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Preparing to Install the Cisco 2524 and Cisco 2525 Routers

Preparing to Install the Cisco 2524 and Cisco 2525 Routers

This chapter describes the tasks you must perform before you begin to install the Cisco 2524 and Cisco 2525 routers, and includes the following sections:

Safety Recommendations

Follow these guidelines to ensure general safety:

Warning Ultimate disposal of this product should be handled according to all national laws and regulations. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")

Maintaining Safety with Electricity

Follow these guidelines when working on equipment powered by electricity.

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 can weld the metal object to the terminals. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")
Warning  When installing the unit, the ground connection must always be made first and disconnected last. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")
Warning Read the installation instructions before you connect the system to its power source. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. ESD damage occurs when electronic components are improperly handled and can result in complete or intermittent failures.

Always follow ESD-prevention procedures when removing and replacing components. Ensure that the chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. Connect the grounding clip to an unpainted surface of the chassis frame to safely ground unwanted ESD voltages. To properly guard against ESD damage and shocks, the wrist strap and cord must operate effectively. If no wrist strap is available, ground yourself by touching the metal part of the chassis.

Caution For safety, periodically check the resistance value of the antistatic strap, which should be between 1 and 10 megohms (Mohms).

General Site Requirements

This section describes the requirements your site must meet for safe installation and operation of your system. Ensure that your site is properly prepared before beginning installation.

Site Environment

The routers can be placed on a desktop or mounted in a rack or on a wall. The location of the routers and the layout of your equipment rack or wiring room are extremely important for proper system operation. Equipment placed too close together, inadequate ventilation, and inaccessible panels can cause system malfunctions and shutdowns, and can make router maintenance difficult.

When planning your site layout and equipment locations, keep in mind the precautions described in the next section, "Preventive Site Configuration," to help avoid equipment failures and reduce the possibility of environmentally caused shutdowns. If you are currently experiencing shutdowns or unusually high errors with your existing equipment, these precautions may help you isolate the cause of failures and prevent future problems.

Preventive Site Configuration

The following precautions will help you plan an acceptable operating environment for your router and will help you avoid environmentally caused equipment failures:

Configuring Equipment Racks

The following tips will help you plan an acceptable equipment rack configuration:

Power Supply Considerations

Check the power at your site to ensure that you are receiving "clean" power (free of spikes and noise). Install a power conditioner if necessary.

Warning The device is designed to work with TN power systems. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")

The router's AC power supply includes the following features:

Warning This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 120 VAC, 15A U.S. (240 VAC, 10A international) is used on the phase conductors (all current-carrying conductors). (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")

The Cisco 2524 offers a direct current (DC) power supply. See the section "DC Power Specifications" in the chapter "Installing the Cisco 2524 and Cisco 2525 Routers" for more information.

Installation Checklist

The Installation Checklist lists the procedures for initial hardware installation of a new router. Make a copy of this checklist and mark the entries as you complete each procedure. Include a copy of the checklist for each system in your Site Log. (See the next section, "Creating a Site Log.")

Installation checklist for site______________________________________________

Router name__________________________________________________________

Task Verified by Date
Installation checklist copied
Background information placed in Site Log
Site power voltages verified
Required tools available
Additional equipment available
Router received
Optional UniverCD or printed documentation received
Chassis components verified
Initial electrical connections established
ASCII terminal or PC attached to console port
Signal distance limits verified
Startup sequence steps completed
Initial system operation verified
Software image verified

Creating a Site Log

The Site Log provides a record of all actions relevant to the router. Keep it near the chassis where anyone who installs or maintains the router has access to it. Use the Installation Checklist (see the previous section, "Installation Checklist") to verify steps in the installation and maintenance of your router. Site Log entries might include the following:

Preparing to Connect to a Network

When setting up your router, consider distance limitations and potential electromagnetic interference (EMI) as defined by the EIA.

