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參數(shù)資料
| 型號： | S2036 |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | Open Fiber Control（OFC）System(實現(xiàn)光纖控制（OFC）的系統(tǒng)) |
| 中文描述： | 開放光纖控制（OFC）的系統(tǒng)（實現(xiàn)光纖控制（大洋洲）的系統(tǒng)） |
| 文件頁數(shù)： | 3/14頁 |
| 文件大?。?/td> | 119K |
| 代理商： | S2036 |
3
S2036
OPEN FIBER CONTROL
Symbol
Description
25 Mbyte/s
50/100 Mbyte/s
Units
CNTRL0/0B
Counter Control 0
Low
High
—
t
Pulse duration time
617
154
μ
sec
T
Pulse repetition time
10.1
10.1
sec
t
Stop time
1234
617
μ
sec
LDENon
LOL1 & LOL2 inactive to LDENP/N
2–4
2–4
μ
sec
LDENoff
LOL1 or LOL2 active to LDENP/N
20–40
20–40
μ
sec
ldon
Laser turn–on time
LDENon + Laser activation time
—
ldoff
Laser turn–off time
LDENoff + Laser deactivation time
—
pdf1
Propagation delay, fiber 1
—
pdf2
Propagation delay, fiber 2
—
The two state machines are independent and identi-
cal, and contain the logic to detect when the optical
link becomes open due to a disconnection or break.
They also preside over the link reconnection hand-
shake when it detects that the link is reconnected.
OFC Time Periods
The OFC system uses a repetitive pulsing technique
(i.e., laser activated for t microseconds every T sec-
onds) during the time that a link is open in order to
reduce the maximum possible exposure to a value
which allows for classification as a Class 1 laser
product. The maximum average power level per
pulse is a function of the wavelength, pulse duration
(t), and pulse repetition frequency (PRF = 1/T).
To function correctly, each short-wavelength optical
link port must contain a transmitter/receiver unit that
has implemented the OFC system with compatible
OFC interface timings. The timing values that are
consistent with the stated maximum transmitter re-
ceptacle power and current (1990) IEC laser safety
restrictions for a Class 1 system are shown in Table 1.
These time periods, when used according to the
OFC interface specification described in this section,
should result in a laser product which conforms to
current (1990) emission requirements for Class 1
classification worldwide. Note, however, that classifi-
cation of a laser product must always be verified with
measurements and calculations and not assumed.
The connection and disconnection handshake timing
is shown in Figures 5 and 6. The connection hand-
shake is performed at link initialization or at the
automatic recovery from intentional or accidental in-
terruption of the optical path. The Pulse duration, t, is
chosen to meet the maximum average power level
while allowing for the propagation delay through both
fibers and the light detection and laser turn-on delay
of the complete transceiver system. This margin is
shown as t
setH
. Similarly, the Stop time t
s
is set at
either 2t or 4t to assure that the detected pulse origi-
nates from a properly functioning OFC node. This is
accomplished by the detection of loss of light for a
time t
setL
prior to the end of the Stop time. In Figure
5, the Master node is the one whose 10.1 second
timer expires first after the reconnection is complete.
Figure 6 illustrates the reaction of the system to the
disruption of one fiber (the one between the Master
transmitter and the Slave receiver). Since the other
fiber is still intact in this example, the Master trans-
mitter is shown as again having its 10.1 second
timer expire first, but then resynchronizing to the re-
ceived pulse from the Slave transmitter.
Safety Documentation/Usage Restrictions
Shortwave laser transceiver products incorporating
the OFC system in order to assure Class 1 compli-
ance shall include the following two usage
restrictions as part of the product’s user, mainte-
nance, and safety documentation:
Table 1. Selectable OFC Time Periods
s
t
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