CTC Union ETU-01A - Page 108

Chapter 5. Loop Back and BERT Testing
102
November 2001
BERT for system test
For a system test, use the remote site’s E1 link local digital
or payload loop back or data port local digital loop back, to return
the data back to the local DTE over the E1 link, as shown in
Figure 5-10. Additionally, you may use the local site’s E1 link
remote analog, remote payload or Data Port V.54 loop back to
return the data back to the local DTE.
Figure 5-10. BERT used for system test
Remote Site:
E1 Link local digital (shown) or payload
loop back; Data Port local digital loop
back.
Local Site:
E1 Link Remote analog or payload
loop back; Data Port V.54 loop
back (shown).
DTE
DSU
E1
CSU
LOCAL ETU-01A
DTE
DSU
CSU
REMOTE ETU-01A
Generator
Tester