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VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC7140
Features
* Supports ANSI X3T11 1.0625Gb/s, FC-AL Disk Attach for Resiliency * Dual Digital Clock Recovery Units * Dual Digital Signal Detect Units * Dual Port Bypass Circuits * 106.25 or 53.125 MHz Reference Clock
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
* Implements 2 Hub Nodes * Provides Bi-directional Signal Clean-up. * 1.2 W Typical Power Dissipation * 3.3V Power Supply * 52-Pin, 10mm PQFP
General Description
The VSC7140 is a dual Fibre Channel repeater which can be used in Hubs, JBODs or any Fibre Channel Subsystem requiring clean incoming and outgoing signals at a bulkhead connector. The digital Clock Recovery Unit (CRU) recovers incoming data from an external device, amplifies it and attenuates jitter. A digital Signal Detect Unit (SDU) determines whether the incoming signal contains invalid Fibre Channel data. A 2:1 multiplexer forms a Port Bypass Circuit (PBC) to route either recovered incoming data or SI to SO. Fibre Channel subsystems requiring signal cleanup at the bulkhead would connect RX1 to the incoming signal and SO1 to the internal subsystem's input. RX2 would connect to the output of the subsystem and SO2 would connect to the bulkhead. For Hub applications, SI would connect to the previous Hub Node and output data to the external device on TX. Incoming data from the external device on RX is recovered and cleaned up and passed to the next Hub node on SO. If the external device is not functional, SI is passed to SO.
VSC7140 Block Diagram
FAIL1SEL1
SDU1
RX1+ RX1SI1+ SI1ERRSEL SO2+ SO21 0 TX2+ TX2REFSEL REFCLK (106/53 MHz)
CRU1
1
PBC1
SO1+ SO1TX1+ TX1-
0
CRU2 PBC2 SDU2
1 0
RX2+ RX2-
PBC3
SI2+ SI2-
CMU
SEL2 FAIL2HUB
G52180-0, Rev 4.0 10/23/00
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
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VITESSE
SEMICONDUCTOR CORPORATION
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
Data Sheet
VSC7140
Functional Description
The VSC7140 contains two fully integrated repeaters to improve signal quality and determine whether the input to the repeater contains invalid Fibre Channel data. Each repeater consists of a Clock Recovery Unit (CRU) and a digital Signal Detect Unit (SDU). The CRU locks onto the incoming signal, generates a recovered clock (nominally 1.0625 GHz) and uses this clock to resynchronize the incoming signal. The recovered data has improved signal quality due to amplification and jitter attenuation. Recovered data is retimed to the recovered clock, not to the reference clock, REFCLK. The design of the CRU eliminates the need for any Lock-toReference signal since, in the absence of data, the CRU locks onto REFCLK automatically which eliminates the need for any external control. The Signal Detect Units (SDUs) test the recovered data from the CRUs for invalid Fibre Channel data by looking for run length errors (more than 5 consecutive 1's or 0's) and the absence of a seven bit pattern found in the K28.5 character of either disparity (`0000101' or `1111010'). This K28.5 pattern should occur between all valid Fibre Channel frames. The maximum length of a Fibre Channel frame is 2148 bytes (or 21,480 encoded bits) and the SDU divides time into 1-1/2 maximum frames with a 15-bit counter (~31 microseconds). At the end of each interval, any run length or K28.5 errors which occured during the interval are stored internally for use by the state machine which drives the SDU output, FAILn-. The ERRSEL input controls both SDUs while the FAILn- outputs provide the status of each SDU. ERRSEL selects two different modes generated by the SDU; Single Frame (LOW) or Multiple Frame (HIGH) error modes. In Single Frame Error Mode, any error condition that occurs within the 1-1/2 frame interval causes FAILn- to be asserted LOW immediately after that interval. FAILn- remains asserted until immediately after an error free interval. In Multiple Frame Error Mode, FAILn- is asserted after four consecutive intervals containing errors and remains asserted until after four consecutive error-free intervals occur. The intent of the Multiple Frame Error Mode is to allow FAIL1- or FAIL2- to be directly connected to the Port Bypass Circuit controls, SEL1 or SEL2, in order to configure the part to isolate RX1 or RX2 whenever invalid data is present. Single Frame Error Mode allows the user to develop their own algorithm for monitoring data and controlling SEL1 or SEL2. A TTL reference clock, REFCLK, is used by the internal Clock Multiplier Unit (CMU) to generate a baud rate clock (nominally 1.0625 GHz). If REFSEL is HIGH, the CMU multiplies REFCLK (nominally 106.25 MHz) by a factor of 10. If REFSEL is LOW, the CMU multiplies REFCLK (nominally 53.125 MHz) by a factor of 20. The user must ensure that REFSEL is properly set in order to match the frequency of REFCLK. Three Port Bypass Circuits (PBC) contain differential 2:1 muxes operating at 1.0625 Gb/s for routing serial data. SEL1 configures PBC1 to select either the output of CRU1 (HIGH) or SI1 (LOW) to drive SO1. SEL2 configures PBC2 to select either the output of CRU2 (HIGH) or the output of PBC3 (LOW) to drive SO2. HUB configures PBC3 to select either the output of PBC1 (HIGH) or SI2 (LOW) to drive the input to PBC2.
