ADTRAN IQ 710, Системное руководство

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61202800L1-1B
IQ 710
Section 6, Configuration Guides
Page 169
© 2002 ADTRAN, Inc. IQ 710 System Manual
EXAMPLE OF THE IQ 710 DBU ON INACTIVE GROUP PARAMETER
Introduction
The ADTRAN IQ 710 provides disaster recovery protection for Frame Relay circuits. This configuration
guide will describe how the
DBU O
N
I
NACTIVE
G
ROUP
parameter works. The units used in this example are
IQ 710s with ISDN BRI DBU and T1/DSX cards.
Before You Begin
For this example, each IQ 710 unit will require an ISDN BRI DBU card (P/N 1204004L2) and a T1/DSX
card (P/N 1202803L1).
Network Description
Figure 1 on page 170 is a diagram of the Frame Relay example network used in this configuration guide. In
this example, the host site is Huntsville. Two Permanent Virtual Circuits (PVCs) originate from Hunts-
ville. One circuit is connected to Atlanta and the other to Birmingham. There are two DLCIs used by the
host site to communicate with the Atlanta remote site (DLCIs 16 and 18). These correspond to DLCIs 17
and 19 at the Atlanta site. The host site uses only one DLCI (DLCI 20) to communicate with Birmingham,
which has a corresponding DLCI of 21. Please remember that DLCIs have local significance and are
assigned by the Telephone Company (TELCO) when the Frame Relay network is built; therefore the
DLCIs for your Frame Relay network will most likely be different from the ones used in this example.
The remaining parameters described in Figure 1 provide a description of the BRI lines that terminate into
the three IQ 710s. The Telephone Company will provide you with the Local Directory Numbers (LDNs)
and Service Profile Identifiers (SPIDs) for each of your BRI lines. In addition, you must know which type
of Central Office (CO) switch is providing the ISDN service.
There is a special setting for the DBU O
N
I
NACTIVE
parameter called G
ROUP
. This allows you to group a set
of DLCIs together. These DLCIs do not have to be assigned to the same physical site. When several DLCIs
are set for
G
ROUP
, the IQ 710 will not attempt a dial backup session until all DLCIs in that group are inac-
tive. When that happens, the IQ 710 will place calls based on the
C
ALL
O
RDER
parameter. If one of the
DLCIs in the group returns to the active state, all dial backup connections to the remaining DLCIs in that
group will be disconnected.
For the following example, the host DLCIs (DLCIs 16, 18, and 20) will be set as a group to illustrate how
this parameter works. All criteria other than
DBU O
N
I
NACTIVE
G
ROUP
have been disabled for all DLCIs on
both the host and remote sites. This will ensure that only the host unit will initiate a DBU session and it
will only initiate it based on the
DBU O
N
I
NACTIVE
G
ROUP
conditions being met.