Sun Netra CP3240 Switch ™ Installation Guide Sun Microsystems, Inc. www.sun.com Part No. 820-3251-13 September 2009, Revision A Submit comments about this document at: http://www.sun.com/hwdocs/feedback...
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U.S. and in other countries, exclusively licensed through X/Open Company, Ltd. Sun, Sun Microsystems, the Sun logo, Solaris, Netra and the Netra logo are trademarks or registered trademarks of Sun Microsystems, Inc., or its subsidiaries, in the U.S. and other countries.
Contents Preface xix Getting Started 1–1 System Requirements 1–2 1.1.1 Connectivity 1–2 1.1.1.1 Hub Connectivity 1–2 1.1.2 Electrical and Environmental 1–2 Unpacking 1–4 Handling Switches 1–4 Connectors 1–5 Jumper Options 1–5 Switch and RTM Faceplates 1–6 1.6.1 Base 10/100/1000 Uplink Ports (RJ-45) 1–7 1.6.2 10/100 Management Port (RJ-45) 1–7 1.6.3...
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Pigeon Point BMR-H8S-AMCc AdvancedTCA IPMI Subsystem 2–7 Protocols, RFCs, and MIBs Support 2–8 2.3.1 FASTPATH Switching 2–8 2.3.1.1 Additional Layer 2 Functionality 2–9 2.3.1.2 System Facilities 2–9 2.3.1.3 Switching MIBs 2–10 2.3.1.4 Routing MIBs 2–10 Sun Netra CP3240 Switch Installation Guide • September 2009...
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2.3.2 FASTPATH Routing 2–11 2.3.3 FASTPATH Quality of Service 2–12 2.3.3.1 DiffServ 2–12 2.3.3.2 Access Control Lists (ACLs) 2–12 2.3.3.3 Class of Service (CoS) 2–13 2.3.3.4 Quality of Service MIBs 2–13 2.3.4 FASTPATH Multicast 2–13 2.3.4.1 Multicast MIBs 2–14 2.3.5 FASTPATH IPv6 Routing 2–14 2.3.5.1 IPv6 Routing MIBs 2–15...
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4–7 4.3.2 e-Keying Bypass 4–8 4.3.3 ATCA LEDs 4–8 Serial Select 4–8 Serial Location 4–9 4.5.1 Changing Serial Location from UBoot 4–9 4.5.2 Changing Serial Location from FASTPATH 4–9 viii Sun Netra CP3240 Switch Installation Guide • September 2009...
Preface The Sun Netra CP3240 Switch Installation Guide describes the installation and configuration of the Sun Netra CP3240 switch. This guide also includes information about software, environment specifications, connectors, and certifications. Before You Read This Document Obtain and read the following documents: Sun Netra CP3x40 Switch Safety and Compliance Manual (820-3505) ■...
Appendix D presents UL, CE, and FCC agency approval and certification information for the switch. Sun Netra CP3240 Switch Installation Guide • September 2009...
Typographic Conventions Typeface Meaning Examples The names of commands, files, Edit your.login file. AaBbCc123 and directories; on-screen Use ls -a to list all files. computer output % You have mail. What you type, when contrasted AaBbCc123 with on-screen computer output Password: AaBbCc123 Book titles, new words or terms,...
Safety Sun Netra CP3x40 Switch Safety 820-3505-xx Online and Compliance Manual The following table lists the documentation that is related to this product. The online documentation is available at: http://docs.sun.com/app/docs/prod/n900.srvr#hic xxii Sun Netra CP3240 Switch Installation Guide • September 2009...
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Application Title Part Number Format Location Latest Netra CT 900 Server Product Notes 819-1180-xx Online information Pointer Doc Netra CT 900 Server Getting Started 819-1173-xx Printed Shipping kit Guide Overview Netra CT 900 Server Overview 819-1174-xx Online Installation Netra CT 900 Server Installation 819-1175-xx Online Guide...
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Please include the title and part number of your document with your feedback: Sun Netra CP3240 Switch Installation Guide, part number 820-3251-13. xxiv Sun Netra CP3240 Switch Installation Guide • September 2009...
C H A P T E R Getting Started This chapter provides information and procedures needed to install and make the Sun Netra CP3240 switch operational. This chapter should be read before using the board. In addition to this chapter, refer to the following safety documentation: Netra CP3X20 Switch Safety and Compliance Manual (820-3505) ■...
