Specifications
Table Of Contents
- AR Router Hardware Reference
- Copyright
- Contents
- Introduction
- Models Covered By This Reference
- Where To Find More Information
- Using Windows Terminal and Windows Hyperterminal
- Router Start-up
- Online Documentation
- AT-TFTP Server
- Memory
- AR300 Series Routers
- AR400 Series Routers
- AR700 Series Routers
- AT-RPS 740
- Mini Accelerator Cards (MACs)
- PCI Accelerator Cards (PACs)
- Flash Memory
- Interfaces
- Test Facility
- Cables And Loopback Plugs
- PICs and NSMs
- Restricted Procedures
- Contacting Us
Hardware Reference 71
C613-03058-00 REV A
Ethernet Dual 10BASE-T/AUI Interfaces
The AT-AR022 ETH PIC has a dual 10BASE-T/AUI Ethernet interface. Only
one Ethernet interface type can be active at any one time. The PIC auto-senses
which Ethernet interface type is in use.
The AUI interface is able to supply the required +12 Volts to attached transceivers. The
+12 Volts is fused to prevent any transceiver faults from causing problems with the
router. See the description of the appropriate router series in this Reference for the
location of the fuse. The fuse must be a 500 mA type. If the fuse fails, LEDs on any
attached transceiver will not be lit. The AUI cable should be checked for continuity
problems if the fuse blows.
Basic Rate ISDN Interfaces
Basic Rate ISDN (BRI) interfaces support two 64K B channels and one D
channel. On some routers and expansion cards the operational mode of the BRI
ISDN interface (TE or NT) is determined by jumpers mounted on the CPU or
expansion card. Other models and expansion cards—in particular those with U
interfaces—only support TE mode.
See the description of the relevant router model in this Reference for details of
the locations and names of jumpers. See the Integrated Services Digital Network
(ISDN) chapter of your router’s Software Reference for a detailed description
of the two operational modes. The router should be configured as a TE for
normal operation.
The jumpers used to determine interface termination are normally removed as
the building wiring will provide the correct termination for an ISDN TE-to-NT
circuit. When the BRI is connected in a point-to-point configuration, the
jumpers may need to be installed to terminate the line pairs with internal 100Ω
resistors.
See the description of the relevant router series (in this Reference) for details of
the locations and names of jumpers. The Integrated Services Digital Network
(ISDN) chapter of your router’s Software Reference also has additional
information. The BRI interface pin out is shown in Tabl e30 on page 71.
If you are unsure of whether to terminate the line or not, contact your ISDN service
provider or your authorised Allied Telesyn distributor or reseller.
Table 30: Pinout of the Basic Rate ISDN interface .
Pin S/T Interface Functions U Interface Functions
1- -
2- -
3TX+ -
4 RX+ positive (+)
5RX- negative (-)
6TX- -
7- -
8- -