MX2800 STS-1 User Manual Configuration, Section 3
Network Interface
61204659L1-1A 3-7
VT Mode
The seven VT groups may be configured to carry either VT1.5 or VT2 tributaries.
• 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), and the last 7 ports (ports 22-28)
become unavailable.
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 menu selections
allow customization of setup parameters.
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 B is selected, a switch-over
occurs immediately.
Network Protection
This option allows enabling or disabling of the ability to automatically route the STS-1 to the backup facil-
ity in the event of a facility failure.
• Network Protection =
Enabled: All information is automatically routed to the backup facility in the
event of a primary facility failure.
• Network Protection =
Disabled: The primary STS-1 facility (A) is utilized at all times.
NOTE
When choosing a setting for Network Protection, cabling and network
provisioning issues must be considered. For configuration examples of
the different modes of protection, refer to Section 7, Circuit Redundancy.
Max. (Maximum) Switch Threshold
The value entered in this field determines the number of times per hour the unit is allowed to switch
between controller cards. If protection switching occurs more than the Max. Switch Threshold within one
hour, the unit issues a trap and inhibits automatic protection switching for the next 24 hours. The default
setting is 3 times an hour. This count may be cleared by clearing protection switch alarm counts (refer to
Protection Switch Statistics on page 5-13).
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