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Table Of Contents
Cisco BTS 10200 Softswitch Cabling and IRDP Procedures
for Medium Hardware Platform Netra 20 OptionConnecting Power and Grounding Cables
Connecting Ethernet Cables to EMS and CA Units
Connect External Network Uplink Cables to Ethernet Switches
Connecting Serial Cables to Alarm Panel or Terminal Server
Procedure for Use with Third-Party Terminal Server or Alarm Panel
Procedure for Use with Continuous Computing Intelligent Alarm Panel
Enable IRDP on the Cisco BTS 10200 Softswitch
Enable IRDP on Adjacent Cisco Routers
Appendix C: Translated Safety Warnings
Statement 1071—Warning Definition
Statement 1024—Ground Conductor
Obtaining Technical Assistance
Obtaining Additional Publications and Information
Cisco BTS 10200 Softswitch Cabling and IRDP Procedures
for Medium Hardware Platform Netra 20 OptionFeature History
This feature module is intended for use by service provider engineering and field personnel who are responsible for designing, installing, configuring, and maintaining networks that use the Cisco BTS 10200 Softswitch. The procedure in this feature module describes how to cable one type of Cisco BTS 10200 Softswitch. This document is in addition to other Cisco BTS 10200 Softswitch documents that describe how to install and operate the system. Contact your Cisco account team for the documentation applicable to your specific system.
Scope and Purpose
This procedure is applicable to Cisco BTS 10200 Softswitch systems that are installed on the medium hardware platform using four Netra 20 hosts purchased in a reference sale—two for the Element Management System (EMS) and two for the Call Agent (CA). In a reference sale, the service provider purchases host machines directly from the manufacturer, based on a reference specification provided by the Cisco account team. The Netra 20 units are available with either AC or DC power.
Note
This hardware is different than the Continuous Computing medium platform hardware supplied by Cisco in a direct turnkey sale (in which Cisco provides both the hardware and the software, fully integrated and configured at the factory).
Note
Documentation for the Sun Netra 20 server is available on the Sun Microsystems website, www.sun.com. These documents include front and rear views of the equipment, and instructions for power cabling and general signal cabling.
The reference sale also requires two customer supplied Cisco Catalyst 2924M XL Fast Ethernet switches. In addition, you must have an appropriate power distribution unit and an (optional) alarm panel in your rack.
The purpose of this procedure is to explain how to:
•
Cable a new Cisco BTS 10200 Softswitch system
•
Enable Internet Control Protocol (ICMP) Router Discovery Protocol (IRDP) functionality on the Cisco BTS 10200 Softswitch and on the Cisco routers adjacent to the Cisco BTS 10200 Softswitch
Note
This procedure is not applicable to systems with Continuous Computing hardware, nor to systems using Sun MIcrosystems SunFire V120 or Netra 120 hardware. If you are using Continuous Computing hardware, use the Cisco BTS 10200 Softswitch Cabling and IRDP Procedures for Medium Hardware Platform AXmp/AXi Option. If you are useing SunFire V120 or Netra 120 hardware, use the Cisco BTS 10200 Softswitch Cabling and IRDP Procedure for Small Hardware Platform.
CautionDo not use this procedure to change the cabling of an in-service Cisco BTS 10200 Softswitch, because that will cause interruption of service. It you need to change the cabling of in-service system, you must first contact your network administrator or your Cisco account team for a procedure.
Before You Start
Before you start cabling the system, perform the following verifications.
1.
Verify that the hosts are already mounted in the rack according to manufacturer instructions, and labeled appropriately. Your system should have the following hardware units:
–
EMS Side A
–
EMS Side B
–
CA Side A
–
CA Side B
–
Cisco 2924M Ethernet Switch A
–
Cisco 2924M Ethernet Switch B
–
Power distribution unit (DC systems)
–
Terminal server or alarm panel (if specified in your local documentation)
2.
Ask your supervisor or an authorized power installer to verify that appropriate power feeds are available, as defined in the site survey documentation for your system. The electrical power for your system must come from two separate (redundant) sources, so that a single point of failure does not cause a complete system outage.
Network Diagram
Figure 1 shows the physical interfaces and network connections.
