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Setting
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
setting can be used to force the controller cards to switch. For
example, if controller card
over occurs immediately.
61200659L1-1
The unit switches controller cards if...
more than one out of every 1,000 bits received on the
-3
1E
STS-1 contains a code violation.
more than one out of every 10,000 bits received on
-4
1E
the STS-1 contains a code violation.
more than one out of every 100,000 bits received on
-5
1E
the STS-1 contains a code violation.
more than one out of every 1,000,000 bits received on
-6
1E
the STS-1 contains a code violation.
A
or
B
MX2800 STS-1 User Manual
, indicating the active controller card. This
is active and you select
A
Chapter 3. Configuration
, a switch-
B
3-5
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