Warning The Ethernet 10BaseT, Token Ring, serial, console, and auxiliary ports contain safety extra-low voltage (SELV) circuits. BRI circuits are treated like telephone-network voltage (TNV) circuits. Avoid connecting SELV circuits to TNV circuits. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")

2-Wire Switched 56-kbps DSU/CSU WAN Module

The 2-wire switched 56-kbps DSU/CSU WAN module includes an RJ-11 port for connection to a WAN. Cables are not included with the modules; however, port pinouts are listed in the section "Fractional T1/T1 DSU/CSU Module Port Pinouts" in the appendix "Cabling Specifications for the Cisco 2524 and Cisco 2525 Routers."

Warning Network hazardous voltages are present in the BRI, fractional T1/T1, and switched 56 cables. If you detach the cable, detach the end away from the router first to avoid possible electric shock. Network hazardous voltages are also present in the area of the BRI (RJ-45), fractional T1/T1 (RJ-48C), and switched 56 (RJ-11 or RJ-48S) ports, regardless of whether power is OFF or ON. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")
Warning  This card is intended to be installed in UL- and CSA-certified equipment in the field by the user in the manufacturer's defined operator access area. Check the equipment manufacturer to verify/confirm that your equipment is suitable for user-installed application cards. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")

Table 2-2 lists network specifications to consider before connecting the module to a network.


Table  2-1: 2-Wire Switched 56-kbps DSU/CSU WAN Module Network Specifications
Description Specification
Loop rates 56 kbps
Data rates 56 kbps
Line requirements Northern Telecom Datapath Technology, Bellcore TR-EOP-000277
Receiver sensitivity -42 dB at 80 kHz1

1 kHz = kilohertz.

4-Wire 56/64-kbps DSU/CSU WAN Module

The 4-wire 56/64-kbps DSU/CSU WAN module includes an RJ-48S port for connection to a WAN. Cables are not included with the module; however, port pinouts are listed in the section "4-Wire 56/64-kbps DSU/CSU Module Port Pinouts" in the appendix "Cabling Specifications for the Cisco 2524 and Cisco 2525 Routers.

Warning Network hazardous voltages are present in the BRI, fractional T1/T1, and switched 56 cables. If you detach the cable, detach the end away from the router first to avoid possible electric shock. Network hazardous voltages are also present in the area of the BRI (RJ-45), fractional T1/T1 (RJ-48C), and switched 56 (RJ-11 or RJ-48S) ports, regardless of whether power is OFF or ON. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")
Warning  This card is intended to be installed in UL- and CSA-certified equipment in the field by the user in the manufacturer's defined operator access area. Check the equipment manufacturer to verify/confirm that your equipment is suitable for user-installed application cards. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")

Table 2-2 lists network specifications to consider before connecting the module to a network.


Table  2-2: 4-Wire 56/64-kbps DSU/CSU Module Network Specifications
Description Specification
Loop rates DDS1: 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 kbps
Switched 56: 56 kbps
Data rates 2.4, 4.8, 9.6, 19.2, 56, and 64 kbps
Line requirements DDS: AT&T Publication 62310
Switched 56: AT&T Publication 41458, Sprint TS-0046
Receiver sensitivity -45 dB at all loop rates

1 DDS = digital data system (leased or dedicated lines).

Fractional T1/T1 DSU/CSU WAN Module

The fractional T1/T1 DSU/CSU WAN module includes an RJ-48C port. Cables are not included with the module; however, port pinouts are listed in the section "Fractional T1/T1 DSU/CSU Module Port Pinouts" in the appendix "Cabling Specifications for the Cisco 2524 and Cisco 2525 Routers."

Warning Network hazardous voltages are present in the BRI, fractional T1/T1, and switched 56 cables. If you detach the cable, detach the end away from the router first to avoid possible electric shock. Network hazardous voltages are also present in the area of the BRI (RJ-45), fractional T1/T1 (RJ-48C), and switched 56 (RJ-11 or RJ-48S) ports, regardless of whether power is OFF or ON. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")

Table 2-3 lists network specifications to consider before connecting the fractional T1/T1 DSU/CSU WAN module to a network.


