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Remote Loopback
A Remote Loopback performs a loopback of the selected T1/E1 on the far-end M13 multi-
plexer. If an M13 MUX is located at the far-end, an Analog Network loopback is executed when
a Remote Loopback is engaged. This loopback is only available when the DS3 network is
configured for C-bit parity framing since it requires the availability of the Far-End Alarm and
Control (FEAC) channel. Refer to ANSI T1.107 for additional information.
Low-Speed Loopbacks
Low Speed Loopback commands activate a loopback on the terminating equipment on the
near-end T1/E1 circuit (does not traverse the DS3).
High-Speed Loopbacks
High Speed Loopback commands activate a loopback on the terminating equipment on the
far-end T1/E1 circuit (traverses the DS3).
The Low and High Speed loopback types include the following selections:
• CSU loopback
• CSU loopback with BERT
• NIU loopback
• NIU loopback with BERT
• Line BERT
These loopbacks are described below.
Bit Error Rate Test (BERT)
The MX2820 M13 MUX has the capability to send, receive, and measure the number of bit
errors on a circuit. Six digital patterns are available from the BERT Pattern menu. The BERT
pattern is selected by using option 38 on the MX2820 Loopbacks menu
84). The resulting pattern selection screen is shown in
1186002L3).
61186003L1-1D
Section 5, User Interface Guide - UIG-530, M13 Loopbacks
Figure 5-56
(see
(Figure 5-50
on page
Figure 5-57
for P/N
5-87
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