Table Of Contents
Preparing for Installation
Safety
Warnings and Cautions
Electrical
Electrostatic Discharge
Site Requirements
Prerequisites
Environmental
Power
CATV Coaxial Cabling
Interference Considerations
Coaxial Cable Quality
Distance Limitations
Required Tools and Equipment
Preparing for Installation
This chapter recommends general safety guidelines to follow and identifies requirements to meet before going to a subscriber site to install a Cisco uBR925 cable access router. The chapter also lists the major agency approvals for the router. For additional safety and regulatory information, see "Regulatory Compliance and Safety Information."
The chapter includes the following sections:
•
Safety
•Site Requirements
•Required Tools and Equipment
Note For information on the governmental regulations and restrictions on this equipment, see "Regulatory Compliance and Safety Information."
Warning This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. (To see translations of the warnings that appear in this publication, refer to the appendix "Translated Safety Warnings.")
Safety
This section describes the general, electrical, and electrostatic discharge guidelines that should be followed when installing the Cisco uBR925 cable access router.
Warnings and Cautions
Follow these guidelines to ensure general safety:
•Install the Cisco uBR925 cable access router in compliance with national and local electrical codes:
–In the United States: National Fire Protection Association (NFPA) 70, United States National Electrical Code.
–In Canada: Canadian Electrical Code, part I, CC22.1.
–In other countries: International Electro-technical Commission (IEC) 364, part 1 through part 7.
•Ensure that the shield of the coaxial cable is connected to the grounding system of the residence or building as close to the point of cable entry as practical. In the United States, the cable system must be in accordance with Article 820-40 of the National Electric Code.
•Keep the installation area clear and dust free during and after installation.
•Keep tools and all components away from walk areas.
•Do not wear loose clothing, jewelry (including rings and chains), or other items that could get caught on the cable access router. Fasten your tie or scarf and roll up your sleeves.
Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. (To see translations of the warnings that appear in this publication, refer to the appendix "Translated Safety Warnings.")
•Use only the power supply provided by Cisco to power the Cisco uBR925 cable access router.
•Use only the power cord provided by Cisco, or other grounding IEC 320 type power supply cord that is acceptable to the local electrical authorities to connect the power supply to the power outlet. The router ships with a three-wire electrical grounding-type plug that fits only into a grounding-type power outlet. This is a safety feature. Equipment grounding should be in accordance with local and national electrical codes.
Warning Failure to properly ground the router, either by circumventing the three-wire grounding-type plug or by using a power outlet that is improperly grounded, can create a potentially hazardous electrical situation. (To see translations of the warnings that appear in this publication, refer to the appendix "Translated Safety Warnings.")
•Operate the Cisco uBR925 cable access router in accordance with its marked electrical ratings and product usage instructions.
•Always unplug the power cable before installing or removing a cable access router.
•Do not work on the system or connect or disconnect cables during periods of lightning activity.
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. (To see translations of the warnings that appear in this publication, refer to the appendix "Translated Safety Warnings.")
Electrical
Follow these guidelines when working with electrical equipment:
•Disconnect all power and external cables before installing or removing a cable access router.
Warning Unplug the power cord before you work on a system that does not have an on/off switch. (To see translations of the warnings that appear in this publication, refer to the appendix "Translated Safety Warnings.")
•Do not work alone when potentially hazardous conditions exist.
•Never assume that power has been disconnected from a circuit; always check.
•Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
•Never install equipment that appears damaged.
•Carefully examine your work area for possible hazards such as moist floors, ungrounded power extension cables, and missing safety grounds.
In addition, follow these guidelines when working with equipment that is disconnected from a power source, but still connected to cable wiring.
•Never install coaxial wiring during a lightning storm.
•Never install cable jacks in wet locations unless the jack is specifically designed for wet locations.
•Never touch uninsulated cable wires or terminals unless the line has been disconnected at the network interface.
•Use caution when installing or modifying cable lines.
If an electrical accident occurs, proceed as follows:
•Use caution; do not become a victim yourself.
•Turn off power to the system.
•If possible, send another person to get medical aid. Otherwise, assess the condition of the victim and then call for help.
•Determine if the victim needs rescue breathing or external cardiac compressions; then take appropriate action.
Electrostatic Discharge
Electrostatic discharge (ESD) damage, which occurs when electronic cards or components are improperly handled, can result in complete or intermittent system failures. The Cisco uBR925 cable access router consists of a printed circuit board that is housed in a metal enclosure. Electromagnetic interference (EMI) shielding and connectors are integral components of the enclosure. Although the enclosure helps protect the boards, use an antistatic strap whenever handling the Cisco uBR925 cable access router. This minimizes the possibility that ESD damage can occur to the internal boards by touching the external connectors.
