Ds1 Line Loopback - Alcatel-Lucent MDR-8000 User Manual

Eth Equipment Loopback
6.11.3.3
Eth equipment Loopback is a farend loopback function that can be used to test the
over-the-hop performance of radios. Eth Equipment loopback is enabled by selecting A
Eth Equipment under SYSTEM LOOPBACK on the USI Control screen. This function
loops the radio RCV (RR) input into the radio XMT output. The actual loopback occurs
in the PHY circuits on the I/O interface. When enabled, the radio RCV (RR) input is
switched through the MUX in the ETHRA and through the MUX in the PHY , replacing
the Eth RCV /radio XMT (Eth R/RT ) output to the ETHRA . The radio RCV (RR) input
also continues through the MUX in the PHY to the Eth T/RR output.
6.11.4

DS1 Line Loopback

There are two individual DS1 line loopback functions available on the Ethernet radio
Control screen; Line facility Loopback and Line Equipment Loopback. All loopbacks
occur on the Ethernet I/O interface module. The DS1 line loopback functions are con-
trolled by software via the DS1 LINE LOOPBACK controls on the USI Control screen.
DS1 Line Facility Loopback
6.11.4.1
See Figure 6 - 19 for functional block diagram. DS1 facility loopback is a local loopback
function that can be used to test the performance of a standalone radio. Individual
DS1 line facility loopback is enabled by selecting Line 1, 2, 3, or 4 Facility under DS1
on the USI Control screen. This function loops the DS1 RX 1, 2, 3,
LINE LOOPBACK
or 4 Tip and Ring inputs to the DS1 TX 1, 2, 3, or 4 Tip and Ring outputs. The actual
loopback occurs in the QuadFalc FPGA on the I/O interface. When enabled, the DS1 ,
RX1, 2, 3, or 4 Tip and Ring inputs are switched through the MUX in the QuadFalc,
replacing the radio inputs from the ETHRA . The radio DS1 Rx1, 2, 3, or 4 Tip and Ring
output of the QuadFalc also continues to the ETHRA FPGA .
6.11.4.2 DS1 Line Equipment Loopback
See Figure 6 - 20 for a functional block diagram. DS1 Equipment Loopback is a farend
loopback function that can be used to test the performance of radios over the hop. Indi-
vidual Line Equipment facility loopback is enabled by selecting
under
Equipment DS1 LINE LOOPBACK
loops the DS1 TX 1, 2, 3, or 4 Tip and Ring inputs from the RCV circuits on the ETHRA
to the DS1 RX 1, 2, 3, or 4 Tip and Ring outputs of the QuadFalc to the XMT circuits in
the ETHRA . The loopback occurs in the QuadFalc FPGA on the I/O interface. When
enabled by the switch command, the DS1 TX 1, 2, 3, or 4 Tip and Ring inputs are
switched through the MUX in the QuadFalc, replacing the radio DS1 inputs from the
AUX interface. The radio DS1 TX 1, 2, 3, or 4 output of the QuadFalc continues to the
AUX interface board.
Line 1, 2, 3, or 4
on the USI Control screen. This function
6 - 21