Page 2
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
G52180-0, Rev 4.0 10/23/00
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC7140
Application Examples
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
The VSC7140 is intended for two applications, Dual Repeater or Dual Hub, as configured by HUB. Users needing to retime both incoming and outgoing signals at the bulkhead of a Fibre Channel system would use the part in Dual Repeater Mode (HUB is LOW). Users building Fibre Channel Hubs would use the part in Dual Hub mode (HUB is HIGH) to fully handle the functions of two Hub Nodes.
Dual Repeater Mode In this example, the VSC7140 forms a dual repeater in a complex Fibre Channel system, such as a JBOD (Just a Bunch Of Disks) RAID (Redundant Array of Independent Disks) subsystem, which requires the incoming Fibre Channel signal to be retimed to ensure adequate signal quality to the input of the subsystem. Likewise, the output of the JBOD subsystem requires retiming to ensure that the outgoing signal from the system meets the amplitude and jitter requirements of Fibre Channel. For this application, the dual CRUs are the only circuits required although the SDUs may be used for reporting signal status. Therefore, the VSC7140 would be configured as follows:
HUB is LOW to select Dual Repeater Mode. RX1 connects to the external input from the bulkhead. SO1 connects to the input to the JBOD subsystem. RX2 connects to the output of the JBOD subsystem. SO2 connects to the output to the bulkhead. SI1 and SI2 are not used. Pull up SI1+ and SI2+ to VDD with 22k Ohms to prevent input oscillations. TX1 and TX2 are not used. Leave unconnected. SEL1 and SEL2 are driven HIGH. FAIL1- and FAIL2- may be used for status. ERRSEL is selected as desired by the user.
Figure 1: Block Diagram: Use of VSC7140 in Dual Repeater Mode
VSC7140 Connector
RX1
CRU CRU
SO1
SO2
RX2
Internal Fibre Channel Subsystem
G52180-0, Rev 4.0 10/23/00
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
Page 3
VITESSE
SEMICONDUCTOR CORPORATION
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node Dual Hub Mode
Data Sheet
VSC7140
In this example, the VSC7140 is used to fully implement two adjacent nodes in a Fibre Channel Hub. Incoming external signals on RX require retiming to improve amplitude and eliminate jitter before being used by the Hub. The TX outputs drive the external device. A serial loop is formed by daisy chaining the SI to SO paths of each node. The SDUs are required to configure the Hub to include external devices on the SI/SO loop if they produce valid Fibre Channel data or to exclude them from the loop if they are not operational. HUB is HIGH to select Hub Mode. RX1 connects to the external output from Device #1. TX1 connects to the external input to Device #1. RX2 connects to the external output from Device #2. TX2 connects to the external input to Device #2. SI1 is connected to the SO2 output of the previous VSC7140. SI2 is pulled up SI2+ with 22k Ohms. SO2 is connected to the SI1 input of the next VSC7140. SO1 is left unconnected. If ERRSEL is HIGH, FAIL1- connects to SEL1 and FAIL2- connects to SEL2. If ERRSEL is LOW, FAIL1- and FAIL2- are used by off-chip circuits to control SEL1 and SEL2.