Idle, no AMCs All ports linked with RTM, no AMCs All ports linked with RTM, heavy traffic, no AMCs Designed max power with 15W RTM, and 100W 200W shared for all AMC sites Sun Netra CP3240 Switch Installation Guide • September 2009...
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The 48VDC has a tolerance of 0VDC to 75VDC without damage. The switch will operate when 48VDC is 36VDC to 72VDC, inclusive. Caution – Any input voltage outside the range of 0VDC to 75VDC can damage the switch. The switch requires air flow. A minimum of 100 LFM should be kept on the board at all times.
■ Do not use an oscilloscope probe on the components. The soldered pins are easily ■ damaged or shorted by the probe point. Transport a switch in an antistatic bag. ■ Sun Netra CP3240 Switch Installation Guide • September 2009...
Caution – The heat sinks on a switch can be damaged by incorrect handling. Do not touch the heat sinks while installing or removing a switch. Hold a switch only by the edges. If a heat sink is loose or broken, obtain a replacement switch. Caution –...
Switch and RTM Faceplates The following shows the Sun Netra CP3240 switch and the copper RTM (XCP3240H-RTM-CU-Z) and the fiber optic RTM (XCP3240H-RTM-OP-Z). Switch and RTM Faceplates FIGURE 1-1 Copper RTM Fiber Optic Switch Faceplate Sun Netra CP3240 Switch Installation Guide • September 2009...
1.6.1 Base 10/100/1000 Uplink Ports (RJ-45) There are two front panel Base 10/100/1000Base-T Ethernet uplink ports on the faceplate. They are ports number 18 and 19 on the Base network. 1.6.2 10/100 Management Port (RJ-45) There is a 10/100 management Ethernet port on the faceplate. This port can be used to manage the Base and Fabric.
RTM Pressure Drop Versus Airflows (Impedence Curves) The following graphs plot the impedance curves for the RTMs, per PICMG 3.0 requirements. Netra CP3240H-RTM-CU Airflow (Pa) FIGURE 1-2 Netra CP3240H-RTM-CU Airflow (InchesH FIGURE 1-3 Sun Netra CP3240 Switch Installation Guide • September 2009...
Do not remove the rear transition module without first removing the accompanying switch from the front. 1.8.1 Removing a Switch Set Following are the instructions for removing a switch and, if necessary, the accompanying rear transition module. 1-10 Sun Netra CP3240 Switch Installation Guide • September 2009...
1.8.1.1 Removing a Switch From the Front of the Server 1. Move the front cable management bracket to the lower position ( FIGURE 1-6 Front Cable Management Bracket in Lower Position FIGURE 1-6 2. Disengage the injector/ejector mechanisms at the top and bottom of the board to notify software that the board is about to be removed.
If you are not going to replace the rear transition module, you must install a ■ replacement switch or a filler panel to maintain the enclosures shielding and cooling performance. Refer to Section 1.8.2.2, “Installing a Switch” on page 1-14. 1-12 Sun Netra CP3240 Switch Installation Guide • September 2009...
Note – As long as the switch is removed from the slot, and the system is running with only the single remaining switch, you do not have redundancy for that component. Both switches must be installed and running to have redundancy for that component.
The switches can be inserted only in slot 7 or slot 8 in the Netra CT 900 server. 2. Move the front cable management bracket to the lower position ( FIGURE 1-6 3. Remove the filler panel, if necessary. 1-14 Sun Netra CP3240 Switch Installation Guide • September 2009...
4. Prepare the switch by opening its injector/ejector handles ( FIGURE 1-7 5. Carefully align the edges of the board with the guides in the slot. Look into the enclosure to verify correct alignment of the rails in the guides. 6.
Request down the payload. Opening the bottom latch activates this state. Back to 1 Note – A board should be hot-swapped only when the LED is solid blue. 1-16 Sun Netra CP3240 Switch Installation Guide • September 2009...
C H A P T E R Overview This chapter introduces the key features of the switch and RTMs. This chapter includes a product definition, a list of product features, and functional block diagrams with brief descriptions. This chapter can be used to compare the features of the switch against the needs of a specific application.