Following are guidelines for preventing ESD damage:
•If you use an ESD wrist strap or ankle strap, ensure that it makes good skin contact and that the equipment end of the ESD strap is attached to an unfinished surface of the Cisco uBR925 cable access router.
•Always place the router on an antistatic surface or in a static shielding bag. If you are returning the item to the factory, immediately place it in a static shielding bag.
Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be between 1 and 10 megohm (Mohm).
Site Requirements
This section describes the following requirements that must be met before installing the Cisco uBR925 cable access router:
•Prerequisites
•Environmental
•Power
•CATV Coaxial Cabling
Prerequisites
Before going to a subscriber site to install the Cisco uBR925 cable access router, verify that the following have been done:
•Ensure that a coaxial cable connection is run from the cable TV trunk to the subscriber building or residence.
Note Cisco recommends that a dedicated (new) CATV coaxial cable drop be run from the grounding block directly to the Cisco uBR925 cable access router. If such a drop is not available, careful qualification of existing cable is often necessary. Cable ground should be connected to the grounding system of the building or residence as close to the point of cable entry as practical. For the United States, refer to the National Electrical Code Section 820-40 guidelines for proper grounding.
•Verify that each subscriber site is characterized at the headend to support upstream transmission and meets DOCSIS upstream and downstream RF requirements. Observe procedures in the NCTA Recommended Practises for Measurements on Cable Television Systems. Also see the "CATV Coaxial Cabling" section.
•Some sites specify that high pass filters must be installed on every tap drop that does not carry upstream data, voice, or IPPV services.
Note Installing a high pass filter between the Cisco uBR925 cable access router and the headend prevents the router from connecting to the headend. In this situation, the provisioning process fails and the router's US LED never comes on.
•Ensure that all required headend routing and network interface equipment is installed, configured, and operational. Ensure that DHCP, Cisco IOS images, and configuration files have been created and pushed to appropriate servers so that each Cisco uBR925 cable access router, when initialized, can transmit a DHCP request, receive an IP address, obtain TFTP and ToD server addresses, and download a configuration file (and updated software image) in compliance with DOCSIS and the procedures in place for your network.
•Verify that all PCs at all subscriber locations meet the minimum computing requirements. If you are using USB connectivity, verify that the USB driver software has been installed; otherwise, verify that Internet connectivity is set for the Ethernet interface. See the "PC Subsystem" section for procedures to verify TCP/IP and DHCP PC settings when onsite.
Each service provider has its own recommendations and requirements for the CPE devices connected to its network. However, at the very minimum a PC should meet the requirements listed in Table 2-1.
Table 2-1 PC Minimum Requirements for the Cisco uBR925 Cable Access Router
| |
Ethernet Connectivity
|
USB Connectivity
|
|
|
Windows 95, Windows NT, Windows 98, Windows 98SE, Windows 2000, Windows Millennium
|
Windows 98, Windows 98SE, Windows 2000, Windows Millennium
|
Processor
|
33 MHz 486 processor (75 MHz Pentium or greater is recommended)
|
75 MHz 486 processor (Windows 98/98SE)
150 MHz Pentium processor (Windows Millennium),
133 MHz Pentium processor (Windows 2000)
|
Memory
|
16 MB (or greater, depending on the operating system requirements)
|
24 MB (Windows 98/98SE), 32 MB (Windows Millennium), 128 MB (Windows 2000)
|
Internet Software
|
Internet browser
|
Internet browser
|
Networking Hardware
|
Ethernet network interface card (NIC)
|
USB-capable computer
|
Networking Cable
|
Straight-through 10Base T Ethernet cable with RJ-45 connectors2
|
Host-to-device USB cable (type "A" to type "B")
|
Networking Software
|
Ethernet software driver and TCP/IP networking software (typically supplied with the Ethernet network card)
|
USB software driver and TCP/IP networking software2
|
Configuration
|
DHCP enabled ("Obtain an IP address automatically")
|
DHCP enabled ("Obtain an IP address automatically")
|
•Ensure that you bring sufficient cables to connect all devices at all subscriber locations. For simultaneous TV and computer usage at a subscriber site, obtain cable splitters and directional couplers as appropriate to install when you install the router.
•The Cisco uBR925 cable access router automatically obtains its IP address from the headend DHCP server at power-up. Typically, the PCs at the subscriber site are also configured to use DHCP to obtain their IP addresses. If this is not the case, obtain the static IP addresses for each PC from the applicable system administrator. If necessary, also obtain the appropriate gateway and DNS information.
