Single chip Mbit/s fiber optic twisted pair media converter latency In

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Single chip Mbit/s fiber optic twisted pair media converter latency In

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AL211 Preliminary Fast Ethernet Fiber Media Converter
Single chip Mbit/s fiber optic twisted pair media converter latency Integrated elastic store retiming Supports secondary channel management Full duplex capable Link fault propagation PECL interface Supports Auto-negotiation full duplex Remote fault detection capable Provides support redundant link 80mA drive capability Fabricated CMOS 48-pin PQFP package
AL211 designed media converter applications. intended Mbit/s Fast Ethernet fiber optic twisted pair media converter designs. device also provides PECL interface with media connectors such 1300nm fiber optic modules. AL211 compatible with IEEE 802.3 100Base-FX 100Base-TX standards. integrated media converter provides additional functionality such fault propagation redundant link support that conventional implementations using discrete components typically support. AL211 also provides secondary channel inband management information exchange. AL211 includes: elastic store, scrambler, descrambler functions complete media converter design.
Secondary Channel Data
FIFO Base Receiver Fiber Transmit Module
Clock Recovery
Descrambler
Elastic Store
PECL Driver
Base Receiver
Scrambler
Elastic Store
Clock Recovery
PECL Receiver
Fiber Receive Module
FIFO
Secondary Channel Data
Figure
System Block Diagram
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Table Contents
Descriptions. Functional Description. 100Base-TX 100Base-FX Conversion. 100Base-FX 100Base-TX Conversion. Secondary Channel Full Duplex Application PECL Interface. Elastic Store Scrambler Fault Propagation Redundant Link. 2.9.1 2.9.2 2.9.3 2.10 Receive Link Fault Transmit Link Fault. Redundant Link with Switches Repeater.
Indicators.
Electrical Specifications AL211 Mechanical Data.
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AL211 Preliminary
GND_PLL
TP_PECL
GNDR_TP TPI+ TPIVccR_TP Test2 GNDT_TP TPO+ TPOVccT_TP Test3 UPBIT MSGCLK
Vcc_PLL
Data_off
ENFLP
GNDA
RLED
Rbias
VccA
Xout
VccR_F FIGNDR_F Test1 Reserved GNDT_F FOFVout VccT_F Pause
AL211
SCRen
ES_Foff
LED_link_F
LED_Rcv_F
LED_link_TP
Redun#
Reset#
LED_Rcv_TP
ES_TPoff
DNBIT
Figure
AL211
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AL211 Preliminary
Descriptions
Table AL211 Description
NUMBER NAME GNDR_TP TPI+ TPII/O Receive Ground. 100Base-TX Receiver Input Data. During normal operation, pins receive MLT3 signals connected transformer. When TPPECL pulled high, these pins become PECL level interface. then used interfacing external equalizer chip added distance. Receive Power Supply. Test Pin. Tied normal operation. Tied high force output enable. Transmit Ground. 100Base-TX Transmit Data. During normal operation, pins transmit MLT3 signals connected transformer. When TPPECL pulled high, these pins will transmit PECL NRZI signals interface external equalizer chip. Transmit Power Supply. Test Pin. Tied normal operation. Tied high force output "idle" when link down. Secondary Channel Data Input. Internal pull Secondary Channel Clock. Internal pull Reset Pin. Active low. Internal pull Receiving Activity Output Status Pin. will active when device receiving frames side. open drain driver capable driving 10mA LED. Digital Circuit Power Supply. (+5V) Link Detect Output Status Pin. will when link detected. capable driving 10mA LED. Digital Circuit Ground. Fiber Receiving Activity Output Status Pin. will active when device receiving frames site. output driver capable driving 10mA LED. DESCRIPTION
VccR_TP Test2 GNDT_TP TPO+ TPO-
VccT_TP Test3 UPBIT MSGCLK Reset# LED_Rcv LED_link LED_Rcv_F
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AL211 Preliminary
Table AL211 Description (Continued)
NUMBER NAME LED_link_F DESCRIPTION Indicates Fiber Link Status. steady indicates good fiber link. blinking indicates remote fault detected. indicates fiber link detected. open drain driver capable driving 10mA LED. Redundant Link Output Pin. will asserted (LOW) device either link-fail state senses remote fault condition. Scrambler Enable Port Output. Active high, internal pull Elastic Store Fiber Path Disable. Active high, internal pull down. Elastic Store Fiber Path Disable. Active high, internal pull down. Secondary Channel Data Out. Pause Capability Advertisement Enable. Active high, internal pull Power Supply. (+5V) Leave unconnected. PECL output pins driving fiber optic module. Fiber Transmit Ground. Tied high leave floating. Test Pin. Tied normal operation. Fiber Receive Ground. PECL input pins driving fiber optic module. Fiber Receiver Power Supply. (+5V) Enables Full Duplex Auto-negotiation FLP. Active high, internal pull Assertion this turns port output. Deassertion will enable AL211 pass data port. Internal pull down.