Figure 2: Block Diagram: Use of VSC7140 in Hub Mode
TX1 RX1 TX2 RX2
VSC7140 CRU SDU
FAIL1 SI1
CRU SDU
SEL1
CRU SDU
FAIL2
SO2
CRU SDU
SEL2
Internal Loop
Note: SO1 and SI2 not used.
Page 4
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
G52180-0, Rev 4.0 10/23/00
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC7140
AC Characteristics
Figure 3: AC Timing Diagrams RXn, SIn SOn, TXn TP TP
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
80% 20% TS TS
REFCLK TT TH TT TL T
VIH(MIN) VIL(MAX)
Table 1: AC Characteristics (Over recommended operating conditions). Parameters Description
Differential Inputs/Outputs TP TS TT F FO DC TH , TL Latency from Serial Input (RXn/ SIn) to Serial Output (TXn/SOn) Differential Output Rise/Fall time Reference Clock Requirements REFCLK input rise/fall times REFCLK Frequency Frequency Offset REFCLK Duty Cycle REFCLK Input HIGH/LOW time -- 105 52.5 -200 35 2.5 2.0 108 54 +200 65 -- ns MHz ppm % ns Between VIL(MAX) and VIH(MIN) 106.25 MHz Nom.; REFSEL is HIGH 53.125 MHz Nom.; REFSEL is LOW Maximum frequency offset between 10 or 20 times REFCLK and the datarate of the serial input to the CRU. Measured at 1.5V From VIH(MIN) to VIH(MIN) or VIL(MAX) to VIL(MAX) 0.25 -- 7.0 300 ns ps Between 20% and 80%
Min.
Max.
Units
Conditions
G52180-0, Rev 4.0 10/23/00
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
Page 5
VITESSE
SEMICONDUCTOR CORPORATION
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
Data Sheet
VSC7140
DC Characteristics (Over recommended operating conditions).
Parameters Description Min Typ Max Units Conditions
VIH VIL IIH IIL VOH VOL VDD PD IDD VIN VOUT75 VOUT50
Input HIGH voltage (TTL) Input LOW voltage (TTL) Input HIGH current (TTL) Input LOW current (TTL) Output HIGH Voltage (TTL) Output LOW Voltage (TTL) Supply voltage Power Dissipation Supply current PECL input swing: SIn, RXn PECL output swing: TXn, SOn PECL output swing: TXn, SOn
2.0 0 -- -- 2.4 -- 3.14 -- -- 300 1200 1200
-- -- 50 -- -- -- -- 1.2 365 -- -- --
5.5 0.8 500 -500 -- 0.5 3.47 1.7 490 2600 2200 2200
V V A A V V V W mA mVp-p mVp-p mVp-p -- VIN = 2.4 V VIN = 0.5 V IOH = -1.0mA IOL= +1.0mA VDD = 3.3V + 5% Outputs open, VDD = VDD max Outputs open, VDD = VDD max AC Coupled. Internally biased at VDD/2 75 to VDD - 2.0 V 50 to VDD - 2.0 V
Absolute Maximum Ratings (1)
Power Supply Voltage (VDD) .............................................................................................................-0.5V to +4V PECL DC Input Voltage ......................................................................................................... -0.5V to VDD +0.5V TTL DC Input Voltage....................................................................................................................... -0.5V to 5.5V DC Voltage Applied to TTL Outputs ................................................................................... -0.5V to VDD + 0.5V TTL Output Current ..................................................................................................................................+/-50mA PECL Output Current ................................................................................................................................+/-50mA Case Temperature Under Bias .........................................................................................................-55 to +125oC Storage Temperature.......................................................................................................................-65 to + 150oC Maximum Input ESD (Human Body Model).............................................................................................. 1500 V
Recommended Operating Conditions
Power Supply Voltage.................................................................................................... ....... ...... ........3.3V +/- 5% Ambient Operating Temperature Range...............................................................0C Ambient to +95C Case
Notes: 1) CAUTION: Stresses listed under "Absolute Maximum Ratings" may be applied to devices one at a time without causing permanent damage. Functionality at or above the values listed is not implied. Exposure to these values for extended periods may affect device reliability.
Page 6
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
G52180-0, Rev 4.0 10/23/00
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC7140
Input Structures
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
Two input structures exists in this part; TTL and High Speed, Differential Inputs. The TTL Inputs will interface with any TTL or 3.3V or 5V CMOS outputs. The High Speed, Differential Inputs are intended to be AC Coupled per the FC-PH specification. Being AC Coupled, the High Speed, Differential Input buffers are biased at VDD/2. Refer to Figure 4, Input structures.
