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This chapter recommends general safety guidelines to follow; lists pertinent Federal Communications Commission (FCC), Underwriter Laboratory (UL), and other agency approvals for the Cisco uBR924 cable access router; and identifies requirements to meet before going to a subscriber site to install a Cisco uBR924 cable access router.
Warning: Only trained and qualified personnel should be allowed to install or replace this equipment.
The chapter includes the following sections:
Follow these guidelines to ensure general safety:
Follow these guidelines when working with electrical equipment:
In addition, follow these guidelines when working with equipment that is disconnected from a power source, but still connected to cable wiring.
Electrostatic discharge (ESD) damage, which occurs when electronic cards or components are improperly handled, can result in complete or intermittent system failures. The
Cisco uBR924 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 (if one is available) whenever handling the Cisco uBR924 cable access router.
Following are guidelines for preventing ESD damage:
| Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be between 1 and 10 megohm (mohm). |
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area may cause harmful interference if not installed properly; in which case, the user will be required to correct the interference at the user's own expense.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
The FCC has established rules which permit the device to be directly connected to the telephone network. Standardized jacks are used for these connections. This equipment should not be used on party lines or coin phones.
If this device is malfunctioning, it may also be causing harm to the telephone network; this device should be disconnected until the source of the problem can be determined and until repair has been made. If this is not done, the telephone company may temporarily disconnect service.
The telephone company may make changes in its technical operations and procedures; if such changes affect the compatibility or use of this device, the telephone company is required to give adequate notice of the changes. You will be advised of your rights to file a complaint with the FCC.
If the telephone company requests information on what equipment is connected to their lines, inform them of:
Items b) and d) are indicated on the label. The Ringer Equivalence Number (REN) is used to determine how many devices can be connected to your telephone line. In most areas, the sum of the RENs of all devices on any one line should not exceed five (5.0). If too many devices are attached, they may not ring properly.
The countries the Cisco uBR924 is approved to operate in as of the date of this publication include:
This product is UL-listed, CSA-approved, and TUV-certified for the uses described in this guide.
NOTICE: This product is Canadian Industry certified. The Industry Canada Certification Number is 2461 9904 A. This certification means that the equipment meets certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment will operate to the user's satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment must also be installed using an acceptable method of connection. In some cases, the company's inside wiring associated with a single line individual service may be extended by means of a certified connector assembly (telephone extension cord). The customer should be aware that compliance with the above conditions may not prevent degradation of service in some situations.
Repairs to the certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas.
| Caution Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate |
The Ringer Equivalence Number (REN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total REN of all the devices does not exceed 5.
Assemble the tools and equipment needed to install Cisco uBR924 cable access routers at subscriber sites. Table 2-1 lists the recommended items that Cisco does not provide.
| Checked Off | Item |
|---|---|
| Installation toolkit including a flathead screwdriver (small to medium size); Phillips screwdriver (small to medium size); 7/16-inch open-end wrench; ESD-preventive wrist strap |
| 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 |
| Telephone tester (handset) to check the backup POTS telephone line (optional) |
| 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. |
| 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. |
| Applicable cables based on the subscriber site configuration:
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The Cisco uBR924 cable access router is available in differing bulk box and single packages:
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The service provider in-box documentation set includes:
Two additional hardware-related documents are available via CCO: Cisco uBR924 Cable Access Router Installation and Configuration Guide---this document, and the Quick Start Guide, Cisco uBR924 Cable Access Router Installation and Startup publication. Additionally, release notes are available for all Cisco IOS Release images.
The subscriber in-box documentation set includes:
Based on the number of subscriber sites you are scheduled to install, ensure that you have sufficient Cisco-provided bulk box packages. After you have completed installation, give each subscriber a copy of the Quick Start, Cisco uBR924 Cable Access Router Subscriber Setup publication, and the Regulatory Compliance and Safety Information for the Cisco uBR924 Cable Access Router publication, along with any documentation your company provides.
