Preparing to Install the Universal Access Server

This chapter describes the tasks you must perform before you begin to install the access server and includes the following sections:

Safety Recommendations

Any device that uses electricity must be handled carefully; follow these guidelines to ensure general safety:

Keep the chassis area clear and dust-free during and after installation.
Put the removed chassis cover in a safe place.
Keep tools away from walk areas where you and others could fall over them.
Do not wear loose clothing that could get caught in the chassis. Fasten your tie or scarf and roll up your sleeves.
Wear safety glasses if you are working under any conditions that might be hazardous to your eyes.
Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.

Warning Ultimate disposal of this product should be handled according to all national laws and regulations.

Maintaining Safety with 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.

Follow these guidelines when you work on equipment powered by electricity.

Locate the emergency power-OFF switch for the room in which you are working. Then, if an electrical accident occurs, you can act quickly to turn OFF the power.
Before working on the system, unplug the power cord.
Disconnect all power before doing the following:
- Installing or removing a chassis
- Working near power supplies

Warning When installing the unit, the ground connection must always be made first and disconnected last.

Do not work alone if potentially hazardous conditions exist.
Never assume that power is disconnected from a circuit. Always check.

Warning Read the installation instructions before you connect the system to its power source.

Look carefully for possible hazards in your work area, such as moist floors, ungrounded power extension cables, frayed power cords, and missing safety grounds.
If an electrical accident occurs, proceed as follows:
- Use caution; do not become a victim yourself.
- Turn OFF power to the system.
- If possible, send another person to get medical aid. Otherwise, assess the condition of the victim and then call for help.
- Determine if the person needs rescue breathing or external cardiac compressions; then take appropriate action.

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).

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 you remove and replace 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 guard against ESD damage and shocks, the wrist strap and cord must operate properly. 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).

Preparing to Connect to a Network

When you set up your access server, consider distance limitations and potential electromagnetic interference (EMI) as defined by the Electronic Industries Association (EIA).

Warning Hazardous network voltages are present in WAN ports regardless of whether power to the router is OFF or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables, detach the end away from the router first.

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 a nonremovable, connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers.

Quad T1/PRI Card

The quad T1/PRI card includes four RJ-45 ports. Cables are not included with the cards; however, cable specifications and port pinouts are listed in the section "Quad T1 PRI Card Port Pinouts" in the appendix "Cabling Specifications for the Universal Access Server."

A 10-position rotary switch allows the user to chose which of the four ports is selected for monitoring through the two sets of bantam jacks (TXMON, TXIN, TXOUT, and RXMON, RXIN, RXOUT). See "Using the Bantam Jacks" in the appendix "Troubleshooting the Universal Access Server" for a detailed description of the signals available at each of the bantam jacks. The LED labeled MON at each port illuminates to indicate that port has been selected for monitoring. Only one port can be selected at a time. None of the ports is selected when the switch is set to the OFF position and all of the LEDs are off.

Figure 2-1: Quad T1/PRI Card

Table 2-1 lists the network specifications you should consider before connecting the quad T1/PRI card to a network.

Table 2-1: Quad T1/PRI Card Network Specifications

Description	Specification
Line rate	1.544 Mbps
Data rates	number x 56 or number x 64 kbps, where number = 1 to 24
Standards	AT&T Pub. 62411, 54016, and 43801 ANSI T1.403

Quad E1/PRI Card

The quad E1/PRI WAN card includes four RJ-45 ports for terminating 120-ohm balanced lines or 75-ohm unbalanced lines. Cables are not included with the card; however, cable specifications and port pinouts are listed in the section "Quad E1 PRI Card Cable Assemblies and Pinouts" in the appendix "Cabling Specifications for the Universal Access Server."

Figure 2-2: Quad E1/PRI Card

Setting the Port Impedance

A 10-position rotary switch (labeled IMP SEL) allows you to chose the number of ports that are terminated as 75-ohm unbalanced lines. The LED labeled 120 at each port indicates the input impedance of that port. If the LED is on, it indicates the impedance of the port is set to 120 ohms. If the LED is off, it indicates the impedance of the port is set to 75 ohms.

The input impedance of each port for various impedance selection switch settings is shown in Table 2-2 on the following page.

Table 2-2: Impedance Selection Switch Settings

Switch Position	Port 0	Port 1	Port 2	Port3
1	75 ohm	120 ohm	120 ohm	120 ohm
2	75 ohm	75 ohm	120 ohm	120 ohm
3	75 ohm	75 ohm	75 ohm	120 ohm
4	75 ohm	75 ohm	75 ohm	75 ohm
5	120 ohm	120 ohm	120 ohm	120 ohm

Setting the Receive Shield Jumpers

Jumpers on the quad E1/PRI card configure the 75-ohm unbalanced ports so the receive shield is connected to ground. You can remove these jumpers to disconnect the receive shield from ground.

Figure 2-3: Receive Shield Jumpers for 75-ohm Unbalanced Ports

MICA and Microcom Carrier Cards

The MICA and Microcom carrier cards do not include physical ports to which you connect an external device. The carrier cards connect to the network through the system backplane to a quad T1/PRI or quad E1/PRI card installed in the access server chassis. Data is transmitted or received on T1 or E1 lines connected to the quad T1/PRI or quad E1/PRI card and then routed to the modules on the carrier cards.

6- and 12-Port Modem Modules

The 6- and 12-port modem modules connect to the network through the system backplane of their respective carrier cards installed in the access server chassis. Data is transmitted or received on T1 (or E1) lines connected to the quad T1/PRI (or quad E1/PRI) card, then routed to the modem modules on the carrier cards.

Note The 12-port modem modules can also be used in the Cisco AS5200 universal access server. The modular design of the Cisco AS5300 universal access server allows you to use those cards you may have already purchased for use with the Cisco AS5200 universal access server.

Note The 6-port modem module plugs into the MICA carrier card and cannot be plugged into the Microcom carrier card. The 12-port modem module plugs into the Microcom carrier card and cannot be plugged into the MICA carrier card.

Ethernet Connections

There are two Ethernet ports on the rear panel of the access server: 10BaseT and 10/100BaseT (selectable). Both ports use unshielded twisted-pair (UTP) cable, and the 10/100BaseT port requires Category 5 cable. The maximum segment distance is 328 feet (100 meters). UTP cables look like the cables used for ordinary telephones; however, UTP cables meet certain electrical standards that telephone cables do not. Cables are not included.

Console and Auxiliary Port Considerations

The access server includes an asynchronous serial console and auxiliary port. The console and auxiliary ports provide access to the access server 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 hardware (Request To Send [RTS])/Clear To Send [CTS]) 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

The access server includes an EIA/TIA-232 asynchronous serial console port (RJ-45). Depending on the cable and the adapter used, this port will appear as a data terminal equipment (DTE) or data communications equipment (DCE) device at the end of the cable. Your access server 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 rollover 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 rollover 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 hardware flow control. For detailed information about installing a console terminal, see the section "Connecting the Console Terminal and Modem" in the chapter "Installing the Universal Access Server." See the appendix "Cabling Specifications for the Universal Access Server" for cable and port pinouts.

Auxiliary Port Connections

The access server includes 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 access server 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 rollover 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 Universal Access Server." See the appendix "Cabling Specifications for the Universal Access Server" for cable and port pinouts.

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.

The access server AC power supply includes the following features:

Autoselects either 110V or 220V operation.
All units 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 for the unit.)

Caution In a DC power supply installation, do not connect the -48 VDC return to chassis ground at the Cisco AS5300. A single-point ground is recommended at the power distribution rack.

Table of Contents

Preparing to Install the Universal Access Server