參數(shù)資料
型號(hào)： LXT6155
廠商： Intel Corp.
英文描述： 155 Mbps SDH/SONET/ATM Transceiver
中文描述： 155速率的SDH / SONET / ATM的收發(fā)器
文件頁(yè)數(shù)： 16/50頁(yè)
文件大?。?/td> 291K
代理商： LXT6155
LXT6155 — 155 Mbps SDH/SONET/ATM Transceiver
16
Datasheet
frames with incorrect frame words are required. Byte alignment occurs when entering the in-frame
state. In case of an OOF event, the byte alignment and frame pulse position are frozen. The ROFP
output continues unchanged until re-entering the in-frame state.
Figure 3. Framing State
2.2.2.1
Loss of Signal (LOS)
Loss of Signal provides an alarm signal indicating incoming signal voltage is weak or incoming
data does not contain enough transitions. This signal is available in HW mode on pin #45 and in
SW mode as status and interrupt (Reg #15, modes 00 and 05).
2.2.2.2
Coax Interface
Loss of Signal provides an alarm output that indicates weak line input signal. The LOS signal
asserts when the incoming signals fall below a specified loss threshold, and de-asserts when the
line signal rises nominally 2dB above the assert threshold. The threshold is adjustable in SW mode
(HWSEL = High) via the
μ
Processor interface.
2.2.2.3
Fiber Interface
If no transition is detected during any 3112 bit times (20
μ
sec), LOS asserts. LOS is cleared when
two consecutive frame words with no LOS events between then are received. In SW mode
(HWSEL = High) the assertion window is programmable from 128 bits to 4096 bits in four steps.
The deassertion criteria can also be configured to 12.5% transition density. The 12.5% density is
determined by receipt of at least 4 transitions during a 32 bit sliding window.
Figure 4. Criteria for LOS Output
In Frame
4 consecutive frames
with errored FAS
2 consecutive frames
with correct FAS
Out of Frame
Nominal Value
LOS
De-assert
LOS
Assert
Level below nominal
HYS = 3 dB
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