ADTRAN 4200659L8 Protection Configuration, Setting, The unit switches controller cards if

	Chapter 3. Configuration
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.

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.

61200659L1-1 MX2800 STS-1 User Manual 3-5