Black Box ME375A-R2, Руководство пользователя

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CHAPTER 4: Operation
Table 4-2. Front-Panel Indicators and Their Functions
Indicator ITU-TSS Function
(CCITT)
Circuit
PWR Green LED is steadily lit while power is present.
RTS 105 Yellow LED is steadily lit while the Request to Send
(RTS) signal from the DTE is high.
TD 103 Yellow LED is steadily lit while the local A/S2W
SHM transmits steady SPACE. It flickers while the
local unit transmits data.
RD 104 Yellow LED is steadily lit while the local A/S2W
SHM receives steady SPACE. It flickers while the
local unit receives data.
DCD 109 Yellow LED is steadily lit while:
a) The local and remote A/S2W SHMs are in sync,
and the local unit’s DCD switch is set to “DCD”;
b) The local and remote A/S2W SHMs are in sync,
the local unit’s DCD switch is set to “CNT”, and the
remote unit has RTS high.
LOS Red LED is steadily lit when synchronization
between the local and remote A/S2W SHMs is lost.
ERR Red LED is steadily lit when the local A/S2W SHM’s
PATT button is in the ON position (depressed) and
the unit detects an error in the BERT pattern.
TEST Yellow LED is steadily lit while the local A/S2W
SHM’s internal BERT is active (the PATT button is
depressed) or the unit is in any of the three
loopback modes.