Figure 4: Input Structures
VDD +3.3 V
INPUT
Current Limit
GND
REFCLK and TTL Inputs
A
VDD +3.3 V
INPUT
INPUT
All Resistors 3.3K GND
High Speed Differential Input (RXn+/-, SIn+/-)
B
G52180-0, Rev 4.0 10/23/00
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
Page 7
VITESSE
SEMICONDUCTOR CORPORATION
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
Data Sheet
VSC7140
Figure 5: Pin Diagram
Package Pin Descriptions
INC_VDD
INC_VSS
REFCLK
TEST2
TEST1
RX1+
RX1-
VDD
51 REFSEL TEST3 SEL1 VSS VDD INC_VDD VSS VDDA INC_VSS VSS VDD FAIL1FAIL213 15 11 9 7 5 3 1
49
47
45
43
41 39 TX1+ TX137 VDDP SO1+ 35 SO1INC_VSS 33 VSS INC_VSS 31 SO2+ SO229 VDDP TX2+ 27 TX2-
VITESSE
VSC7140QJ
17 19 21 23 25
ERRSEL
VSS
INC_VSS
SEL2
RX2-
VSS
SI2-
INC_VDD
VDD
(TOP VIEW)
NOTE: Heat spreader is not internally connected electrically. It should not be connected electrically by the user.
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(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
RX2+
VDD
HUB
SI2+
VDD
SI1+
VSS
VSS
SI1-
G52180-0, Rev 4.0 10/23/00
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC7140
Table 2: Pin Identification Pin #
46, 45 21, 20 39, 38 28, 27 42, 41 25, 24 36, 35 31, 30 3 15 16 51 1 12, 13 17
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
Name
RX1+, RX1RX2+, RX2TX1+, TX1TX2+, TX2SI1+, SI1-SI2+, SI2SO1+, SO1SO2+, SO2SEL1 SEL2 HUB REFCLK REFSEL FAIL1FAIL2ERRSEL TEST1 TEST2 TEST3 VDD VDDP VDDA VSS INC_VDD INC_VSS
Description
INPUT - Differential. Serial input to CRU1/CRU2. (AC Coupling recommended) (Biased internally at VDD/2) OUTPUT - Differential. Serial output from PBC1/PBC2. (AC Coupling recommended) INPUT - Differential. Serial input. (AC Coupling recommended) (Biased internally at VDD/2) OUTPUT - Differential. Serial output from PBCx to disk drive `x'. (AC Coupling recommended). INPUT - TTL. SEL1 configures PBC1 to select either the output of CRU1 (HIGH) or SI1 (LOW) to drive SO1. INPUT - TTL. SEL2 configures PBC2 to select either the output of CRU2 (HIGH) or the output of PBC3 (LOW) to drive SO2. INPUT - TTL. HUB configures PBC3 to select either the ouput of PBC1 (HIGH) or SI2 (LOW) to drive the input to PBC2. INPUT - TTL. REFerence CLocK at 1/10th or 1/20th the baud rate (Nominally 53.125 or 106.25 MHz) as determined by REFSEL. Used for internal clock multiplier unit. INPUT - TTL. REFclk SELect. When HIGH, REFCLK is 1/10th the baud rate and would normally be 106.25 MHz. When LOW, REFCLK is 1/20th the baud rate (53.125 MHz) OUTPUT - TTL. When LOW, indicates that the output of CRU1/2 contains invalid Fibre Channel data. INPUT - TTL. Selects the algorithm to drive the FAIL1-/FAIL2- outputs. When HIGH, the "Multiple Frame Error Mode" is used. When LOW, the "Single Frame Error Mode" is selected. INPUT - TTL. LOW for factory test, HIGH for normal operation. Power Supply. 3.3V Supply. High-Speed Output Power Supply. 3.3V Supply for PECL drivers. Analog Power Supply. 3.3V for Clock Multiplier PLL. Bypass to pin 7. Ground. Internally Not Connected. Connect these pins to VDD for compatibility with future versions of the VSC7140. Internally Not Connected. Connect these pins to VSS for compatibility with future versions of the VSC7140.