Part of Sun’s ATCA platform, the Sun Netra CP3240 switch complies with PICMG 3.0 R2.0 ECN002 and PCIMG 3.1 Option 1 and Option 9. The Sun Netra CP3240 switch implements two separate switched networks on a single PCB. By separating the Base and Fabric networks, the Sun Netra CP3240 switch provides a separate control plane and data plane.
Hardware redundant flash for guaranteed flash recovery ■ 10/100BaseTX out-of-band RJ-45 management Ethernet port ■ Front- and rear-access RJ-45 serial management port ■ Full IPv6 support ■ L2 and L3 multicast support ■ Sun Netra CP3240 Switch Installation Guide • September 2009...
2.1.4 AMC Sites Site 1 1000Base-BX to 3.0 network (AMC port 0) is ethernet port 22 ■ Site 2 1000Base-BX to 3.0 network (AMC port 0) is ethernet port 23 ■ Site 2 10GBase-BX to 3.1 network (AMC port 8-11) is ethernet port 16 ■...
Switch Components The following sections list and describe key components of the Sun Netra CP3240 switch. 2.2.1 Broadcom StrataXGS 3 BCM56503 Ethernet Switch The Sun Netra CP3240 switch uses Broadcom StrataXGS 3 BCM56503 for Base Ethernet switching/routing. This chip is an Ethernet switch with 24 1Gigabyte ports and 3 10Gigabyte ports.
Running at 400MHz with only 1 watt of power, the MPC8247 provides high performance with incredibly low power consumption. Paired with the 256MB PC100 SDRAM and 64MB flash, the CPU subsystem of the Sun Netra CP3240 switch is more than enough to handle the switching application and future upgrades.
Protocols, RFCs, and MIBs Support The Sun Netra CP3240 switch features Level7 FastPath 2340 switching software, version 4.4.4 and newer. This software provides layer 2 switching, quality of service, IPv4 routing, IPv6 routing, and IP multicast. 2.3.1 FASTPATH Switching IEEE 802.1ab—Link Level Discovery ■...
Assign matching traffic flow to a specific queue ■ Redirect or mirror (flow-based mirroring) matching traffic flow to a specific port ■ Generate trap log entries (ACL logging) containing rule hit counts ■ 2-12 Sun Netra CP3240 Switch Installation Guide • September 2009...
2.3.3.3 Class of Service (CoS) Direct user configuration of the following: IP DSCP to traffic-class mapping ■ Interface trust mode: 802.1p, IP DSCP, or untrusted ■ Interface traffic-shaping rate ■ Minimum and maximum bandwidth per queue ■ Strict priority versus weighted (WRR/WFQ) scheduling per queue ■...
Industry Standard CLI with the following features: ■ Scripting capability ■ Command completion ■ Context sensitive help ■ User password encryption ■ Multi-session Telnet server ■ TACACS+ ■ Dual firmware image support ■ 2-16 Sun Netra CP3240 Switch Installation Guide • September 2009...
10G XAUI Fabirc Port 20 1G SGMII 10G XAUI The Sun Netra CP3240 switch is paired with either a copper or fiber optic RTM. The following sections describe each RTM. 2-18 Sun Netra CP3240 Switch Installation Guide • September 2009...
Copper RTM XCP3240H-RTM-CU-Z is the Sun Netra CP3240 switch’s copper RTM pairing. This RTM supports all the ports the Sun Netra CP3240 switch provides using 10GBase-CX4 for the 10Gigabyte and 10/100/1000Base-T for the 1Gigabyte ports. Copper RTM Functional Block Diagram...
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XAUI 10GBase-CX4 Fabirc Port 18 None None XAUI 10GBase-CX4 Fabirc Port 19 None None XAUI 10GBase-CX4 Fabirc Port 19 None None XAUI 10GBase-CX4 Fabirc Port 20 None None XAUI 10GBase-CX4 2-20 Sun Netra CP3240 Switch Installation Guide • September 2009...
2.4.2.2 Fiber Optic RTM XCP3240H-RTM-OP-Z is the Sun Netra CP3240 switch’s fiber optic RTM pairing. This RTM supports all the ports the Netra CP3240 switch provides using 10GBase-X for the 10Gigabyte and 1000Base-X for the 1Gigabyte ports. Fiber Optic RTM Functional Block Diagram...
