H2Tu-R Front Panel Pushbuttons - ADTRAN 1181113L2 Installation And Maintenance Practice

HDSL2 for General Distribution Installation and Maintenance Practice HDSL2 System Testing
In addition to network-side loopbacks, an H2TU-C module provides customer-side loopbacks
initiated by using either the terminal control port or in-band loop codes. For more infor¬
mation, refer to "Appendix A, HDSL2 Loopbacks". In this mode, an AIS signal (all ones) is
supplied to the network.
Figure 8. HDSL2 Loopbacks
H2TU-R Front Panel Pushbuttons
Two loopback (LBK) pushbuttons are accessible from the front panel of the H2TU-R. The REM
loopback button controls a customer loopback at the H2TU-C. The LOC loopback button
controls a bidirectional loopback at the H2TU-R. Table 8 details the loopback pushbutton
operation.
Table 8. Front Panel Loopback Pushbuttons
Pres: rg this the H2TU-C loopback st
ropback, pressing this br • If the H2TU-C i
• If the H2TU-C is in loopback, pressing this be
Pressing this button changes the H2TU-R loopbac
• If the H2TU-R is not in loopback, pressing thi
• If the H2TU-R is in loopback, pressing this be
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