Filter
Top Products
Checking Signal Status
3–60
CTS 710 SONET Test Set User Manual
H Red lights indicate the associated condition is valid. For example,
if the red light next to LOS is on, no signal is being received. See
Table 3–6.
H A yellow light is associated with each red light. The yellow lights
are turned on when an error, alarm, or failure condition first
occurs and then stay on to indicate the history even if the
condition goes away (see Table 3–6). Press the CLEAR
HISTORY button to clear the status history.
Table 3–6: Red and Yellow Status Lights
Label on Light
Meaning if Light is On
LOS Loss of received signal.
LOF Loss of frame of received signal.
LOP Loss of STS or VT pointer for selected channel in
received signal.
LINE AIS A line alarm indication signal is being received.
LINE FERF A line far end receive failure code is being received.
PATH AIS A path alarm indication signal is being received.
PATH FERF A path far end receive failure signal is being received.
VT AIS A tributary alarm indication signal is being received.
(Add/Drop/Test Option Only)
VT FERF A tributary far end receive failure is being received.
(Add/Drop/Test Option Only)
DS1/DS3 AIS A tributary alarm indication signal is being received.
(Add/Drop/Test Option Only)
DS1/DS3 YELLOW A tributary yellow signal is being received. (Add/
Drop/Test Option Only)
ERROR A bit, section, line, path, or VT parity error is detected;
or a line, path, or VT FEBE is being received.
POINTER ADJ A pointer adjustment is being received.
Checking Signal Status
3–60
CTS 710 SONET Test Set User Manual
H Red lights indicate the associated condition is valid. For example,
if the red light next to LOS is on, no signal is being received. See
Table 3–6.
H A yellow light is associated with each red light. The yellow lights
are turned on when an error, alarm, or failure condition first
occurs and then stay on to indicate the history even if the
condition goes away (see Table 3–6). Press the CLEAR
HISTORY button to clear the status history.
Table 3–6: Red and Yellow Status Lights
Label on Light
Meaning if Light is On
LOS Loss of received signal.
LOF Loss of frame of received signal.
LOP Loss of STS or VT pointer for selected channel in
received signal.
LINE AIS A line alarm indication signal is being received.
LINE FERF A line far end receive failure code is being received.
PATH AIS A path alarm indication signal is being received.
PATH FERF A path far end receive failure signal is being received.
VT AIS A tributary alarm indication signal is being received.
(Add/Drop/Test Option Only)
VT FERF A tributary far end receive failure is being received.
(Add/Drop/Test Option Only)
DS1/DS3 AIS A tributary alarm indication signal is being received.
(Add/Drop/Test Option Only)
DS1/DS3 YELLOW A tributary yellow signal is being received. (Add/
Drop/Test Option Only)
ERROR A bit, section, line, path, or VT parity error is detected;
or a line, path, or VT FEBE is being received.
POINTER ADJ A pointer adjustment is being received.