Cisco IAD2430 Series Integrated Access Device Hardware Installation Guide
Chapter 2: Planning Your Installation
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Planning Your Installation

Table Of Contents

Planning Your Installation

Location and Mounting Requirements

Temperature Control and Ventilation

Rack-Mounted Installation

Wall-Mounted Installation

Desktop Installation

Access to Chassis

Chassis Grounding

Power Source

Cable Types

Distance Limitations for Interface Cables

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

Interference Considerations


Planning Your Installation


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

Interference Considerations

Location and Mounting Requirements

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

Temperature Control and Ventilation

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.


Rack-Mounted Installation

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.


Caution Enclosed racks must have adequate ventilation. An enclosed rack should never be overcrowded and should have louvers and a fan.

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.


Wall-Mounted Installation

If you install the Cisco IAD on a wall, there should be plenty of space on both sides for adequate airflow through the chassis.

Desktop Installation

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.

Access to Chassis

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

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.

Power Source

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


Caution The Cisco IAD2430 series chassis provides inputs for both AC and DC power. Design your installation to use only one type of power. Do not use AC and DC power at the same time. If you do, the unit stops operating, and you need to reboot it with only a single power source.

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


Cable Types

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

Distance Limitations for Interface Cables

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

Fast Ethernet Maximum Distance

The maximum segment distance for Fast Ethernet is 330 feet (100 meters) (specified in IEEE 802.3).

T1/E1-WAN Port Maximum Distances

Table 2-1 shows the distance limitations for T1/E1 signals (specified in ANSI T1.403).

Table 2-1 T1/E1- WAN Port Distance Limitations

Signal Rate
Distance (Feet)
Distance (Meters)

T1/E1 (CSU)

6200

1890


Serial Port Maximum Distances (WIC/VIC Cards)

Table 2-2 shows the standard relationship between signal rate and maximum distance for EIA/TIA-232 signals.

Table 2-2 EIA/TIA-232 Speed and Distance Limitations 

Signal Rate
Distance (Feet)
Distance (Meters)

2400

200

60

4800

100

30

9600

50

15

19200

25

7.6

38400

12

3.4

56000

8.6

2.6



Caution EIA/TIA-232 is often used at greater distances than specified in Table 2-2. If you understand the electrical problems that can arise and can compensate for them, you might still obtain good results; however, we recommend that you keep your cable runs within the standard-defined distances.

Table 2-3 shows the standard relationship between signal rate and maximum distance for EIA/TIA-449, V.35, and X.21 signals.

Table 2-3 EIA/TIA-449, V.35, and X.21 Speed and Distance Limitations

Signal Rate
Distance (Feet)
Distance (Meters)

2400

4100

1250

4800

2050

625

9600

1025

312

19200

513

156

38400

256

78

56000

102

31

T1/E1 (1544000)

50

15



Caution The EIA/TIA-449 and V.35 interfaces support data rates up to 2.048 megabits per second (Mb/s). Exceeding this maximum could result in loss of data and is not recommended.

Table 2-4 shows the standard relationship between signal rate and maximum distance for EIA/TIA-530 and EIA/TIA-530A signals.

Table 2-4 EIA/TIA-530/EIA/TIA-530A Speed and Distance Limitations

Signal Rate
Distance (Feet)
Distance (Meters)

Up to 90000

3940

1200

110000

460

140

120000

425

130

130000

395

120

1000000

330

100

T1/E1 (1544000)

230

70


T1/E1-PBX Digital Voice Port Maximum Distances

Table 2-5 shows the maximum distances between the digital voice port of a Cisco IAD and a digital PBX.

Table 2-5 Digital Voice Port Speed and Distance Limitations

Signal Rate
Distance (Feet)
Distance (Meters)

T1/E1 (CSU)

3000

915


FXS Analog Voice Port Maximum Distance

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.

FXO Analog Voice Port Maximum Distance

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.

Interference Considerations

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).