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Testing ICX-250 Diagnostics 53
Issue 1, September 1998 ADCP-62-023
© 1998, ADC Telecommunications, Inc.
The bold highlighted selected under “Options” is the Factory Setting.
Function Switch
Switch
Location
Options Description
T1 INTERFACE:
T1 Interface
T1 Loopback
(see page 54)
T1 Loopback Front (slide) Network
Local
Off
Network:
Loops signal back to the net-
work and breaks the transmit and receive
paths between the Framer and LIU and
loops T1 receive onto the T1 transmit
within the Framer chip.
Local:
Loops signal back to the network
and breaks the transmit and receive paths
between the LIU and the line and loops
the T1 transmit signal onto the T1 receive
within the LIU.
T1 Test
Pattern
QRSS
(see page 56)
QRSS
Quasi Random Signal
Source. Used for
diagnostic capabilities
for analog, remote and
dual loopbacks as well
as remote test.
Front (slide) On
Off
On:
All connections between either Data
Ports or the FXS Ports and the T1 inter-
face are broken and a QRSS pattern is
transmitted onto the T1 interface. At this
time the T1 Test Pattern LED will light
when QRSS is being transmitted.
Note: ONLY works with framed T1
.
DATA PORTS:
Loopback
(see page 58)
Data Port 1 and 2
Loopback
Front (slide) Local
Network
Off
Local:
Breaks the receive signal on the
network side between the Data Port 1 or 2
and the T1 interface and loops the Data
Port 1 or 2 transmit signal onto the
receive side.
Network:
Breaks the transmit signal on
the network side between the Data Port 1
or 2 and the T1 interface and loops the
Data Port 1 or 2 receive signal onto the
transmit side.
Test Pattern
(see page 60)
1 / Off / 2 Front (slide) 1: Test Port 1
2: Test Port 2
OFF
: no Test
1:
Breaks the transmit and receive paths
between the Data Port 1 line and the
receiver and inserts the 2047 pattern onto
the transmit path. Also turns on the 2047
receiver.
2:
Breaks the transmit and receive paths
between the Data Port 2 line and the
receiver and inserts the 2047 pattern onto
the transmit path. Also turns on the 2047
receiver.
OFF:
2047 function is disabled.