Figure 24. Hdsl Loopbacks - ADTRAN HDSL DDM+ HTU-C Installation And Maintenance Practice

DSX-1
DSX-1
HTU-C
X
AIS
HTU-C
X = Signal Inactive
61247003L6-5A
HTU-C Network-Side Loopback
DSX-1
HTU-C
HTU-R Network-Side Loopback and/or HTU-R NIU Loopback
DSX-1
HTU-C
HTU-R Customer-Side Loopback
X
D
HTU-C
HTU-R Bilateral Loopback
HTU-C
HTU-C Customer-Side Loopback
X
AIS
HTU-C
HRE Network-Side Loopback
HTU-C
Dual HRE Network-Side Loopback
HRE
Dual HRE Customer-Side Loopback
HRE
D = Data Sent

Figure 24. HDSL Loopbacks

D*
LOCAL
LOOP
X
HTU-R
LOCAL
LOOP
X
HTU-R
LOCAL
LOOP
HTU-R
LOCAL
LOOP
HTU-R
LOCAL
LOOP
HTU-R
X
X
HRE HTU-R
HRE
HRE
* = Signal is AIS if using 1245026L x HTU-R.
HDSL System Testing
DS1
AIS
DS1
DS1
DS1
DS1
AIS
X
HTU-R
DS1
DS1
HTU-R
37