Figure 1 Network Diagram
Acronyms and symbols used in Figure 1:
EMS/BDMS = Element Management System/Bulk Data Management System
CA/FS = Call Agent/Feature Server
EMSA = EMS/BDMS Side A; EMSB = EMS/BDMS Side B
CAA = CA/FS Side A; CAB = CA/FS Side B
OMS Hub = communication interfaces between EMS/BDMS and CA/FS over OMS Hub
VoIP = Voice over IP signaling
* = Physical IP address
** = Logical IP addressNotes for Figure 1:
1.
For the Netra 20 host machines, NET 0 represents the built-in Ethernet port labeled as <--->10/100 on the rear panel of the machine, and NET 1 represents the top qfe0 port in the PCI slot. (When the top qfe port (qfe0) is operational, the green light labeled LINK/ACT 0 should be on.)
2.
The IP addresses shown in the figure are for illustration purposes only. IP address examples that begin with 10.89 indicate externally viewable addresses, and those beginning with 10.10 indicate internal nonroutable addresses. The actual IP address data for each Cisco BTS 10200 Softswitch is in the Network Information Data Sheet that was supplied with your specific system.
3.
"To external NEs" refers to any of the following links in the service provider network:
•
Uplinks for external access to hosts, used for management services (via SSH, SFTP, and so forth) and outbound billing data (via FTP)
•
Uplinks for external communications, used for connection to external NEs and DNS services via IRDP-enabled network
Note
NE = Network element
SSH = Secure shell
SFTP = Secure file transfer protocol (FTP)
DNS = Domain name server
IRDP = Internet control message protocol (ICMP) router discovery protocol4.
To support full system redundancy, it is necessary to connect the two external uplinks to separate routers as shown in Figure 1. Furthermore, the routers must be connected to separate networks with diverse routing paths to the applicable external NEs and services (such as OSS, DNS, media gateways, and announcement servers).
CautionIf each of the external uplinks is not connected as described in Note #3, a single point of failure could cause a traffic interruption.
5.
To ensure redundancy of the DNS lookup function in the event of a network outage, it is strongly recommended to have two DNS servers reachable via separate networks with diverse routing paths.
CautionIf both DNS servers become unreachable, a traffic interruption will occur.
Connecting Power and Grounding Cables
Documentation for the Netra 20 server is available on the Sun Microsystems website, www.sun.com. These documents include front and rear views of the equipment, and instructions for power cabling and grounding.
Note
Cisco strongly recommends that you use uninterruptible power for both AC and DC systems. The uninterruptible supply should be engineered to support system operation through any possible power interruption.
Step 1
Following the procedures and precautions in the Sun Microsystems documentation, an authorized power installer should connect power and grounding cables to the four host machines.
CautionEnsure redundancy of power feeds to your system, so that a single point of failure does not cause a loss of traffic:
For AC systems, power Side A hosts from a separate power source than Side B.
For DC systems, power each host from two separate (redundant) DC power feeds.
Step 2
Following the procedures and precautions in the Cisco Systems documentation, an authorized power installer should connect power and grounding cables to the two Cisco 2924M Ethernet switches.
CautionEnsure redundancy of power feeds to your system, so that a single point of failure does not cause a loss of traffic:
For AC systems, power Ethernet Switch A from a separate power source than Ethernet Switch B.
For DC systems, power each Ethernet Switch from two separate (redundant) DC power feeds.
Labeling the Ethernet Cables
Two Ethernet cables are supplied with each host machine. Make sure that all of the Ethernet cables are correctly labeled before you begin. It is suggested that you label the cables according to the procedure in Appendix A: Cable Labeling and Table 1 in Appendix B: Cable Lists.
Connecting Ethernet Cables to EMS and CA Units
Follow these steps to connect the Ethernet cables from the host machines (EMS and CA) to the Ethernet switches.
Step 1
Obtain the 4 Ethernet cables needed for connections between EMS Sides A and B and the two Cisco 2924M Ethernet Switches A and B. These cables are listed in Table 1 in Appendix B: Cable Lists.
Step 2
Connect these 4 Ethernet cables between the ports on the rear panel of the EMS units and the ports on the front of the Ethernet switches as specified in Table 1.
Step 3
Obtain the 4 Ethernet cables needed for connections between CA Sides A and B and the two Cisco 2924M Ethernet Switches A and B. These cables are listed in Table 1.