•As applicable for testing or reconfiguration based on your network practices, obtain IP addresses pertinent to your network from your system administrator if you are statically configuring the subscriber site. (For most networks, IP addresses are supplied automatically.)
•If supporting VoIP devices, obtain the phone numbers and IP addresses that the service provider has assigned to each of the voice ports on the Cisco uBR925 cable access router.
Environmental
"Technical Specifications," lists the operating and nonoperating environmental site requirements for operation of the Cisco uBR925 cable access router. The ranges indicate the minimum and maximum values allowed for the router's operation, but a measurement that approaches the minimum or maximum of a range could indicate a potential problem. You can maintain normal operation by anticipating and correcting environmental anomalies before they approach a maximum operating range.
Caution For proper airflow, keep the back, sides, and bottom of the cable access router clear of obstructions and away from the exhaust of other equipment. To prevent the unit from overheating, never install the Cisco uBR925 cable access router in an enclosed rack or room that is not properly ventilated or air conditioned.
Power
The Cisco uBR925 cable access router does not contain a power switch. After the cable system technician installs, connects, powers on, and initializes the unit, it is intended to remain connected to the broadband network when operating normally.
Before plugging in and applying power to the Cisco uBR925 cable access router, verify that the power source is within the values given in "Technical Specifications."
Note The same power supply supports both domestic (U.S.) and international operation. Different power cords are required, however, depending on the country of operation.
Caution Use only a power supply and cord that is provided by Cisco and that is applicable to the country of operation. Using any other vendor's power supply and cord can cause loss of data or permanent damage.
CATV Coaxial Cabling
When running the coaxial line from the cable TV trunk connection to the subscriber site, consider the issues of electromagnetic interference (EMI), coaxial cable quality, and distance limitations for signaling, as described in the following sections.
Interference Considerations
When wires are run for any significant distance in an electromagnetic field, interference can occur between the field and the signals on the wires. This fact has two implications for the construction of plant wiring:
•Bad wiring practice can result in radio interference emanating from the plant wiring.
•Strong EMI, especially when it is caused by lightning or radio transmitters, can destroy the signal drivers and receivers in the Cisco uBR925 cable access router, and can even create an electrical hazard by conducting power surges through lines and into equipment. (Review the safety warnings in the "Electrical" section.)
Note Category 5 data wiring and telco wiring is much more susceptible to EMI than high-grade well-shielded CATV coaxial cable.
If wires exceed recommended distances, or if wires pass between buildings, give special consideration to the effect of a lightning strike in your vicinity. The electromagnetic pulse caused by lightning or other high-energy phenomena can easily couple enough energy into unsaddled conductors to destroy electronic devices. If you have had problems of this sort in the past, you might want to consult experts in electrical surge suppression and shielding.
Coaxial Cable Quality
CATV coaxial cable quality can vary dramatically at each installation site. Poor insulation, improperly installed additional outlets, the condition and length of the cable's center conductor, and the quality of the cable can negatively affect the connectivity and performance of the cable access router for digital data transmission. Coaxial cable tolerances for the transmission of two-way digital data are much lower than the tolerances for the transmission of downstream-only video. Coaxial cable that is used to carry two-way digital data must be of very high quality.
Note A 5 dB reduction in signal quality for analog downstream video might cause a slight degradation of picture clarity, which might not even be noticeable to a subscriber. However, even a 1 dB reduction in signal quality for digital data could completely disrupt service to a Cisco uBR925 cable access router user.
Check the cables for general quality level, tears or cuts in the insulation, insulation that is at least 80 percent braid with foil, a broken or bent center conductor at the conductor ends, the length of the center conductor, and splitters or amplifiers that have been added to extend video connectivity at the installation site.
Note The center conductor should extend 1/8 inch (3.2 mm) beyond the end of the conductor.
Tip Cisco recommends that you replace any cable that is in question and begin the installation with clean, two-way digital data transmission media. If the cable is of high-quality and was recently installed, replacing the connectors with high-quality connectors can also improve performance and eliminate future service calls.
Caution If you replace a connector, be careful not to score the center conductor. A scored conductor can reduce or impair performance for channels broadcast between 550 and 860 MHz. If the center conductor is too short, signals between 5 and 42 MHz might be affected.
Distance Limitations
The size of your networks and the distances between connections on the CATV network can affect the successful installation of a Cisco uBR925 cable access router, which must be within 100 miles of the CMTS. This distance can also be defined in relation to the speed of light through the transmission network as being less than 2 msec from the CMTS to the Cisco uBR925 cable access router and back again.
Note Exceeding this distance is a violation of the DOCSIS RFI specification.