“Base” in this guide. The Base is designed to be the control plane for the shelf. Scaling from 10Mbps to 1000Mbps, the Base interface can accommodate a wide variety of node boards. The Base interface on the Sun Netra CP3240 switch is based around three main components: the Broadcom BCM56503, the Broadcom BCM5464x, and the Freescale MPC8247.
AdvancedTCA sub-specifications. The Sun Netra CP3240 switch is designed to comply with PICMG 3.1 Ethernet/Fibre Channel for AdvancedTCA Systems, options 1 and option 9. That means the Sun Netra CP3240 switch provides a single 1/10Gigabyte port to each node board.
PICMG AdvancedMC AMC.0 defines hot-swappable daughter cards to be used in PICMG architectures. The Sun Netra CP3240 switch supports three AMC sites so that the functionality of the Sun Netra CP3240 switch can be expanded. AMC.2 (Ethernet) AMCs are supported with direct connections to the Base and Fabric subsystems.
AMC Ethernet Port Availability TABLE 2-7 Slot Location 1G Infrastructure 10G Infrastructure AMC 1 1G Base SGMII None AMC 2 Middle 1G Base SGMII XAUI from BCM56800 Fabric Port 16 AMC 3 Bottom 1G Base SGMII None AMC Site 1: AMC.0 Mid-size, AMC.2 Type E1, AMC.2 Type 5 (Optional), TABLE 2-8 LED Module Support Port...
AMC Site 3: AMC.0 Mid-size, AMC.2 Type E1, Master Clock Generator TABLE 2-10 Support, LED Support Port Type Connected Base (3.0) switch Port 1 of AMC #2, usually used for GB Port 2 of AMC #2, usually used for SAS/SATA Port 2 of AMC #1, usually used for SAS/SATA Not connected Not connected...
C H A P T E R Configuring Jumper Settings This chapter describes jumper settings for configuring the switch. Other configuration options are software controlled. Software configuration options are described in Chapter This chapter contains the following topics: Section 3.1, “Jumper Settings” on page 3-2 ■...
P4 Cross-Connect Jumper Settings TABLE 3-2 Default Function Software control of cross connect. Default Force cross connect enabled, base channel 1 is two 10/100BaseTX ports. No cross connect; base channel 1 is 10/100/1000Base-T. Sun Netra CP3240 Switch Installation Guide • September 2009...
3.1.2 P6(1-2) Fabric Zero Reset Configuration Word This jumper is used to configure the Fabric Gigabyte CPU to use the default Reset Configuration Word, or use the one in the flash. P6 (1-2) Fabric Zero Reset Jumper Settings TABLE 3-3 P6(1-2) Default Function...
3.1.8 P10(3-4) IPMC FWE These are reserved and should be left configured for the default setting. P10 (3-4) IPMC FWE Reserved Jumper Settings TABLE 3-9 (3-4) Default Function Default Normal operation 3.1.9 P11(1-2) Forced-Board Enable This jumper controls whether the switch is forced on when it is powered up, or if the IPMI subsystem controls the power up of the switch.
P13 Serial Direction Jumper Settings TABLE 3-13 Default Function Default Software control of serial direction. Front serial port active; RTM serial port disabled. Front serial port disabled; RTM serial port active. Sun Netra CP3240 Switch Installation Guide • September 2009...
C H A P T E R Configuring Switch Software This chapter describes how to configure the switch software. The switch incorporates four main software components: IPMI firmware, which runs on a separate microcontroller. ■ uBoot loads the boot for the system. It can be compared to a BIOS on a node ■...
Fabric Early* State Fabric firmware Asserted indicates Uboot signal prompt Fabric Full* State Fabric firmware Asserted indicates Linux has signal booted Fabric Good* State Fabric firmware Asserted indicates FASTPATH signal has loaded Sun Netra CP3240 Switch Installation Guide • September 2009...
*These sensors represent the software state of the switch. The following tables lists the logic that drives these sensors. IPMI Sensor Logic TABLE 4-3 State Timeout Failover Condition Early Full Good Initial power-on state 5 sec Uboot corrupted or erased uBoot initial state 5 sec Uboot finds no...
Site 1 Thresh AMC Slot Volts 3.456 3.514 Managem ent Pwr Site 2 Thresh AMC Slot Amps 6.023 6.517 current sense Site 2 Thresh AMC Slot Volts 13.048 13.44 13.608 +12V Sun Netra CP3240 Switch Installation Guide • September 2009...
