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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:
Follow these guidelines to ensure general safety:
Maintaining Safety with Electricity
Follow these guidelines when working on equipment powered by electricity.
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.
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.
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.
The following precautions will help you plan an acceptable operating environment for your router and will help you avoid environmentally caused equipment failures:
The following tips will help you plan an acceptable equipment rack configuration:
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.
The router's AC power supply includes the following features:
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.
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.")
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.
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."
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
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.
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
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."
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
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:
Table 2-4 lists the specifications for ISDN BRI cables.
Table 2-4 : ISDN BRI Cable Specifications
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.
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
The use of balanced drivers allows EIA/TIA-449 signals to travel greater distances than the
Table 2-6 : EIA/TIA-449 Speed and Distance Limitations
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).
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.
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.
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.
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.
Copyright 1988-1996 © Cisco Systems Inc.
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
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.
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).
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.
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.
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
EIA/TIA232 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.
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