Redun#
SCRen ES_TPoff ES_Foff DNBIT Pause VccT_F Reserved FOFO+ GNDT_F Reserved Test1 GNDR_F FIFI+ VccR_F ENFLP Data_off
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AL211 Preliminary
Table AL211 Description (Continued)
NUMBER NAME RLED DESCRIPTION Transmit Output Drive Control. Tied ground through 12.8K resistor. When this tied high, will disable current mode output driver enable voltage mode driver. Bias Control AL211. Tied ground through 12.8K resistor. Phase Locked Loop Ground. Crystal Connection. This also sources clock output. Crystal Connection. clock used instead crystal, this input clock. Phase Locked Loop Power Supply. Power Down. Active high, internal pull down. Analog Ground. Analog Power. Port PECL Interface Enable. When high, TPI+, TPI-, TPO+, TPO- pins become PECL level interface. also disables MLT3 encoder/decoder. When PECL level interface used, signals expected chip NRZI instead MLT3. Internal pull down.
Rbias GND_PLL Xout Vcc_PLL GNDA VccA TP_PECL
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AL211 Preliminary
12.8K
TP_PECL Reset# TPOTPO+ TPITPI+
Xout
Rbias
RLED DATA ENFLP
FIGNDR_F
AL211
Reserved
FOReserved link VccT_F link Redun# TPoff Foff DNBIT SCRen
Figure
AL211 Typical Application Circuit
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AL211 Preliminary
Functional Description
AL211 contains physical layer interface (PHY) device IEEE 802.3 100Base-TX 100Base-FX networks. contains necessary functions such elastic store driver circuits complete media converter design. device converts MLT3 scrambled symbols from twisted pair (TP) input port into 4B5B NRZI encoded data transmits over fiber media. 4B5B NRZI encoded data from fiber-input port converted scrambled MLT3 symbol stream transmission. AL211 does encode decode 4B5B symbols, therefore errors signaling preserved propagated. addition, benefit "straight-through" conversion that latency 8-bit time (BT). device also supports Far-End Fault Detection (fiber only) Link Status Propagation. port link-fail state, device will cease transmit data disables appropriate output port. essence, device transparent regard connecting links. AL211 provides PECL interface interfacing either equalizer chip fiber module. elastic store provided media converter retime received signal. elastic store disabled reduce latency converter. AL211 supports redundant link applications. redundant link formed either switch with 100Base-FX transceiver that supports far-end fault signaling AL211's. event link-failure, redundant link will established automatically.
Xfmr RJ45
MLT3
AL211
PECL
Module
100BASE-TX 100BASE-FX (1300 media conversion
Module
PECL
AL211
PECL
Module
single mode multimode conversion
Figure
AL211 Applications
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AL211 Preliminary
100Base-TX 100Base-FX Conversion
AL211's 100Base-TX receiver designed data reception maximum meters Category Cable. applications that require full IEEE 802.3 distance (100 meters), AL211 provides PECL interface interface external equalizer chip. However, media converter applications typically within wiring closet. distance meters adequate support these applications. After scrambled MLT3 signal from twisted pair port received AL211, device descrambles signal converts into signal stream. signal then passed through elastic store retiming. resulting signal then converted into serial NRZI stream sent driver. elastic store disabled reduce latency converter. During idle, AL211 will transmit IDLE signal. twisted pair port link-down state, AL211 will cease transmit signal link fault thus propagated.
100Base-FX 100Base-TX Conversion
AL211 100Base-FX receiver comprised scrambler quantizer. After receiving serial stream from amplifier, device passes signal through elastic store retiming converts NRZI coded data into scrambled MLT3 signal sends 100Base-TX transmitter. During idle, AL211 will transmit scrambled IDLE signal. fiber receiver does receive idle signal, fiber port will into link-down state AL211 will perform tasks: Cease transmit signal port transmit port high impedance; Simultaneously start transmitting far-end fault signals. event remote fault (the receiver receives far-end fault signal), receiver will into link-down state. provides remote fault signal status indication. far-end fault signal indicated far-end fault IDLE signal "ones" follow "zero"). When fiber port link-down state (either remote fault receive link-fail), device will output port into high impedance assert Redun# signal.
