Vt mode -5, Protection configuration -5, Active controller -5 – ADTRAN 4200659L1 User Manual
Page 51: Protection configuration
Chapter 3. Configuration
61200659L1-1
MX2800 STS-1 User Manual
3-5
VT Mode
The STS-1 can frame the 7 VT groups as either VT1.5 or VT2.
When set for VT1.5 (T1), all VT groups are set for VT1.5[TU=11]
at 1.728 Mbps and the ports are set for T1 at 1.544 Mbps. When set
for VT2 (E1), all the VT groups are set for VT2[TU-12] at
2.304 Mbps and the ports are set for E1 at 2.048 Mbps. When set
for VT2, the last 7 VTs, VT 22-28, become unavailable. All E1
ports are available for mapping.
Protection Configuration
The MX2800 STS-1 houses two controller cards for 1:1 protection
against hardware failure. The two cards can also provide network
protection, supporting two STS-1 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.
Setting
The unit switches controller cards if...
1E
-3
more than one out of every 1,000 bits received on the
STS-1 contains a code violation.
1E
-4
more than one out of every 10,000 bits received on
the STS-1 contains a code violation.
1E
-5
more than one out of every 100,000 bits received on
the STS-1 contains a code violation.
1E
-6
more than one out of every 1,000,000 bits received on
the STS-1 contains a code violation.