error has occurred. Reset the PIC using the
reset voip command.
AR027FP
10
FXS
OFF HOOK
/RING
PIC REG
OFF HOOK
/RING
PIC ERROR
Two FXS VoIP Ports
(RJ-11 connectors)
Four LEDs

18 Port Interface Card
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■Voice activation and silence detection
■Compatible with H.233, Session Initiation Protocol (SIP) and Media
Gateway Control Protocol (MGCP)
You can install a maximum of four AT-AR027 PICs in an AR745 router fitted
with an AT-AR040 NSM.
For more information on VoIP protocols and how to configure them, see the
Voice Over IP (VoIP) chapter of the AlliedWare®Operating System Software
Reference for your switch or router. You can download this document from
www.alliedtelesis.com/support/software.

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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 11 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 11: 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.