Step 4
Connect these 4 Ethernet cables between the ports on the rear panel of the CA units and the ports on the front of the Ethernet switches as specified in Table 1.
Step 5
After installing the Ethernet cables, record the necessary information on a copy of Table 1 or similar document according to local procedures.
Connect External Network Uplink Cables to Ethernet Switches
External network uplink cables are customer supplied. Follow these steps to connect uplink cables to the Ethernet switches.
Note
If your local network documentation calls for gigabit Ethernet, contact Cisco TAC for assistance.
Step 1
If your local network documentation calls for 100 Mb Ethernet, connect the applicable network uplink cables to the Ethernet Switches as listed in Table 1.
Step 2
After installing the uplink cables, record the necessary information on a copy of Table 1 or similar document according to local procedures.
Connecting Serial Cables to Alarm Panel or Terminal Server
Remote management of the Cisco BTS 10200 requires serial cables connected from the four host machines and two Ethernet Switches to a terminal server. If specified in your local work order, connect these serial cables using the steps in this section. Note that some commercially available alarm panels have built-in terminal server capability.
CautionThe serial cables used in this procedure are not reversible. Be sure to label and connect the ends as specified.
Note
The Netra 20 host machines allow alarm messages to be transmitted from the lights-out management port (LOM SERIAL port) on the rear panel. However, the Cisco BTS 10200 Softswitch software does not currently transmit machine alarms through this port. Instead, machine alarms are sent via alarm reports, as described in the Cisco BTS 10200 Softswitch Opertaions, Maintenance, and Troubleshooting Guide.
Tip
See the Sun Microsystems documentation for instructions on using the LOM features.
Procedure for Use with Third-Party Terminal Server or Alarm Panel
This procedure is applicable if your terminal server or alarm panel is not the Continuous Computing Intelligent Alarm Panel. If you are using a Continuous Computing Intelligent Alarm Panel, see the "Procedure for Use with Continuous Computing Intelligent Alarm Panel" section.
Step 1
Obtain the four serial cables that connect the lights-out management port (LOM SERIAL port) of the Netra 20 host machines and an alarm panel or terminal server. If these cables have not been provided, see Step 2.
Step 2
If necessary, make one serial cable for each Netra 20 host machine. Follow the procedures in the Sun Microsystems documentation and the terminal server documentation. It is suggested that you label the cables according to the procedure in Appendix A: Cable Labeling and Table 1 in Appendix B: Cable Lists.
Step 3
Connect a serial cable between the LOM SERIAL port of each Netra 20 host machine and the alarm panel or terminal server. Follow the procedures in the Sun Microsystems documentation and the terminal server documentation.
Step 4
Obtain the two serial cables that connect the CONSOLE port of each Cisco 2924M Ethernet Switch to the alarm panel or terminal server. If these cables have not been provided, see Step 5.
Step 5
If necessary, make one serial cable for each Cisco 2924M Ethernet Switch. Follow the procedures in the Ethernet switch documentation and the terminal server documentation. It is suggested that you label the cables according to the procedure in Appendix A: Cable Labeling and Table 1 in Appendix B: Cable Lists.
Step 6
Connect a serial cable between the CONSOLE port of each Cisco 2924M Ethernet Switch and the alarm panel or terminal server. Follow the procedures in the Ethernet switch documentation and the terminal server documentation.
Step 7
Record the necessary information on a copy of Table 1 or similar document according to local procedures
Procedure for Use with Continuous Computing Intelligent Alarm Panel
This procedure is applicable if your terminal server or alarm panel is the Continuous Computing Intelligent Alarm Panel. If you are using a different terminal server or alarm panel, see the "Procedure for Use with Third-Party Terminal Server or Alarm Panel" section.
The rear view of the Continuous Computing Intelligent Alarm Panel is shown in Figure 2. (The drawing is not to scale.)
Figure 2 Rear View of Continuous Computing Intelligent Alarm Panel
Step 1
Obtain the four serial cables that connect the lights-out management port (LOM SERIAL port) of the Netra 20 host machines and the Alarm Panel. These cables are listed in Table 2 in Appendix B: Cable Lists.
Step 2
Connect a serial cable between the LOM SERIAL port of each Netra 20 host machine and the Alarm Panel serial ports as specified in Table 2.
