Fiber optic transceiver board STM1/4/8,
OC3,12,24, FC/GE
Philips Semiconductors
25
Application Note
AN98090
3.2
Dipswitches & LEDs
3.3
Supply voltage selectors
The supply voltage of the RF ICs can be either 5.0 +/- 5% or 3.3 +/- 5% V. The selection on the board is done by
means of soldering the appropriate side of a copper trace selector. No switches are used, to prevent this
switching from disturbing the operation. Note that ALL supplies must be set according to the table below: If the
TABLE 8 Dipswitches & LEDs
Block
LED
D100 J100
D101 J101
D102
D200
D201 J200
Switch
Name
Squelch
PECL/CML
LOS
SIG3004
ENL
Description
Enables squelch mode On=Active, Off=nonactive
Selection of output. On=CML, Off=PECL
LOSTTL flag. On=LOS of Signal
Inverted LOS indicator. On=Signal, Off=LOS
Enables ‘Loop’ mode. On=’Loop’ mode, Off=‘Both’ mode
Out Of Lock. Lock on 19 MHz when Frequency Window
Detector of TZA3004 is active. On=within 1000 ppm of
frequency window, Off=without 1000 ppm frequency
window
Lock of TZA3005’ synthesizer on reference clock input
Test input: synthesizer section power down
Test input : transmit section power down
Line loopback enable input (active LOW). On = no loopback
(= normal operation), Off = loopback (serial output equals
serial input)
Diagnostic loopback enable input (active LOW). On = no
loopback (= normal operation), Off = loopback (parallel
output equals parallel input)
Out of frame enable input
Reference clock select input 0. With standard 19.44 MHz
this should be set off
Reference clock select input 1. With standard 19.44 MHz
VCXO this should be set off
4/8 bit bus width select input.
Serial data rate select STM1/STM4
Reset clean up PLL
test input : reset receive logic
test input : transmit section powerdown
master reset
Bias alarm flag. On = Alarm, Off= No Alarm.
Automatic Laser Shutdown
Resets latch of Alarm3001 to ALS connection. On = Reset,
Off = No Reset
Latched ALS active
Supply of VCXO in cleanup PLL. Disable when external
reference frequency is used
TZA30x0
1 chip
receiver
TZA3004
Data and
clock
recovery unit
D202
OOL3004
TZA3005
Multiplexer
Frame
detect
Demux
Clock
convertor
D300
D312 J312
D301 J301
LOCKDET
STOPSYN
STOPTX
D302 J302
LLEN
D303 J303
DLEN
D304 J304
OOF
D305 J305
REFSEL0
D306 J306
REFSEL1
D307 J307
D308 J308
D309 J309
D310 J310
D311 J311
D313 S300
D400
D401 J400
BUSWIDTH
MODE
RST_PLL
RSTRX
STOPRX
MRST
ALARM3001
ALS
TZA3001
Laserdriver
D402 S400
Alarm Reset
D403
ALS_on
D503 J500
VCCVCXO