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 encoding 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, HFBR-5805 is
guaranteed to the full
conditions listed in product
specification tables.
2.5
The transceivers may be used
for other applications at
signaling rates different than
155 Mb/s with some variation
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.
1 x 10-2
Transceiver Jitter Performance
The Agilent 1300 nm
transceivers are designed to
operate per the system jitter
allocations stated in Table B1
of Annex B of the draft ANSI
T1E1.2 Revision 3 standard.
The Agilent 1300 nm
transmitters will tolerate the
worst case input electrical
jitter allowed in Annex B
without violating the worst
case output jitter requirements.
The Agilent 1300 nm receivers
will tolerate 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 trans-
ceivers are allowed to make to
the overall system jitter
without violating the Annex B
allocation example. In practice
the typical contribution of the
Agilent transceivers is well
below these maximum allowed
amounts.
TRANSCEIVER RELATIVE OPTICAL POWER BUDGET
AT CONSTANT BER (dB)
2.0
1 x 10-3
1.5
BIT ERROR RATE
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
HFBR-5805 SERIES
1.0
0.5
0
0.5
CENTER OF SYMBOL
0
25
50
75
100
125
150
175 200
-6
-4
-2
0
2
4
SIGNAL RATE (MBd)
CONDITIONS:
1. PRBS 2
7
-1
2. DATA SAMPLED AT CENTER OF DATA SYMBOL.
3. BER = 10
-6
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.
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 5. Transceiver Relative Optical Power
Budget at Constant BER vs. Signaling Rate.
Figure 6. Bit Error Rate vs. Relative Receiver
Input Optical Power.
6
HP [ AGILENT(HEWLETT-PACKARD) ]