Secondary Channel
AL211 provides secondary serial communication channel. This serial port intended point point communication link piggybacked Mbit/s data stream over fiber. data input retrieved from AL211's media conversion device serial port. secondary channel data transmitted during normal transmission stream. During idle IPG), AL211 will insert 10-bit code word 8-bit data into transmit data stream. When regular data transmission progress, secondary channel will remain idle. data written into AL211 will stored on-chip FIFO. additional data written into AL211 before stored data been sent, will write over previous data. Figure illustrates secondary channel data format.
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AL211 Preliminary
MSGCLK
Down
Start
Data
Figure
Secondary Channel Data Format
clock rate high MHz, however data rate limited between frame. worst case data rate Kbit/s which based calculation 1518 bytes data interleaved with 8-bit secondary channel data.
Full Duplex Application
ideal function media converter chip provide full duplex transparent media link. However, because 100Base-FX does support auto-negotiation, AL211 propagate duplex information twisted pair media. Although AL211 does support full autonegotiation, provides option force link partner into full duplex mode with autonegotiated link pulses. When (ENFLP) pulled high, AL211 will transmit autonegotiation with Mbit/s full duplex capability field forcing linked unmanaged switch into full duplex.
PECL Interface
AL211 provides PECL interface interface fiber connect interface. intention interfaces allow design engineers able choose other media interconnects such 1300nm fiber module external twisted pair equalizer. AL211 signal detect function built does require interface signal detect input.
Elastic Store
AL211 provides on-chip elastic store. With elastic store place, device retimes received signal removes jitter. elastic store turned reduce latency device using appropriate pins. typical applications such media conversion 100Base-FX hub, where twisted pair length less than meters fiber length less than meters (reference IEEE 802.3 clause fiber length system configuration), retiming needed. full duplex application fiber length over 2km, elastic store should used remove jitter from signal.
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AL211 Preliminary
Scrambler
AL211 also used full duplex media extender 850nm 1300nm media converter turning scrambler off. turn scrambler off, SCRen should connected ground.
Fault Propagation
AL211 will propagate idle signals from media media. After reception idle signal (all "1s"), device will then transmit idle signal opposite ports, i.e. fiber fiber There types link-failure; receive remote fault (also known far-end fault). receive link-failure. event receive link-failure, AL211 will cease transmit idle signal fiber optic driver. valid link signal either 10Base-T link pulse 100Base-TX idle signal. Fiber receive link-failure. event fiber receive link-failure, AL211 will cease transmit idle signal driver driver into high impedance. device will also send remote fault signal fiber optic driver addition asserting Redun# signal. transmit link-failure. event transmit link-failure, far-end transceiver will cease transmit idle signal start transmitting AL211. Since AL211 does understand FLP, will continue transmit idle signal fiber optic driver. Fiber transmit link-failure. event fiber transmit link-failure, far-end transceiver (with remote fault signaling capability) will transmit signal AL211. result, AL211 will perform tasks: cease transmit idle signal driver driver into high impedance asserting Redun# signal.
Redundant Link
AL211 supports redundant link through DATAoff Redun# signals. redundant link function only available port. implementation redundant link shown Figure 1-6. redundant link also configured with fiber switch ports (far-end fault signaling support required) AL211's. There likely scenarios; either transmit link fault receive link fault could trigger redundant link.
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AL211 Preliminary
Transformer FOoff FOoff
Transformer
Local Primary AL211
Primary
Primary AL211
Redun#
Redun#
FOoff
FOoff
Local Back AL211
Back
Back AL211
Twisted Pair
Twisted Pair
Figure
Redundant Link
2.9.1 Receive Link Fault event receive link-failure, receiver will into link-down mode. AL211 will take following actions: Start transmitting remote fault signal; TPO+ TPO- pins high impedance; Assert Redun# signal. far-end primary transceiver normally link-up state back-up transceiver link-fail state. During receive link-failure, local AL211 will enable data transmission backup transceiver asserting Redun# signal. backup AL211 will then start sending copies transmit signal. primary far-end receiver that receives signal will enter link-fail state. back-up transceiver will exit link-fail state upon receiving signal from local AL211 re-establishing link. When primary link repaired, Redun# will de-asserted secondary link will turned re-establishing primary link. During normal operation, backup channel will transmitting idle signals data. Therefore, link integrity status back-up channel available through indicator.