Table  2-3: Fractional T1/T1 DSU/CSU WAN Module Network Specifications
Description Specification
Line rate 1.544 Mbps1
Data rates n x 56 or n x 64 kbps, where n = 1 to 242
Standards AT&T Publication 62411, 54016, and 43801

1 Mbps = megabits per second.
2 The T1 interface is not channelized.

ISDN Connections

Use an appropriate cable (not included) to connect the router directly to an ISDN. (See Table 2-4.) Refer to the section "ISDN BRI Port and Cable Pinouts" in the appendix "Cabling Specifications for the Cisco 2524 and Cisco 2525 Routers" for port and cable pinouts.

Note the following warnings:

Warning Network hazardous voltages are present in the BRI, fractional T1/T1, and switched 56 cables. If you detach the cable, detach the end away from the router first to avoid possible electric shock. Network hazardous voltages are also present in the area of the BRI (RJ-45), fractional T1/T1 (RJ-48C), and switched 56 (RJ-11 or RJ-48S) ports, regardless of whether power is OFF or ON. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")
Warning The ISDN connection is regarded as a source of voltage that should be inaccessible to user contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided equipment or connection hardware. Any hardwired connection (other than by nonremovable, connect-one-time-only lug) must be made only by PTO staff or suitably trained engineers. (To see translated versions of this warning, refer to the appendix "Translated Safety Warnings.")

Table 2-4 lists the specifications for ISDN BRI cables.


Table  2-4: ISDN BRI Cable Specifications
Specification High-Capacitance Cable Low-Capacitance Cable
Resistance (at 96 kHz) 160 ohms/km 160 ohms/km
Capacitance (at 1 kHz) 120 nF1/km 30 nF/km
Impedance (96 kHz) 75 ohms 150 ohms
Wire diameter 0.024" (0.6 mm) 0.024" (0.6 mm)
Distance limitation 32.8' (10 m) 32.8' (10 m)

1 nF = nanoFarad.

Synchronous Serial Connections

The serial port on the five-in-one synchronous serial WAN module is a 60-pin, D-type connector. The synchronous serial port (except the EIA-530) can be configured as DTE or DCE, depending on the attached cable. All DTE serial ports require external clocking from a DSU/CSU or other DCE device.

You must use a special serial cable to connect the router to a modem or DSU/CSU. This cable is available from Cisco and is usually ordered with the system. The cable uses a DB-60 connector on the chassis end. See the appendix "Cabling Specifications for the Cisco 2524 and Cisco 2525 Routers" for cable pinouts. For ordering information, contact a customer service representative.


Note Because of the small size of the pins on the DB-60 serial connector, attempting to manufacture your own serial cables is not recommended.

As with all signaling systems, EIA/TIA-232 signals can travel a limited distance at any given bit rate; generally, the slower the data rate, the greater the distance. Table 2-5 shows the standard relationship between baud rate and maximum distance.


Table  2-5: EIA/TIA-232 Speed and Distance Limitations
Data Rate (Baud) Distance (Feet) Distance (Meters)
2400 200 60
4800 100 30
9600 50 15
19200 50 15
38400 50 15
57600 25 7.6
115200 12 3.7

The use of balanced drivers allows EIA/TIA-449 signals to travel greater distances than the
EIA/TIA-232 standard. Table 2-6 lists the standard relationship between baud rate and maximum distance for EIA/TIA-449 signals. These limits are also valid for V.35 and X.21.


Table  2-6: EIA/TIA-449 Speed and Distance Limitations
Data Rate (Baud) Distance (Feet) Distance (Meters)
2400 4,100 1,250
4800 2,050 625
9600 1,025 312
19200 513 156
38400 256 78
56000 102 31
T1 50 15
Caution  The EIA/TIA-449 and V.35 interfaces support data rates up to 2.048 Mbps. Exceeding this maximum could result in loss of data and is not recommended.

Ethernet Connections

On the Cisco 2524 router, there are two Ethernet ports, an AUI port and a 10BaseT port, on the rear panel of the router. To connect your router to an Ethernet network, you can use either the Ethernet AUI or 10BaseT port, but not both. The router automatically detects which port is in use. (If you attempt to use both ports, only the 10BaseT port will work.)

