KBU 64
User Manual
80-10100000-09
1–2
ISDN
(Backup Cricuit)
User
Equipment
User
Equipment
Kilostream Line
N
T
U
N
T
U
Kilostream Line
N
T
U
N
T
U
(Main Circuit)
KBU 64
KBU 64
Figure 1.1 KBU 64 sits in the data path
During normal operating conditions, user data passes over the
Kilostream link in the normal manner, with the KBU 64 remaining
transparent to the system. If a failure occurs on the Kilostream line, this
is detected by the KBU 64. After a user defined elapsed time, the KBU
64 dials a remote KBU 64 via the ISDN line . Upon verification of an
acceptable connection the data is then re-directed over this backup path
at 64Kbits per second.
Kilostream backup operation is user configured for either automatic or
manual initiation. While the backup data circuit is in use the KBU 64
monitors the failed Kilostream line and upon detection of its recovery
clears the ISDN call, when data is returned to the Kilostream line (main
leased circuit).
