7-8
Axxius 800 - Release 2.2
DS3 Controller Card
Controller and DS3 Redundancy
Controller and DS3 Redundancy
Protection Modes
The Axxius 800 can be provisioned with one or two DS3 Controller cards and
connections to one or two DS3 lines, which will provide the following levels of
protection:
l
Electronics Protection – when provisioned with two Controller cards and only
one DS3 line, only the Controller cards can be protected
l
Network Protection – when provisioned with one Controller and two
independent DS3 lines, only the DS3 lines can be protected.
l
Electronics and Network Protection – when provisioned with two Controller
cards and two independent DS3 lines, both the controller cards and the DS3 lines
can be protected
Electronics Protection Mode
In this mode there are two DS3 Controllers installed the Axxius 800, but only one DS3
line connected.
The electronics mode of protection provides Controller card redundancy. Because there
is only one DS3 connected, there is no DS3 redundancy. The receive path from the DS3
line is simultaneously applied to the receiver of both Controller cards (see Figure). This
enables both controllers to monitor the condition of the DS3 line so both are
continuously framed up to the incoming signal. The Controller-select signal disables
the outputs of the low-speed receive paths on the standby Controller and enables the
low-speed receive paths on the active controller. The active Controller’s transmit signal
is connected to the transmit path of the DS3 line through a relay, while the standby is
disconnected until a protection switch occurs.
The automatic redundancy mode is used to enable and disable protection switching. If
the redundancy control process determines the active controller is malfunctioning, or a
maintenance switch is invoked (the switch command), a protection switch will occur.
This means that the active Controller relinquishes control to the secondary Controller.
This is done by enabling the standby Controller’s receive path and disabling the
originally active Controller’s low-speed receive path (Controller-select signal) and
Summary of Contents for Network Device Axxius 800
Page 1: ...Axxius 800 USER MANUAL Part Number 770 0104 AG Product Release 2 2 May 2004 ...
Page 32: ...xxxii Axxius 800 Release 2 2 Table of Contents ...
Page 50: ...1 18 Axxius 800 Release 2 2 Base Platform ACO ...
Page 101: ...CHAPTER CLI Commands In this Chapter n Command Line Interface Help n CLI Commands ...
Page 392: ...8 8 Axxius 800 Release 2 2 FXO Voice Card Channel Associated Signaling CAS Conversions ...
Page 430: ...12 8 Axxius 800 Release 2 2 Power Supply Installing Replacing a Power Supply ...
Page 472: ...15 20 Axxius 800 Release 2 2 Terminal Server Router Card LEDs ...
Page 500: ...18 12 Axxius 800 Release 2 2 Maintenance Hot Swap Service Card ...
Page 532: ...C 22 Axxius 800 Release 2 2 Loopback Tests V 35 V 54 Loop ...
Page 552: ...Glossary 20 Axxius 800 Release 2 2 Glossary ...