ADTRAN TOTAL ACCESS MX2800, User Manual

Page: 41 / 142

Chapter 3. Configuration
61200290L1-1 MX2800 User Manual 3-5
Protection Configuration
The MX2800 houses two controller cards for 1:1 protection against
hardware failure. The two cards can also provide network
protection, supporting two T3 circuits simultaneously. The
selections in this menu allow you to customize the unit’s protection
setup:
Active Controller
This field displays
A
or
B
, indicating the active controller card. This
setting can be used to force the controller cards to switch. For
example, if controller card
A is active and you select B , a switch-
over occurs immediately.
Network Protection
Enable or disable the unit’s ability to automatically route
information to the backup T3 in the event of a primary T3 failure.
With
N
ETWORK
P
ROTECTION
set to
E
NABLED
, all information is
automatically routed to the backup T3 in the event that the primary
T3 fails. When
N
ETWORK
P
ROTECTION
is set to D
ISABLED
, the stand-
by controller will be used to protect against failures of the circuitry
on the active controller.
Max. Switch Threshold
The value entered in this field determines how many times each
hour the unit is allowed to switch between controller cards. If, in an
hour, the cards switch more than the
M
AX
S
WITCH
T
HRESHOLD
, the
unit issues a trap (see page 3-19) and stops switching cards for the
next 24 hours. The default setting is
3 times an hour.
Min. Switching Period
After the unit switches controller cards, the number of seconds
entered in this field must pass before another card switch will be
allowed. The default setting is
10 seconds.
When choosing a setting for N
ETWORK
P
ROTECTION
, there are many
cabling and network provisioning issues to consider. Refer to the chapter
Circuit and Network Redundancy on page 7-1 for configuration examples
of the different modes of protection.