ADTRAN 4200659L7, 4200659L1 Vt Interface, External Clock Configuration, 4. VT Interface Menu

INTERFACE

Chapter 3. Configuration

External Clock Configuration

PRI Ext. Clock and SEC Ext. Clock - When timing is set to external, these entries allow selection of the primary and secondary clock source. Any one of the 28 ports, so long as it is active, can be used. If the selected port does go into AIS or LOS, the selected clock becomes invalid.

VT INTERFACE

The VT INTERFACE menu (shown in Figure 3-4 on page 3-7) allows you to activate/deactivate individual T1s and E1s and to set their line coding, length, loopback detection, circuit protection, and line ID string. The T1/E1 code violation threshold is also configured through this menu. Configuration selections are described in the sections following Figure 3-4 on page 3-7.

A VT group can be divided into either three E1s or four T1s. Therefore, when dealing with an E1 configuration, some of the fields in the VT menus do not apply (and therefore display N/A).

Figure 3-4. VT Interface Menu

61200659L1-1 MX2800 STS-1 User Manual 3-7