AFBR-5805AZ Просмотр технического описания (PDF) - Avago Technologies

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AFBR-5805AZ

ATM Transceivers for SONET OC-3 / SDH STM-1 in Low Cost 1 x 9 Package Style

Avago Technologies 

Transceiver Signaling Operating Rate Range and BER

Performance

For purposes of definition, the symbol (Baud) rate, also

called signaling rate, is the reciprocal of the symbol time.

Data rate (bits/sec) is the symbol rate divided by the en-

coding factor used to encode the data (symbols/bit).

When used in 155 Mb/s SONET OC-3 applications the

performance of the 1300 nm transceivers, AFBR-5805 is

guaranteed to the full conditions listed in product speci-

fication tables.

The transceivers may be used for other applications at

signaling rates different than 155 Mb/s with some varia-

tion in the link optical power budget. Figure 5 gives an

indication of the typical performance of these products at

different rates.

These transceivers can also be used for applications

which require different Bit Error Rate (BER) performance.

Figure 6 illustrates the typical trade-off between link BER

and the receivers input optical power level.

Transceiver Jitter Performance

The Avago Technologies 1300 nm transceivers are de-

signed to operate per the system jitter allocations stated

in Table B1 of Annex B of the draft ANSI T1E1.2 Revision 3

standard.

The Avago Technologies 1300 nm transmitters will toler-

ate the worst case input electrical jitter allowed in Annex

B without violating the worst case output jitter require-

ments.

The Avago Technologies 1300 nm receivers will toler-

ate the worst case input optical jitter allowed in Annex

B without violating the worst case output electrical jitter

allowed.

The jitter specifications stated in the following 1300 nm

transceiver specification tables are derived from the

values in Tables B1 of Annex B. They represent the worst

case jitter contribution that the transceivers are allowed

to make to the overall system jitter without violating the

Annex B allocation example. In practice the typical con-

tribution of the Avago Technologies transceivers is well

below these maximum allowed amounts.

2.5

2.0

1.5

1.0

0.5

0

0.5

0 25 50 75 100 125 150 175 200

SIGNAL RATE (MBd)

CONDITIONS:

1. PRBS 2 7-1

2. DATA SAMPLED AT CENTER OF DATA SYMBOL.

3. BER = 10 -6

4. TA = +25° C

5. V CC = 3.3 V to 5 V dc

6. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns.

Figure 5. Transceiver Relative Optical Power Budget

at Constant BER vs. Signaling Rate.

1 x 10 -2

1 x 10 -3

1 x 10 -4

1 x 10 -5

1 x 10 -6

1 x 10 -7

1 x 10 -8

1 x 10 -9

1 x 10 -10

1 x 10 -11

1 x 10 -12

-6

-4

AFBR-5805Z SERIES

CENTER OF SYMBOL

-2

0

2

4

RELATIVE INPUT OPTICAL POWER - dB

CONDITIONS:

1. 155 MBd

2. PRBS 2 7-1

3. CENTER OF SYMBOL SAMPLING

4. T A = +25°C

5. V CC = 3.3 V to 5 V dc

6. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns.

Figure 6. Bit Error Rate vs. Relative Receiver Input

Optical Power.

6

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