Note
The four LOM serial cables are specially designed for the connecting the LOM ports on the Netra 20 to the SER ports on the Alarm Panel. Be sure to use the correct cables and connect them as labeled (LOM end and SER end must be connected as labeled).
Step 3
Obtain the two serial cables that connect the CONSOLE port of each Cisco 2924M Ethernet Switch to the Alarm Panel. These cables are listed in Table 2 in Appendix B: Cable Lists.
Step 4
Connect a serial cable between the CONSOLE port of each Cisco 2924M Ethernet Switch and the Alarm Panel serial ports as specified in Table 2.
Note
The two CONSOLE serial cables are specially designed for the connecting the CONSOLE ports on the Cisco 2924M Ethernet Switches to the SER ports on the Alarm Panel. Be sure to use the correct cables and connect them as labeled (SWITCH end and SER end must be connected as labeled).
Note that in some earlier installations, these cables were labeled "SWITCH" and "net CCN", where net CCN is treated the same as SER.Step 5
Record the necessary information on a copy of Table 2 or similar document according to local procedures.
Enable IRDP
This section explains how to enable IRDP functionality on the Cisco BTS 10200 Softswitch and on the network router.
Note
IRDP = Internet control message protocol (ICMP) router discovery protocol.
Enable IRDP on the Cisco BTS 10200 Softswitch
Follow these steps to enable IRDP on the Cisco BTS 10200 Softswitch.
Note
You should already have the Cisco BTS 10200 Softswitch application software installed on the system.
Step 1
Log in to EMS Side A as root user.
Step 2
Remove the defaultrouter file from /etc.
Step 3
There should be three default routes in the routing table. Remove all three of these with the following command:
route delete net default <gateway address>
Step 4
Execute the following command:
/usr/sbin/in.rdisc -s -f
Step 5
Edit S69inet and search and replace for rdisc -s with rdisc -s -f.
Note
This will ensure that reboot will enable the irdp daemon.
Step 6
Put the following lines into the S68inet file:
if [ -f /usr/sbin/in.routed ];
then
\mv -f /usr/sbin/in.routed /usr/sbin/in.routed.org
Step 7
Repeat Step 1 through Step 6 for EMS Side B.
Step 8
Repeat Step 1 through Step 6 for CA Side A.
Step 9
Repeat Step 1 through Step 6 for CA Side B.
Enable IRDP on Adjacent Cisco Routers
If you are enabling IRDP on Cisco routers adjacent to the Cisco BTS 10200 Softswitch, follow these steps. If you have any questions about setup of these routers, contact your system administrator. If you need additional assistance, contact Cisco TAC.
Step 1
Verify that you have the Network Information Data Sheet (NIDS) applicable to this Cisco BTS 10200 Softswitch. If necessary, contact your network administrator to verify that you have the correct NIDS.
Step 2
On default gateway interfaces for Network 1 and Network 2 (as defined in the NIDS) enable IRDP using the following commands:
config t
interface <Fast Ethernet interface number (see NIDS)>
ip irdp
ip irdp maxadvertinterval 4
ip irdp minadvertinterval 3
ip irdp holdtime 10
Step 3
Validate the configuration by performing the following command on both CA/FS hosts and both EMS hosts:
login as root
#netstat -rn
Step 4
View the display and verify that each default route was populated dynamically by IRDP.
Verify IRDP Functions
Follow these steps to verify that IRDP is functioning properly on the network:
CA Side A
Perform Step 1 through Step 11 on CA Side A.
Step 1
Login to CA Side A as root.
Step 2
Display the IRDP daemon status by entering the following command:
ps -ef|grep in.rdisc
Step 3
View the display and verify that each default route was populated dynamically by IRDP. The display should include the following information: /usr/sbin/in.rdisc -s -f. (This indicates that IRDP is running properly.)
Step 4
Display the routing table by entering the following command:
netstat -rn
Step 5
Verify that the routing table shows two default routes, one on interface NET 0 and one on NET 1.
Step 6
Unplug the interface NET 0 link at the back of CA Side A.
Step 7
Display the routing table by entering the following command:
netstat -rn
Step 8
Verify that the route for interface NET 0 does not appear in the routing table.
Note
When a link is unplugged or plugged back in, it may take 5 to 10 seconds for the IRDP function to automatically update.
