FCM -8519-1-T4/FCM-8519-2-T4 Product Specification
Finisar
Low Speed Signals, Electronic
Characteristics
Parameter
GBIC Output LOW
GBIC Output HIGH
GBIC Input LOW
Symbol
V
OL
V
OH
V
IL
Min
0
host_Vcc -
0.5
0
Max
0.5
host_Vcc +
0.3
0.8
Units Notes/Conditions
V
4.7k to 10k pull-up to host_Vcc,
measured at host side of connector
V
V
4.7k to 10k pull-up to host_Vcc,
measured at host side of connector
4.7k to 10k pull-up to Vcc,
measured at GBIC side of
connector
4.7k to 10k pull-up to Vcc,
measured at GBIC side of
connector
GBIC Input HIGH
V
IH
2
Vcc + 0.3
V
Table 4. Low speed signals – electronic characteristics
Low Speed Signal Parameters
Parameter
RX_LOS Assert Level
RX_LOS Deassert Level
RX_LOS Hysteresis
RX_LOS Assert Delay
RX_LOS Negate Delay
TX_DISABLE Assert Time
Symbol
--
--
--
t_loss_on
t_loss_off
t_off
Min
Typ
50
90
40
10
10
5
Max
Units Notes/Conditions
mV
mV
mV
µsec
µsec
µsec
µsec
100
100
10
From detection of loss of signal
to assertion of RX_LOS
From detection of presence of
signal to negation of RX_LOS
Rising edge of TX_DISABLE to
fall of output signal below 10%
of nominal
Falling edge of TX_DISABLE to
rise of output signal above 90%
of nominal
Peak to peak
TX_DISABLE Negate Time
t_on
5
1000
TX Output Amplitude,
TX_DISABLE Asserted
70
mV
Table 5. Low speed signal parameters (preliminary)
TX_DISABLE is a TTL signal as described in Tables 3 and 4. RX_LOS is a CMOS
open drain output. MOD_DEF(1) (SCL) and MOD_DEF(2) (SDA) are open drain
CMOS signals (see section VII, “Serial Communication Protocol”). Note that all Finisar
copper GBICs are 'module definition 4' since they support the serial identification
protocol. MOD_DEF(1), MOD_DEF(2), and RX_LOS must be pulled up to host_Vcc.
For more detailed information, see sections 5.3.1 – 5.3.8 in the GBIC Specification Rev.
5.4
1
.
©
Finisar Corporation 03/10/2000
Page 3
FINISAR [ FINISAR CORPORATION. ]