IPMI Thresold Sensors (Continued) TABLE 4-4 Lower Upper Sensor Name Type Description Units Thresholds Thresholds Site 2 Thresh AMC Slot Volts 3.456 3.514 Managem ent Pwr Site 3 Thresh AMC Slot Amps 6.023 6.517 current sense Site 3 Thresh AMC Slot Volts 13.048 13.44...
To re-enable e-Keying clear the variable. set noekey After changing the environment variables you must always save if you would like the change to persist though a reset. Sun Netra CP3240 Switch Installation Guide • September 2009...
4.2.3 Serial-Baud Rate Control in uBoot You can change the serial baud rate from within FASTPATH, the boot menu, or in uBoot. Changing it in uBoot is the only method that allows it to persist through a reset. Only standard baud rates are accepted. Note –...
(switch Base) # (and then ENTER is pressed here) (switch Base) #[Fabric] (and then ENTER is pressed here) (switch Fabric) #[ Base ] (switch Base) # User: Sun Netra CP3240 Switch Installation Guide • September 2009...
Serial Location The switch supports running its serial port to both the front panel and the RTM. It does not support both the front panel and RTM at the same time. You must configure the port to go to the location needed. By default, the port is routed to the front panel.
The switch takes approximately 50 seconds to boot to a console and be fully functional. 4.6.1 Boot Utility Menu There is a utility menu that can be used before FASTPATH boots. During boot there is a two-option menu displayed for five seconds. This menu allows access to the utility menu if you press number 2 and Enter.
■ from an image over the serial port ■ The default option is booting from the flash. See Section 4.9, “Network Boot” on page 4-14 for more information. 4-12 Sun Netra CP3240 Switch Installation Guide • September 2009...
4.6.1.5 Start Diagnostic Application This option boots the Broadcom diag shell, currently SDK version 5.4.1. This environment is provided as is, with no support. Several commands provided in this shell are not supported and will not work. This shell is provided mainly for debug, testing, and diagnostics purposes.
7. Press number 3 to select network as the boot method. 8. Enter the information for your TFTP server. For host IP, you can enter dhcp if you would like to use DHCP to obtain a valid IP address. 4-14 Sun Netra CP3240 Switch Installation Guide • September 2009...
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9. Press number 1 to boot the system. Example Console Output CODE EXAMPLE 4-5 CPU: 400 MHz DRAM: 256 MB FLASH: 64 MB, Base, Primary Flash ### JFFS2 loading 'image1' to 0x400000 Scanning JFFS2 FS: . done. ### JFFS2 load complete: 10026500 bytes loaded to 0x400000 Booting ...
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Example Console Output (Continued) CODE EXAMPLE 4-5 Select option (1-13): 1 Creating tmpfs filesystem on tmpfs for download...done. Bringing up eth0 interface...done. HOST IPADDR=10.10.2.246 Transferring '/switch.1.0.1.0.stk' from '10.10.3.199' via ftp...done. Bringing down eth0 interface...done. Extracting Application...done. Destroying tmpfs filesystem on tmpfs...done. Loading Application...done.
Many commands have a no form. The no form is used to disable the command. With the previous example, to re-enable port 17, once you are in the interface 17 mode, you would issue the no shutdown command. 4-18 Sun Netra CP3240 Switch Installation Guide • September 2009...
4.10.2 Basic CLI Commands Basic CLI Commands TABLE 4-6 Command Function Mode Switch to privilege mode. You must be in enabled default enable mode for most options. Show status of the ports. privilege show port all Show detailed statistics on port 0/x. privilege show interface ethernet 0/x Clear all statistics.
Web Interface Defaults The username and password are the same as the CLI. The web interface is enabled by default. Java is enabled by default. HTTPS is disabled by default. 4-20 Sun Netra CP3240 Switch Installation Guide • September 2009...
4.10.3.3 SNMP Defaults SNMP is enabled by default. The default read-only community string is public. The default read-write community string is private. 4.10.4 Secure Remote Access 4.10.4.1 SSH and SSL/TLS Keys The switch supports SSH for a secure CLI console as well as SSL/TLS for secure HTTP.