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AL211 Preliminary
2.9.2 Transmit Link Fault 100Base-FX specification provides detect transmit link-failure. Whenever fiber receiver experiences receive link-failure, will transmit far-end fault signal. far-end fault signal indicated far-end fault IDLE signal "ones" follow "zero"). When AL211 receives far-end fault signal, notified far-end station that transmit fault occurred. device will into link-down state will take following actions: TPO+ TPO- pins high impedance; Assert Redun# signal. data transmission will assumed backup AL211 start sending copies signal. Upon re-establishment primary fiber, Redun# will de-asserted backup data link will turned off. 2.9.3 Redundant Link with Switches Repeater Figure shows redundant link implemented pair AL211's fiber switch/repeater. this configuration that transceivers fiber switch must support far-end fault signaling (although IEEE far-end fault signaling option). operation this link configuration very similar AL211 redundant link described above. Instead far-end transceivers being switched, ports switched. Whenever, far-end transceiver receives far-end fault signal IDLE signal, will enter link-fail state. Thus, redundancy accomplished. There limit number redundant links AL211. Also Redun# Data_off signals cascaded many times needs offer more redundant links. minor disadvantage this scenario with switch, that link will functional (spanning tree will port) until addresses stored switch aged out. However, many switches today automatically delete address when there change address. With that feature, link will immediately established.
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AL211 Preliminary
Transformer FOoff
Local Primary AL211
Primary
Redun# 100BaseFX Switch
FOoff
Local Back AL211
Back
Twisted Pair
Figure
Redundant Link Application with Switch
2.10 Indicators
AL211 provides four drivers which consist activity link indicators both fiber. AL211 experiences remote link fault, link (fiber only) will flash second intervals.
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AL211 Preliminary
Fiber
Figure
Fiber Latency
Table Fiber Latency Parameters
PARAMETER DESCRIPTION Fiber latency without elastic store. Fiber latency with elastic store. UNITS
Fiber
Figure
Fiber Latency
Table Fiber Latency Parameters
PARAMETER DESCRIPTION Fiber latency without elastic store. Fiber latency with elastic store. TYP. MAX. UNITS
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AL211 Preliminary
Electrical Specifications
Note: Operation absolute maximum ratings outside those listed could cause permanent damage device.
Table Maximum Ratings
Supply Voltage (Vcc) Input Voltage Output Voltage Storage Temperature -0.5V -0.3 0.3V -0.3 0.3V
+150
Table Recommended Operation Conditions
Supply Voltage Operating Temperature Power Dissipation 0.9W 850nm LED) 0.65W PECL) 0.6W (PECL PECL)
Note: Under Recommended Operating Conditions, Vcc=5.0V 10%,
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AL211 Preliminary
Table Electrical Characteristics
PARAMETER (1)* (1)* (2)* (2)* DESCRIPTION Supply voltage. Output voltage-high, Ioh=24mA. Output voltage-low, Ioh=24mA. High impedance state output current. Input current-high. Input current-low. Input current-high with internal pull down. Input current-low with internal pull down. Input high voltage. Input voltage. Supply current. Receiver input voltage. Transmitter rise time. Transmitter fall time. 0.7*Vcc 0.3*Vcc 1600 UNIT
Note: parameter column indicates digital control signals only.
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AL211 Preliminary
AL211 Mechanical Data
0.22 0.05
7.00 Max.
0.50
7.00 Max.
1.40 0.05
1.60 0.15
Figure 1-10 AL211 Mechanical Dimensions
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AL211 Preliminary
Rev. History Preliminary Corrected system block diagram. Corrected illustration. Updated descriptions (numbers 26-36). Updated typical application circuit.
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Index
Numerics 100Base-FX 100Base-TX Conversion 100Base-TX 100Base-FX Conversion AL211 Applications AL211 Mechanical Data AL211 Description AL211 AL211 Typical Application Circuit Electrical Characteristics Elastic Store Electrical Specifications Fault Propagation Fiber Latency Fiber Latency Parameters Full Duplex Application Functional Description Indicators Maximum Ratings PECL Interface Descriptions Product Description Receive Link Fault Recommended Operation Conditions Redundant Link Redundant Link Application with Switch Redundant Link with Switches Repeater Scrambler Secondary Channel Secondary Channel Data Format System Block Diagram Fiber Latency Fiber Latency Parameters Transmit Link Fault
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Single chip Mbit/s fiber optic twisted pair media converter latency In

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