Verilink M1-3 (880-503136-001) Product Manual - Manual (Page 63)

M1-3 Diagnostics
Verilink M1-3 User Manual 5-7
Figure 5-10 DS3 FEAC Far-End Loopback
DS3 Inband Far-
End Loopback
The DS3 Inband Far-End Loopback uses the same loopback codes as
the DS3 FEAC Far End Loopback. Different overhead bits are used
to transmit the loopback request. This is a proprietary loop-up
method which prevents equipment within the telco cloud from
interfering with the loop-up codes. Both ends of the circuit must
have Verilink M1-3s and have inband enabled in the Configuration
Menu. (
Figure 5-11 ).
Figure 5-11 DS3 Inband Far-End Loopback
M1-3 T1
Loopbacks
There are three ways to loopback the 28 T1 ports at the M1-3
midplane access point:
• Local loopback,
• Line loopback and
• Far-end loopback.
Each of these loopbacks can be activated and deactivated for
individual T1s or all 28 T1s. These loopbacks are described in the
following section with corresponding menu options.
T1 Loopback
Types
The M1-3 Loopback Selection Menu ( Figure 5-6 ) displays the T1
loopback options. Select the desired loopback type and press E NTER .
The T1 Loopback Options Menu displays for that loopback.
For example, Figure 5-12 shows the T1 Far End Loopback Options
Menu. The T1 loopback options for all three T1 loopbacks are the
same as those in
Figure 5-12 .
M1-3 M1-3
Near End Far End
M1-3 M1-3
Near End Far End