When preparing a site for network connections to the Cisco uBR925 cable access router, consider the following:
•Number of amplifiers from the installation site to the nearest node
•Number of outlets and amplifiers at the installation site
•Cable pinouts, if you plan to build your cables
Potential distance limitation problems in the CATV network can be reduced by ensuring the following factors:
•Correct, linear unity gain two-way sweep procedure is in place
•Industry-standard configuration practices are used at the headend
•Downstream frequency is known at the time of installation
•Absolute downstream signal level can be measured where it enters the cable access router
Required Tools and Equipment
Assemble the tools and equipment needed to install the Cisco uBR925 cable access router at subscriber sites. Table 2-2 lists the recommended items that Cisco does not provide.
Table 2-2 Recommended Tools, Cabling, and Equipment List
Checked Off
|
Item
|
Normal Installation Tools
|
| |
Installation toolkit including:
•Flathead screwdriver (small to medium size)
•Phillips screwdriver (small to medium size)
•7/16-inch open-end wrench
•ESD-preventive wrist strap
|
| |
High-quality, shielded RF coaxial cable (with at least 80% braid) to connect the cable access router to the cable system.
|
| |
Coaxial cable splitter and high pass filter, as appropriate.
|
| |
Host-to-device (type "A" to type "B") USB cable, maximum length 5 meters, if using USB connectivity.
|
| |
One straight-through category 5 UTP (10Base T) Ethernet cable to connect one computer is provided with the cable access router. If connecting additional PCs or if using an Ethernet hub to connect multiple PCs to the cable access router, the following additional cabling is required:
•Crossover category 5 UTP (10Base T) Ethernet cable to connect the Ethernet hub to the cable access router
•Additional straight-through category 5 UTP (10Base T) Ethernet cables for each additional PC.
|
| |
Voice cables and appropriate items to connect the cable access router to the telephone, modem, or fax device at the site. Each telephone, modem, or fax device requires a two-wire or four-wire cable with an RJ-11 connector on at least one end. The connector on the other end is usually also an RJ-11 connector, but this depends on the telephone, modem, or fax device being connected.
|
| |
Connector assemblies/adapters and wiring items for subscriber sites that support multiple telephones or fax devices on a VoIP telephone line; items and wiring must be in accordance with regulations in the country of operation.
|
Optional Troubleshooting Tools
|
| |
Signal level meter capable of reading a 64 QAM signal or a spectrum analyzer (HP8594Q or equivalent) as appropriate. An alternative is a clear understanding of the digital-to-analog channel amplitude offset, and a calibrated analog signal level meter to measure a nearby adjacent analog carrier.
|
| |
Mixed set of attenuators (pads), cable adapters, splitters, high pass filters (HPF), directional couplers as appropriate.
|
| |
10BaseT Ethernet cable tester.
|
| |
Portable, hand-held console terminal such as a laptop computer with RS-232 serial port communications software, and a setting of 9600 baud, 8 data bits, no parity, and 1 stop bit (9600 8N1)—reserved for technicians in networks supporting remote configuration and troubleshooting.
|
| |
Cable console kit and console cable to connect to the portable, hand-held console device.
|
The Cisco uBR925 cable access router is available in the following bulk box and single packages:
•Bulk box packages include:
–5 Cisco uBR925 cable access routers
–5 power supplies with 5 power cords based on the country of operation
–1 10BaseT Ethernet straight-through cable
–1 USB driver software installation CD
–1 subscriber documentation set
•Single packages include:
–1 Cisco uBR925 cable access router
–1 power supply with power cord appropriate for the country of operation
–1 10BaseT Ethernet straight-through cable
–1 USB driver software installation CD
–1 subscriber documentation set
Caution Use only the Cisco-provided power supply and cord. Using any other vendor's power supply and cord can cause loss of data or permanent damage. Ensure the power cord is suitable for your country of operation.
The subscriber in-box documentation set includes:
•Quick Start, Cisco uBR925 Cable Access Router Subscriber Setup card
•Cisco uBR925 Cable Access Router Quick Start User Guide
The service provider in-box documentation set includes:
•Warranty card
•Licensing information
The following additional documents are available on the Cisco.com website:
•Cisco uBR925 Cable Access Router Hardware Installation Guide—this document
•Cisco uBR905/uBR925 Cable Access Router Software Configuration Guide
•Release notes are available for all Cisco IOS Release images
After you have completed installation, give each subscriber a copy of the Quick Start, Cisco uBR925 Cable Access Router Subscriber Setup publication, along with any documentation your company provides.
Warning Ultimate disposal of this product should be handled according to all national laws and regulations. (To see translations of the warnings that appear in this publication, refer to the appendix "Translated Safety Warnings.")
Feedback