49, 50, 2 5, 11, 19, 26 40, 47 29, 37 8 4, 7, 10, 14 23, 33, 43, 52 6,18,48 9,22,32, 34, 44
G52180-0, Rev 4.0 10/23/00
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
Page 9
VITESSE
SEMICONDUCTOR CORPORATION
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
Data Sheet
VSC7140
Package Information
52 (QJ) PQFP Package Drawing
F G
52 40
Item
1 39
mm 2.45 2.00 0.30 13.20 10.00 13.20 10.00 0.88 0.65 3.56
Tolerance MAX +0.15/-0.10 0.05 0.25 0.10 0.25 0.10 +0.15/-0.10 BASIC 0.50 DIA
A D E
L
I
F
H
G H I
13
27
J K L
14
26
0.30 RAD. TYP.
A
0.20 RAD. TYP .
STANDOFF
0.25 MAX.
0.17 MAX. 0.25 J
0 o - 8o
0.102 MAX. LEAD NON-PLANARITY
E
10o TYP
D
100 TYP
K
Notes: Heat spreader up All units in mm unless otherwise noted Drawings not to scale. Package Drawing #101-224-5 Issue #1
Page 10
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
G52180-0, Rev 4.0 10/23/00
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC7140
Package Thermal Characteristics
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
The VSC7140 is packaged into a thermally-enhanced plastic quad flatpack. This package adheres to the industry-standard EIAJ footprint for a 10x10mm body but has been enhanced to improve thermal dissipation with the inclusion of an exposed copper heat spreader. The package construction is as shown in Figure 6.
Figure 6: Package Cross Section
Copper Heat Spreader Insulator Lead
Wire Bond
Die
Plastic Molding Compound
The thermal resistance for the VSC7140 package is improved through low thermal resistance paths from the die to the exposed surface of the heat spreader and from the die to the leadframe through the heat spreader overlap of the leadframe.
Table 3: 52 PQFP Thermal Resistance
Symbol Description Thermal resistance from junction to case Thermal resistance from case to ambient in still air including conduction through the leads for a non-thermally saturated board. Thermal resistance from case to ambient in 100 LFPM air. Thermal resistance from case to ambient in 200 LFPM air. Thermal resistance from case to ambient in 400 LFPM air. Thermal resistance from case to ambient in 600 LFPM air. Value 2.5 37.0 31.0 28.0 24.0 22.0 Units
oC/W oC/W oC/W oC/W oC/W oC/W
jc ca ca-100 ca-200 ca-400 ca-600
The user must ensure that the maximum case temperature specification (95o C) is not exceeded. Given the thermal resistance of the package in still air, the user may operate the VSC7140 in still air if the ambient temperature does not exceed 32o C (95o C - 1.7W * 37o C/W = 32o C). If operation above this ambient temperature is required, an appropriate heatsink must be used with the part or adequate airflow must be provided.
Moisture Sensitivity Level This device is rated with a moisture sensitivity level 3 rating. Refer to Application Note AN-20 for appropriate handling procedures.
G52180-0, Rev 4.0 10/23/00
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
Page 11
VITESSE
SEMICONDUCTOR CORPORATION
1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node
Data Sheet
VSC7140
Ordering Information
The order number for this product is formed by a combination of the device number and package type.
VSC7140
Device Type VSC7140 - Dual Repeater / Hub Node
QJ
Package Type QJ: 52 Pin Thermally Enhanced PQFP, 10x10 mm Body
Marking Information
The package is marked with three lines of text as shown below (QJ Package):
Pin Identifier
VITESSE
Exposed Heat Spreader
VSC7140QJ
Part Number ####AAAA Package Suffix
Date Code
Lot Tracking Code
Notice
Vitesse Semiconductor Corporation reserves the right to make changes in its products, specifications or other information at any time without prior notice. Therefore the reader is cautioned to confirm this datasheet is current prior to placing any orders. The company assumes no responsibility for any circuitry described other than circuitry entirely embodied in a Vitesse product.
Warning
Vitesse Semiconductor Corporation's products are not intended for use in life support appliances, devices or systems. Use of a Vitesse product in such applications without the written consent is prohibited.
Page 12
(c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com
G52180-0, Rev 4.0 10/23/00

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