Configuring ISDN BRI Directory
List of Tasks for ISDN BRI Interface Configuration
Example of configuring ISDN BRI Interface
Integrated
Services Digital Network ((SDN for short) is a new technology developed in
1970s, it provides the complete digital service from terminal user to terminal
user, integrating the transmission of voice, data, graphics, video, etc. Function Cluster
includes: l
Network 1 (NT1): It realizes the function of the
first layer of OSI, including the function of transmission of user’s circuit,
loop test and competition of D channel, etc. l
Network 2 (NT2): It is also called Intelligent
Network Terminal l
Terminal equipment (TE1) under category 1: It is
also call standard equipment of ISDN. It is the user’s equipment that meets
the standards of ISDN interface (such as digital telephone, etc) l
Terminal equipment under category 2 (TE2): It is
also called the equipment of non ISDN standard. It is the user’s equipment
that does not meet the ISDN interface standard. l
Terminal adapter (TA): It enables TE2 to access to
ISDN standard interface through adaptation. l
ISDN is different from traditional PSTN in which the
information of user is transmitted to exchanger through analogous subscriber
loop, then is converted into digital signal through A/D and finally is restored
to analog signals through digital switching and transmission network. ISDN
resolves the issue of digital transmission of subscriber loop, achieving the
digitalization from terminal to terminal. It realizes the smooth transmission of
various digital and analog information through the standard digital interface.
ITU-T established the service standard of ISDN by standardizing service
protocol, which makes the integrated service possible. The protocols of I.430、Q.921and
Q.931 and others enables the equipments complying with ITU-T physical interface
and software protocol to access to ISDN freely.
ISDN circuit has two or more B channel with a capacity of 64
Kbps for data transmission and D channel with a capacity of 16 Kbps for signal
transmission. Each B channel can be configured as a port. The function of
multi-link can execute the collection of ISDN channel. Multi-link means that
multiple physical links is integrated into a logic bunch, which broadens the
bandwidth of linkage. In addition, it can allocate multiple addresses
dynamically, which enables ISDN circuit to be in service when it is needed,
maximize the unitization of bandwidth and improving the data transmission
efficiency.
According to ITU-T I.411 suggestion, function cluster (a
group of function needed for user‘s accesses to ISDN), reference point (a
conceptual point used to classify function cluster), the reference configuration
of ISDN user-network interface is formulated, just as shown in the following
chart.
The reference point
include:
l
S reference point: It is located between user’s
terminal and NT2
l
T reference point: It is located between NT1 and
NT2
l U reference point: It id located between NT1 equipment and circuit terminal equipment
ISDN exchanger can be classified into several types
based on their geographic locations, such as European type, North American type,
Australian Type and Japanese type. The protocol of these types of routers remain
some difference. Nevertheless, ISDN routers made by different manufacturers has
a good compatibility, which enables the calling of local BRI configured with the
exchanger different from the remote exchanger. In Chinese market, most of ISDN
exchangers are manufactured in North America. The command “isdn switch-type”
is used to configure the type of ISDN exchanger linked to BRI interface. The
negotiation mode of TE1 has two: One is used when the first calling takes place,
the other is used when router is started. The coomand “isdn tei-negotiation”
is used to configure TE1 negotiation mode of ISDN.
List of Tasks for
ISDN BRI Interface Configuration
l
Configuring ISDN parameter
l
Configuring IP address of ISDN BRI or invoking
address negotiation
l
Configuring Dialer map of destination address
l
Configuring link layer Protocol PPP and
authentication
l
Configuring DDR parameter
l
Configuring relevant IP router
The detail of the said
configuration can be referred to the relevant Configuration Command.
Example of configuring ISDN
BRI Interface
1. Example 1: Log on
network through ISDN, the remote terminal is access server
1)
Demands of Network Establishment
2) Chart of Network
Establishment
3)
Steps for Configuration
Configuring
the interface of ISDN BRI interface of 1700 router:
!configuring
global ISDN switch type
router_config#isdn
switch-type basic-5ess
!Encapsulating
Link Layer Protocol PPP(default
encapsulation protocol is PPP)
router_config#interface
bri 0/0
router_config_b0/0#encapsulation ppp
!Configuring
PAP user’s name and password
router_config_b0/0#ppp
pap sent-username 8163 8163
!Configuring
IP address negotiation of ISDN BRI interface
router_config_b0/0#ip address
negotiated
!Configuring
Dialer Map of NAS
router_config_b0/0#dialer
map 202.96.20.133 8163
!Configuring
Static router to NAS
router_config_b0/0#quit
router_config#ip route 0.0.0.0 0.0.0.0 bri0/0
2. Example 2: The
linkage of local ISDN BRI interface and ISDN PRI interface at the center.
1)
The Demand of Network Establishment
2) Chart of Network
Establishment
3) Steps for Configuration
Configuring ISDN BRI interface of 1700 router
!Configuring global ISDN switch type
router_config#isdn
switch-type basic-5ess
!Configuring
IP address of interface
router_config#interface bri 0/0
router_config#ip address 10.0.0.1 255.0.0.0
!Encapsulating
link layer protocol PPP(default
encapsulation protocol is HDLC)
router_config_b0/0#encapsulation ppp
!Configuring
user’s name and password of PAP
router_config_b0/0#ppp pap sent-username router mypassword
!Configuring
Dialer Map to the center of ISDN PRI
router_config_b0/0#dialer map 10.0.0.100 12345678
!Configuring
static router to the center of ISDN PRI
router_config_b0/0#quit
router_config#ip route 0.0.0.0 0.0.0.0 bri0/0