CTC Union ETU-01A - Page 62

Chapter 5.Loop Back & BERT Testing
62
May 2011
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