Step 9
Plug the interface NET 0 link back in to CA Side A.
Step 10
Display the routing table (netstat -rn) and verify that the route for interface NET 0 appears in the routing table again.
Step 11
Repeat Step 6 through Step 10 for the interface NET 1 link.
CA Side B
Repeat Step 1 through Step 11 for CA Side B.
Verify Interfaces
Follow these steps to verify that all interfaces are configured on all computing elements:
Step 1
If the Cisco BTS 10200 Softswitch application software has already been installed on the system, go to Step 2. If the application has not been installed, go to Step 4.
Step 2
(If the Cisco BTS 10200 Softswitch application software has already been installed on the system) check the interface configurations using the following command on each of the four platforms (two EMS units and two CA/FS units):
Enter: checkCFG
Step 3
The system should display the message Validating..... If no errors are found during validation, the system will display the message No errors found. Verify that the No errors found message is displayed.
Note
If the system does display an error, contact Cisco TAC for assistance.
Step 4
If the Cisco BTS 10200 Softswitch application software has not been installed on the system, install the application using the Application Installation procedure provided by Cisco. That procedure contains the appropriate commands to check the configurations (checkCFG).
Appendix A: Cable Labeling
Cables are labeled at both ends with the cable numbers listed in Table 1 and Table 2, as applicable. Follow these steps to create and attach the labels.
Note
The steps in this section are not necessary for any cables that were provided with your system and have already been labeled.
Step 1
Make each label by copying the applicable number from Table 1 (or Table 2) onto the label. Be sure to duplicate the number several times onto the label, as shown in Figure 3, to make it easier to read. (If desired, make the labels for all cables in one print run.)
Step 2
On a work bench or assembly table, position a cable so that one connector is on your left and the cable goes off to the right. (See Figure 3.)
Step 3
Attach the appropriate label to the cable as shown in Figure 3.
Step 4
Turn the cable around so that the other connector is on your left with the cable going off to the right.
Step 5
Repeat Step 2 and Step 3 for this side of the cable. The completed cable should look like the example shown in Figure 4.
Step 6
Repeat these steps for all cables in the rack, using the numbers from the cable lists (Table 1 and Table 2 as applicable).
Figure 3 Labeling Specification
Figure 4 Completed Cable Example
Appendix B: Cable Lists
Table 1 lists the ports and cables used for signaling and system management. Make a copy of this table for your records. It is recommended that you sign or check each box in the Verified column as you connect the cables. Store this completed table in the documentation package for this unit.
Note
This table does not include the power, grounding, or alarm panel cabling. For those cables, follow the procedures and precautions in the manufacturers' documentation.
Table 1 List of Signaling and System Management Cables (See Procedure for Details)
From (Unit, Port) To (Unit, Port) Suggested
Cable No. VerifiedCA-A Ethernet 1
SWITCH-A 1
#701
CA-A qfe0 1
SWITCH-B 1
#702
CA-B Ethernet 1
SWITCH-A 2
#703
CA-B qfe0 1
SWITCH-B 2
#704
EMS-A Ethernet 1
SWITCH-A 3
#705
EMS-A qfe0 1
SWITCH-B 3
#706
EMS-B Ethernet 1
SWITCH-A 4
#707
EMS-B qfe0 1
SWITCH-B 4
#708
SWITCH-A 10
(see footnote 2)Uplink to router for external communications2 (Network 1)
SWITCH-B 10
(see footnote 2)Uplink to router for external communications2 (Network 2)
CA-A LOM SERIAL
Terminal server serial port # ____ (if used) 3
EMS-A LOM SERIAL
Terminal server serial port # ____ (if used) 3
SWITCH-A CONSOLE
Terminal server serial port # ____ (if used) 3
SWITCH-B CONSOLE
Terminal server serial port # ____ (if used) 3
CA-B LOM SERIAL
Terminal server serial port # ____ (if used) 3
EMS-B LOM SERIAL
Terminal server serial port # ____ (if used) 3
CA-A B SERIAL
if used
CA-B B SERIAL
if used
EMS-A B SERIAL
if used
EMS-B B SERIAL
if used
1 In this table, "Ethernet" refers to the built-in Ethernet port labeled <--->10/100 on the rear panel of the Netra 20 machine. "qfe0" is the top qfe port in the PCI slot.
