Allied Telesis AR400 SERIES Software Release 2.7.1 - Manual (Page 85)

Physical and Layer 2 Interfaces 85
Software Release 2.7.1
C613-02021-00 REV F
Integrated Services Digital Network
(ISDN) (models with PIC bay)
To use ISDN connections you need to install the appropriate Port Interface
Card (PIC) in the router’s PIC bay. Either install an ISDN Basic Rate ISDN (BRI)
or Primary Rate ISDN (PRI) PIC. Depending on the PIC installed, the router
supports the following types of ISDN connections:
■ Basic Rate ISDN (U)
■ Basic Rate ISDN (S/T)
■ Primary Rate ISDN
BRI Versus PRI
LAPD is the Link Access Protocol for the ISDN D channel, as defined by ITU-T
Recommendation Q.921. The major difference between Basic and Primary Rate
Interfaces as far as LAPD is concerned is that BRI S/T interfaces use a bus
configuration whereas PRI interfaces use a point-to-point configuration.
For more information about ISDN, see the Integrated Services Digital Network
(ISDN) chapter in the Software Reference.
Configuring the Basic Rate Interface
The Basic Rate Interface (BRI) software module does not require user
configuration for normal ISDN operation, but may require configuration when
the interface is used for semipermanent connections.
To display the status of the BRI, enter the command:
SHOW BRI STATE
For more information about configuring BRI, see the Integrated Services Digital
Network (ISDN) chapter in the Software Reference.
Configuring the Primary Rate Interface
The Primary Rate Interface (PRI) software module requires minimal user
configuration for normal operation. Commands are provided to change user-
configurable parameters, show the status of the module, and to examine and
reset a number of data and error counters. You can reset the PRI software
module, but this should not be necessary during normal operation. The PRI
software module requires configuration for E1 and T1 interfaces.
To display the status of the PRI, enter the command:
SHOW PRI STATE
To show the higher layer modules (if any) that are attached to the PRI interface,
enter the command:
SHOW PRI CONFIGURATION
For more information about configuring PRI, see the Integrated Services Digital
Network (ISDN) chapter in the Software Reference.