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Before you install your Cisco IAD2430 series integrated access device (IAD), see the information in this chapter:
•Location and Mounting Requirements
•Distance Limitations for Interface Cables
The three mounting possibilities for your Cisco IAD are as follows:
•Rack mounting
•Wall mounting
•Desktop mounting
The mounting location must provide the following:
•Access to the chassis
•Access to a suitable power source
•Access to an appropriate earth ground
•Allowance for adequate heat dissipation and airflow around the chassis
For proper cooling, the installation location (room, closet, or cabinet) for the Cisco IAD2430 series IAD should always be well ventilated and provide adequate air circulation. The room temperature should be maintained at from 32 to 122°F (0 to 50°C).
Note The Cisco IAD2430, IAD2431, and IAD2432 series IAD chassis is designed for front-to-back airflow.
If the Cisco IAD is installed in an enclosed rack with a ventilation fan at the top, make sure that heated air drawn upward from other equipment does not prevent adequate cooling.
If you install the chassis by using slide rails, check for blocked ventilation ports when the chassis is positioned in the rack or cabinet. Make sure that the ventilation ports of the Cisco IAD are not blocked.
Tip Baffles can help isolate exhaust air from intake air. Baffles also help draw cooling air through the cabinet. The best location for the baffles depends on the airflow patterns in the rack. You can test the airflow by experimenting with various equipment arrangements.
If you install the Cisco IAD on a wall, there should be plenty of space on both sides for adequate airflow through the chassis.
If you place the unit on a desktop, do not stack other equipment or paper on the chassis. Allow plenty of space for air circulation (front to back). Inadequate ventilation can result in equipment overheating and damage.
Allow space at the back of the chassis for cable connections. Also consider the need to access the chassis for future upgrades, maintenance, and troubleshooting.
Chassis grounding is provided through the power cable, which uses a standard grounding plug. However, the chassis also requires a reliable earth ground, using the earth ground lug and hardware provided. For more information, see the "Installing the Ground Connection" section on page 3-14.
A Cisco IAD2430 series IADs with AC power supply autoselects either 100- to 127-V or 200- to 240-V operation. The Cisco IADs with AC power supply include a 6-foot (1.8-meter) electrical power cord. (A label near the power cord indicates the correct voltage, frequency, current draw, and power dissipation.)
The Cisco IAD2435 IAD connects to a 60-W, 12-VDC power adapter with the following specifications:
•Input voltage—85 to 264 VAC
•Input frequency—47 to 63 Hz
•Power output—60 W maximum
•Output voltage—+12 VDC
If you suspect that your AC power is not clean—for example, if lights flicker often or if there is machinery with large motors nearby—have a qualified person test the power. Install a power conditioner if necessary.
Please read all the warnings and cautions before applying power to your Cisco IAD.
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement 1001
Warning Read the installation instructions before you connect the system to its power source. Statement 1004
Warning This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the protective device is rated not greater than: 120 VAC, 15A U.S. (240 VAC, 10A international) Statement 1005
Warning The device is designed for connection to TN and IT power systems. Statement 1007
Warning This unit is intended for installation in restricted access areas. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means by security. Statement 1017
The cable types that you use depends on which Cisco 2430 series IAD you are using. For more information see the "Interfaces and Service Capabilities" section on page 1-11.
•Fast Ethernet cables RJ-45-to-RJ-45 straight-through cables
•Analog voice cables (RJ-21)
•T1/E1 interface cable (RJ-48)
•Synchronous serial cables
–EIA/TIA-232 (DCE/DTE)
–EIA/TIA-449 (DCE/DTE)
–V.35 (DCE/DTE)
–X.21 (DCE/DTE)
–EIA/TIA-530/EIA/TIA-530A (DCE/DTE)
Before you connect a device to the synchronous serial port (labeled SERIAL 0), you need to know the following:
•Type of device, DTE or DCE, you are connecting to the synchronous serial interface
•Type of connector, male or female, required to connect at the device
•Signaling standard required by the device
When planning your installation, consider distance limitations and potential electromagnetic interference (EMI) as defined by the Electronic Industries Association (EIA). Distance limitation information is included for the following IAD ports:
•Fast Ethernet Maximum Distance
•T1/E1-WAN Port Maximum Distances
•Serial Port Maximum Distances (WIC/VIC Cards)
•T1/E1-PBX Digital Voice Port Maximum Distances
•FXS Analog Voice Port Maximum Distance
•FXO Analog Voice Port Maximum Distance
The maximum segment distance for Fast Ethernet is 330 feet (100 meters) (specified in IEEE 802.3).
Table 2-1 shows the distance limitations for T1/E1 signals (specified in ANSI T1.403).
|
|
|
---|---|---|
T1/E1 (CSU) |
6200 |
1890 |
Table 2-2 shows the standard relationship between signal rate and maximum distance for EIA/TIA-232 signals.
|
|
|
---|---|---|
2400 |
200 |
60 |
4800 |
100 |
30 |
9600 |
50 |
15 |
19200 |
25 |
7.6 |
38400 |
12 |
3.4 |
56000 |
8.6 |
2.6 |
Table 2-3 shows the standard relationship between signal rate and maximum distance for EIA/TIA-449, V.35, and X.21 signals.
Table 2-4 shows the standard relationship between signal rate and maximum distance for EIA/TIA-530 and EIA/TIA-530A signals.
Table 2-5 shows the maximum distances between the digital voice port of a Cisco IAD and a digital PBX.
|
|
|
---|---|---|
T1/E1 (CSU) |
3000 |
915 |
The maximum distance for a Foreign Exchange System (FXS) is established by a total allowable loop resistance, including off-hook phone or terminal equipment, of 600 ohm. The maximum distance is 100 meters away from the system as a limitation of Ethernet.
The maximum distance is determined by the distance between the PBX or other equipment that provides battery and the connection to the FXO voice port.
When you run cables for any significant distance in an electromagnetic field, interference can occur between the electromagnetic field and the signals on the cables. This has two implications for installating terminal plant cabling:
•Unshielded plant cabling can emit radio interference.
•Strong electromagnetic interference (EMI), especially that caused by lightning or radio transmitters, can destroy the EIA/TIA-232 drivers and receivers in the Cisco IAD.
If you use twisted-pair cables with a good distribution of grounding conductors in your plant cabling, emitted radio interference is unlikely.
If you have cables that exceed the recommended distances, or if you have cables that pass between buildings, give special consideration to the effect of lightning strikes or ground loops. If your site has these characteristics, consult experts in lightning suppression and shielding. The electromagnetic pulse caused by lightning or other high-energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic devices.
Without pulse meters and other special equipment, most data centers cannot resolve the infrequent but potentially catastrophic problems just described. Take precautions to avoid these problems by providing a properly grounded and shielded environment and by installing electrical surge suppression.
If you remove any module, you must either install a module in its place or install a cover plate over the opening. All module openings must be either occupied or covered to prevent electromagnetic interference.
For advice on the prevention of electromagnetic interference, consult experts in radio frequency interference (RFI).