2 The ports shown are applicable to 100 Mb Ethernet uplinks. Cable No. for uplink connections are customer-defined. See the procedure for more information. If you need to connect gigabit Ethernet instead of 100Mb Ethernet, contact Cisco TAC for assistance.
3 If you are using a Continuous Computing Intelligent Alarm Panel, use Table 2 instead of these six rows. See the procedure for details.
Table 2 lists the ports and cables used for serial cables that connect from the Continuous Computing Intelligent Alarm Panel to the Netra 20 LOM SERIAL ports and the 2924M Ethernet Switch CONSOLE ports. Make a copy of this table for your records. It is recommended that you sign or check each box in the Verified column as you connect the cables. Store this completed table in the documentation package for this unit.
Note
If your terminal server or alarm panel is not from Continuous Computing Intelligent Alarm Panel, do not use Table 2. Go back to Table 1.
Note
The four LOM serial cables are specially designed for the connecting the LOM ports on the Netra 20 to the SER ports on the Alarm Panel. Be sure to use the correct cables and connect them as labeled (LOM end and SER end must be connected as labeled).
Note
The two CONSOLE serial cables are specially designed for the connecting the CONSOLE ports on the Cisco 2924M Ethernet Switches to the SER ports on the Alarm Panel. Be sure to use the correct cables and connect them as labeled (SWITCH end and SER end must be connected as labeled).
Note that in some earlier installations, these cables were labeled "SWITCH" and "net CCN", where net CCN is treated the same as SER.
Appendix C: Translated Safety Warnings
Statement 1071—Warning Definition
Statement 1024—Ground Conductor
Obtaining Documentation
Cisco provides several ways to obtain documentation, technical assistance, and other technical resources. These sections explain how to obtain technical information from Cisco Systems.
Cisco.com
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You can access the Cisco website at this URL:
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Documentation CD-ROM
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You can order Cisco documentation in these ways:
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•
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We categorize Cisco TAC inquiries according to urgency:
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Priority level 4 (P4)—You need information or assistance concerning Cisco product capabilities, product installation, or basic product configuration.
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Priority level 3 (P3)—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.
•
Priority level 2 (P2)—Your production network is severely degraded, affecting significant aspects of business operations. No workaround is available.
•
Priority level 1 (P1)—Your production network is down, and a critical impact to business operations will occur if service is not restored quickly. No workaround is available.
Cisco TAC Website
You can use the Cisco TAC website to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC website, go to this URL:
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If you are a Cisco.com registered user, and you cannot resolve your technical issues by using the Cisco TAC website, you can open a case online at this URL:
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If you have Internet access, we recommend that you open P3 and P4 cases through the Cisco TAC website so that you can describe the situation in your own words and attach any necessary files.
Cisco TAC Escalation Center
The Cisco TAC Escalation Center addresses priority level 1 or priority level 2 issues. These classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer automatically opens a case.
To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to this URL:
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Obtaining Additional Publications and Information
Information about Cisco products, technologies, and network solutions is available from various online and printed sources.
•
The Cisco Product Catalog describes the networking products offered by Cisco Systems as well as ordering and customer support services. Access the Cisco Product Catalog at this URL:
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•
Cisco Press publishes a wide range of networking publications. Cisco suggests these titles for new and experienced users: Internetworking Terms and Acronyms Dictionary, Internetworking Technology Handbook, Internetworking Troubleshooting Guide, and the Internetworking Design Guide. For current Cisco Press titles and other information, go to Cisco Press online at this URL:
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Packet magazine is the Cisco monthly periodical that provides industry professionals with the latest information about the field of networking. You can access Packet magazine at this URL:
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iQ Magazine is the Cisco monthly periodical that provides business leaders and decision makers with the latest information about the networking industry. You can access iQ Magazine at this URL:
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Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering professionals involved in the design, development, and operation of public and private internets and intranets. You can access the Internet Protocol Journal at this URL:
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Training—Cisco offers world-class networking training, with current offerings in network training listed at this URL:
http://www.cisco.com/en/US/learning/le31/learning_recommended_training_list.html
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The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB's public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.
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Cisco BTS 10200 Softswitch Cabling and IRDP Procedures for Small Hardware Platform Netra 20 Option
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