OC-192/STM-64 Transponder

7km and 20km transmission

Feb. 15, 2006

Fiberxon Proprietary and Confidential, Do Not Copy or Distribute

Page 10 of 14

Digital Alarm Signal

Table 13 - Alarms Digital signals

Function

Symbol

Level

Description

Note

Common Digital Signal

L

Any alarm from

both transmitter

and receiver

Indicates

all

alarm active

ALMINT

LVTTL

H

Normal operation

Activation Time: 10ms

Deactivation Time: 10ms

Transmitter

L

Alarm active

Loss of Tx PLL

lock

TxLOCKERR

LVTTL

H

Normal operation

Loss of transmitter PLL lock

Activation Time: 1ms

Deactivation Time: 1ms

L

Alarm active

(FIFO overflow)

MUX FIFO error

TxFIFOERR

LVTTL

H

Normal operation

TxError is internally connected to

TxFIFO RES. (Default) Customer may

have control of TXFIFO RES without

internal loopback (Optional)

L

Alarm active

(laser bias

current alarm)

Laser bias out

of range

LsBIASALM

LVTTL

H

Normal operation

Alarm when laser bias changes by a

factor of 2 from beginning of life or if

monitor

reaches

maximum

level

corresponding to approximate150mA.

Activation Time: 10 ms

Deactivation Time: 10 ms

L

Alarm active

Laser

temperature out

of range

LsTEMPALM

LVTTL

H

Normal operation

Laser temperature 5°C from nominal,

Activation Time : 10ms

Deactivation Time : 10ms

L

Alarm active

Laser

output

power

out

of

range

LsPOWALM

LVTTL

H

Normal operation

Output power degrades 3dB below the

BOL Activation Time : 10ms

Deactivation Time : 10ms

L

Alarm from

transmitter

Tx alarms

TxALMINT

LVTTL

H

Normal operation

Activation Time: 10 ms;

Deactivation Time: 10 ms

Receiver

L

Alarm active

Loss of Rx PLL

lock

RxLOCKERR LVTTL

H

Normal operation

Activation Time: 1ms

Deactivation Time: 1ms

L

Alarm active

Loss of receiver

average power

alarm

RxPOWALM

LVTTL

H

Normal operation

Activation Time: <60us

Deactivation Time: <60us

L

Alarm from

transmitter

Rx alarms

RxALMINT

LVTTL

H

Normal operation

Activation Time: 10 ms;

Deactivation Time: 10 ms