Use the following equipment to connect to the Ethernet AUI port:

The connection to the AUI port can be attached using either a slide-latch or jackscrew connector.

The distance limitations for the IEEE 802.3 (10Base5 coaxial cable) specification indicate a maximum segment distance of 1,640 feet (500 m) at a transmission rate of 10 Mbps.

The distance limitations for Ethernet 10BaseT indicate a maximum segment distance of 328 feet (100 m); Ethernet 10Base2 has a maximum segment distance of 607 feet (185 m).

Token Ring Connections

On the Cisco 2525 router, there are two Token Ring ports, a STP port and a UTP port, on the rear panel of the router.

The distance limitations for the IEEE 802.5 specification indicate a maximum segment distance of 328 feet (100 m) at a transmission rate of 4 or 16 Mbps for UTP cabling. The distance limitation is 1,640 feet (500 m) for STP cabling.

Console and Auxiliary Port Considerations

Both routers include an asynchronous serial console and auxiliary port. The console and auxiliary ports provide access to the router either locally (with a console terminal) or remotely (with a modem). This section discusses important cabling information to consider before connecting a console terminal (an ASCII terminal or PC running terminal emulation software) to the console port or modem to the auxiliary port.

The main difference between the console and auxiliary ports is that the auxiliary port supports flow control and the console port does not. Flow control paces the transmission of data between a sending device and a receiving device. Flow control ensures that the receiving device can absorb the data sent to it before the sending device sends more. When the buffers on the receiving device are full, a message is sent to the sending device to suspend transmission until the data in the buffers has been processed. Because the auxiliary port supports flow control, it is ideally suited for use with the high-speed transmissions of a modem. Console terminals transmit at slower speeds than modems; therefore, the console port is ideally suited for use with console terminals.

Console Port Connections

Both routers include an EIA/TIA-232 asynchronous serial console port (RJ-45). Depending on the cable and the adapter used, this port will appear as a DTE or DCE device at the end of the cable. Your router comes with cables and adapters to connect a console terminal (an ASCII terminal or PC running terminal emulation software) to the console port. To connect an ASCII terminal to the console port, use the RJ-45 roll-over cable with the female RJ-45-to-DB-25 adapter (labeled Terminal). To connect a PC running terminal emulation software to the console port, use the RJ-45 roll-over cable with the female RJ-45-to-DB-9 adapter (labeled Terminal). The default parameters for the console port are 9600 baud, 8 data bits, no parity, and 2 stop bits. The console port does not support flow control. For detailed information about installing a console terminal, see the section "Connecting to the Console Port" in the chapter "Installing the Cisco 2524 and Cisco 2525 Routers." See the appendix "Cabling Specifications for the Cisco 2524 and Cisco 2525 Routers" for cable and port pinouts.

Auxiliary Port Connections

Both routers include an EIA/TIA-232 asynchronous serial auxiliary port (RJ-45) that supports flow control. Depending on the cable and the adapter used, this port will appear as a DTE or DCE device at the end of the cable. Your router comes with a cable and an adapter to connect a modem to the auxiliary port. To connect a modem to the auxiliary port, use the RJ-45 roll-over cable with the male RJ-45-to-DB-25 adapter (labeled Modem). For detailed information about connecting devices to the auxiliary port, see the section "Connecting the Console Terminal and Modem" in the chapter "Installing the Cisco 2524 and Cisco 2525 Routers." See the appendix "Cabling Specifications for the Cisco 2524 and Cisco 2525 Routers" for cable and port pinouts.

Inspecting the System

Do not unpack the router until you are ready to install it. If the final installation site will not be ready for some time, keep the chassis in its shipping container to prevent accidental damage. When you have determined where you want the router installed, proceed with unpacking it.

The router, cables, UniverCD or printed publications, and any optional equipment you ordered might be shipped in more than one container. When you unpack each shipping container, check the packing list to ensure that you received all of the following items:

Inspect all items for shipping damage. If anything appears to be damaged, or if you encounter problems when installing or configuring your system, contact a customer service representative.


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