AN5116-06B Optical Line Terminal Equipment Hardware Description
4-14
Version A
Interface Description
Table 4-18
The C155A card interfaces
Symbol
Meaning
Description
CLIK IN1
Clock input interface
The first external clock input.
CLIK IN2
Clock input interface
The second external clock input.
CLIK OUT
Clock output interface
The external clock output.
1-2
STM-1 uplink optical
interface
Provides two STM-1 optical interfaces and connects
with the transmission network. If two interfaces are
used at same time, optical interface 1 will be active by
default.
Indicator LED Description
Table 4-19
The C155A card indicator LEDs
Symbol Meaning
Color Status
Description
ACT Active
LED
Green
ON
The card is working normally
Blink
slowly
The card is initializing
Blink
quickly
The card is executing a configuration
command
OFF
The card is not powered on
ALM Alarm
indicator Red
ON
The card is resetting, experiencing an
alarm or has failed to establish a
communication link between the active
card and the standby card
OFF
The card is working normally
LNK1-2 Port status LEDs
Green
ON
The optical interface is linked up
Blink
quickly
The optical interface is transmitting or
receiving data
OFF
The optical interface is not linked up
MS1-2
Active/Standby
LEDs
Green
ON
The optical interface is active
OFF
The optical interface is the standby unit
Key Description
Table 4-20
The C155A card key
Symbol
Meaning
Description
K1
Reset key of the card
For card reset. May result in interruption of all
hosted services.