The RJ-45 receptacle supports standard straight-through and crossover Category 5 UTP (RJ-45) cables. Cisco does not supply Category 5 UTP cables; these cables are available commercially.
Figure 2-1 shows the RJ-45 receptacle and plug. Table 2-2 lists the pinouts and signals for the RJ-45 receptacle.
| Warning To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some LAN and WAN ports both use RJ-45 connectors. Use caution when connecting cables. |
| Pin | Description |
|---|---|
1 | Receive Data + (RxD+) |
2 | RxD- |
3 | Transmit Data + (TxD+) |
6 | TxD- |
To identify the RJ-45 cable type, hold the two ends of the cable next to each other so you can see the colored wires inside the ends, as shown in Figure 2-2.
Examine the sequence of colored wires to determine the type of RJ-45 cable:
This section contains pinout and connection information for the three voice ports on the Cisco uBR924 cable access router. The Port 1 [+2] and Port 2 voice connectors are part of a dual-connector package. These are symmetrical 6-pin connectors.
Table 2-3 lists the signals used on the respective voice port.
| Connector | Pin | Signal | Description |
|---|---|---|---|
Voice Port 1 [+2] | 1 | NC | Not connected |
| 2 | RING [+2] | RING connection for second pair of 4-wire voice port 1[+2]. This is connected in parallel with voice port 2 RING. |
| 3 | RING | RING connection for first pair of 4-wire voice port 1[+2]. This is the voice port RING connection. |
| 4 | TIP | TIP connection for first pair of 4-wire voice port 1[+2] This is the voice port TIP connection. |
| 5 | TIP [+2] | TIP connection for second pair of 4-wire voice port 1[+2]. This is connected in parallel with voice port 2 TIP. |
| 6 | NC | Not connected |
Voice Port 2 | 7 | NC | Not connected |
| 8 | NC | Not connected |
| 9 | RING | RING connection for port 2. Pin 9 on the dual connector maps to pin 3 on a standard 6-pin RJ-11. |
| 10 | TIP | TIP connection for port 2. Pin 9 on the dual connector maps to pin 3 on a standard 6-pin RJ-11. |
| 11 | NC | Not connected |
| 12 | NC | Not connected |
| 13, 14 | GND | Ground pins are connected to board ground |
Line | | | |
| 2 | NC | Not connected |
| 3 | RING | Standard 2-wire RING connection for RJ-11 connector |
| 4 | TIP | Standard 2-wire TIP connection for RJ-11 connector |
| 5 | NC | Not connected |
| 6 | NC | Not connected |
Before going to a subscriber site to install the Cisco uBR924 cable access router, do the following:
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.
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:
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.
Check the cables for general quality level, tears or cuts in the insulation, insulation that is at least 80% 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.
When preparing a site for network connections to the Cisco uBR924 cable access router, consider the following:
Potential distance limitation problems in the CATV network can be reduced by ensuring the following factors:
Table 2-4 lists the operating and nonoperating environmental site requirements. The following ranges are those within which the Cisco uBR924 cable access router will continue to operate; however, a measurement that is approaching the minimum or maximum of a range indicates a potential problem. You can maintain normal operation by anticipating and correcting environmental anomalies before they approach a maximum operating range.
|
| Specification | Minimum | Maximum |
|---|---|---|
Temperature, ambient operating | 32° F (0° C) | 114° F (40° C) |
Temperature, ambient nonoperating and storage | -13° F (-25° C) | 95° F (70° C) |
Humidity, ambient (noncondensing) operating | 5% | 95% |
Humidity, ambient (noncondensing) nonoperating and storage | 5% | 95% |
Altitude, operating and nonoperating | Sea level | 10,000 ft (3,050 m) |
Vibration, operating | 10 to 200 Hz, 0.0005 g (1 oct./min.) | - |
Vibration, nonoperating | 10 to 100 Hz, 0.0065 g (1 oct./min.) | - |
Posted: Wed Aug 25 18:10:26 PDT 1999
Copyright 1989-1999©Cisco Systems Inc.