Contact Sun if you would like a non-standard port order. Sun’s port ordering is shown in the following table for shelves with middle hub slots, that is, slots 7 and 8. Port Order List TABLE 4-7 Shelf Physical Slot Base Port Fabric Port 4-22 Sun Netra CP3240 Switch Installation Guide • September 2009...
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Port Order List (Continued) TABLE 4-7 Netra CP3240 Netra CP3240 ShMC 1 none ShMC 2 (if cross connect) none Note – If ports are ordered the same as the ATCA channels, Base and Fabric are always one number off. So, if a board is in slot 6, it is connected to Base channel 3 and Fabric channel 2.
■ 4.11.2 Firmware Upgrades For up-to-date instructions on upgrading the firmware packages, refer to the following documentation: Netra CP32X0 Product Notes (820-3260) ■ README files within the download package ■ 4-24 Sun Netra CP3240 Switch Installation Guide • September 2009...
4.12.2 Backplane Ports Versus RTM Optical Ports The Sun Netra CP3240 switch’s backplane ports are capable of auto-negotiating between 1G and 10G speeds without any user input. However, the RTM optical ports must be explicitly configured without auto-negotiation for 1G operation. This requirement is due to the underlying technology used in 10G interfaces.
RTM on Fabric. Valid entries are 0/17, 0/18, <0/xx> 0/19, and 0/20. For each port on the RTM, enter the command. 4-26 Sun Netra CP3240 Switch Installation Guide • September 2009...
A P P E N D I X Environment Specifications This appendix describes the electrical, environmental, and mechanical specifications. It includes connector descriptions and pin outs, as well as illustrations of the board dimensions and connector locations.
*The MTBF will be significantly reduced if operated above 45˚ C for more than 96 consecutive hours. **The MTBF will be significantly reduced if operated above 30˚ C for more than 96 consecutive hours. Sun Netra CP3240 Switch Installation Guide • September 2009...
A.2Reliability Reliability prediction was done using Issue 6, Method I, Case 3 of the Bellcore Industrial Reliability program. The prediction assumed 25% operating temperature with 100% duty cycle, in a ground benign, controlled environment. MTBF: 122,173 hours ■ 2-year limited warranty ■...
TXD and RXD signals, as both the PC and switch are DTE. The minimum cable pinout is listed in the following table. Minimum Serial Cable Pinouts TABLE B-9 RJ-45 RXD to TXD TXD to RXD GND to GND B-10 Sun Netra CP3240 Switch Installation Guide • September 2009...
A P P E N D I X Datasheet Reference This appendix provides links to datasheets, standards, and specifications for the technology designed into the switch. IEEE 802.3-2002 CDMA/CD (Ethernet) and Other IEEE 802.3/802.1 Documents This document defines Ethernet and several of the protocols used in Ethernet. Any 802 document can be obtained for free six months after it has been published, or, for a fee, a document can be obtained right after it is published.
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MPC8272 PowerQUICC II Family Reference Manual This and other Freescale documents about the MPC8247 are available at: http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code= MPC8247 IETF RFCs The IETF makes all RFCs freely available on their website: http://www.ietf.org/ Sun Netra CP3240 Switch Installation Guide • September 2009...
The final system configuration must be reconsidered as a whole per these directives. NEBS/ETSI The Sun Netra CP3240 switch and RTM has been designed to meet or exceed: Telcordia specification FR-2063 Issue 2 Dec 2002 “Network Building ■...
Emissions Test Regulations FCC Part 15, Subpart B Class A Commercial Equipment ■ Industry Canada ICES-003 Class A Commercial Equipment ■ CISPR 22/EN 55022:1998 Class A Radiated, Power line Conducted ■ Telcordia GR-1089-CORE EMC For Network Telecommunication Equipment Issue ■ 4 Jun 2006 (Designed to meet Sections 2 and 3) D.4.1 EN 50081-1 Emissions...
This switch complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference. 2. This device must accept any interference received, including interference that may cause undesired operation. Sun Netra CP3240 Switch Installation Guide • September 2009...
D.5.2 Industry Canada (Canada) This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations. Operation is subject to the following two conditions: 1. This device may not cause harmful interference. 2. This device must accept any interference received, including interference that may cause undesired operation.
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Sun Netra CP3240 Switch Installation Guide • September 2009...
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