Maintenance

Note Instructions for rack-mounting the AC-input power shelf and for replacing an AC-input power supply are included in the Cisco AS5850 Universal Access Server Hardware Installation Guide document that ships with the optional AC-input power shelf.

Powering Off the Access Server

Some procedures in this section require you to power off the access server. Refer to this section when appropriate.

Powering off the access server involves removing power from the following components:

access server
AC-input power shelf, if applicable

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 weld the metal object to the terminals.

Step 1 Power OFF (O) the power switches located on each PEMF front panel. (See Figure 5-1.)

Figure 5-1: Power Switches on the PEMFs

Step 2 If you are using the optional AC-input power shelf , unplug the power cables

Replacing a DC Power Entry Module/Filter

This section explains how to remove and replace the Power Entry Module/ Filters (PEMFs) in the chassis.

Note The color coding of the DC-input power supply leads depends on the color coding of the DC power source at your site. Typically, green or green/yellow is used for ground, black is used for +48V (return), and red or white is used for -48V. Verify that the lead color coding for the DC-input power supply matches the color coding at the DC power source.

Tools and Parts Required

You need the following items to replace a PEMF:

A new PEMF (AS5850-DC-PEMF=)
6 American Wire Gauge (AWG), or 10 mm², cable rated for at least 140^o F (60^o C) (for new DC-input power supply installations)
Standard wire stripper
No. 2 Phillips screwdriver
1/4-in. flat-blade screwdriver
ESD-preventive wrist strap

Removing a PEMF

This section explains how to remove and replace the PEMFs in the chassis.

Warning Before completing any of the following steps, and to prevent short-circuit or shock hazards, ensure that power is removed from the DC-input or optional AC-input circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC-input or optional AC-input circuit, switch the circuit breaker to the OFF (O) position, and tape the switch handle of the circuit breaker in the OFF (O) position.

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

Caution If your system requires the AC-input power shelf for AC-to-DC conversion, you should schedule a time for system maintenance and replace the PEMF at that time. Refer to the Cisco AS5850 Universal Access Server Hardware Installation Guide document that ships with the optional AC-input power shelf.

Note The color coding of the DC-input power supply leads depends on the color coding of the DC power source at your site. Typically, green or green/yellow is used for ground, black is used for +48V (return), and red or white is used for -48V. Verify that the lead color coding you choose for the DC-input power supply matches lead color coding used at the DC power source.

The following procedure for hot-swapping a PEMF assumes you are not using the optional AC-input power shelf and that each PEMF in your server is connected to a separate DC power source. If you are removing and replacing a PEMF in an AC-configured system, you must perform the replacement during a scheduled maintenance time and power off the entire system.

To remove a PEMF, complete the following steps:

Step 1 Power OFF the central office circuit breaker connected to the PEMF you are removing and tape the switch in the OFF position.

Step 2 Attach an ESD-preventive wrist strap between you and an unpainted chassis surface.

Step 3 Power OFF the power switch located on the PEMF front panel. (See Figure 5-2.)

Caution Terminal blocks may be energized. Ensure that the power source circuit breaker is disconnected and the PEMF power switch is in the OFF (O) position before accessing terminals.

Figure 5-2: PEMF Front Panel

Step 4 Using a 1/4-in. flat-blade screwdriver, disconnect the DC cables from the DC-input power terminal block. (See Figure 5-2.)

Step 5 Unplug the alarm cable from the bell alarm terminal block. (See Figure 5-2.)

Step 6 Using a 1/4-in. flat-blade screwdriver, loosen the captive screws on the PEMF front panel.

Step 7 Grasp the handle and carefully pull the PEMF from the backplane and blower connectors using a gentle rocking motion; then remove the PEMF from the chassis. (See Figure 5-3.)

Figure 5-3: Removing and Replacing a PEMF

This completes the PEMF removal process. Continue with section "Replacing the Power Entry Module."

Replacing the Power Entry Module

To install a new PEMF, complete the following steps. (Refer to Figure 5-3 to locate the PEMFs in the server.)

Step 1 Grasp the PEMF handle and carefully align the PEMF with the power supply bay.

Step 2 Slide the PEMF into the power supply bay until it is fully seated and connected to the backplane and blower connectors.

Step 3 Using a 1/4-in. flat-blade screwdriver, tighten the captive screws on the PEMF front panel.

Step 4 Plug the alarm cables into the bell alarm terminal block. (See Figure 5-3.)

This completes the procedure for replacing a PEMF in the server. To connect the PEMF power cables and power on the PEMF, continue with section "Connecting to Your DC Power Source."

Note If you are connecting to an AC power source, continue with section "Connecting to an AC Power Source."

Connecting to Your DC Power Source

If your site has access to a DC power source, you need to provide your own DC power cables. In the United States you need to use 6 AWG stranded or solid copper wire; elsewhere use 16 mm² solid or 10 mm² stranded copper wire.

To reconnect the PEMF to your DC-input power source, complete the following steps:

Step 1 Locate the DC terminal block located on the server PEMF front panel and loosen the connector screws using a 1/4-in. flat-blade screwdriver. (See Figure 5-4.)

Step 2 Strip the DC power cable of its outer insulation to expose about 1/2-in. of copper wire.

Step 3 Connect the power cable stripped wires to the DC terminal block on the PEMF and securely tighten the terminal block connector screws. (See Figure 5-4)

Figure 5-4: Power Entry Module (PEMF) DC Terminal Block

Step 4 Connect the other end of your DC power cables to your DC power source.

Step 5 Repeat Step 1 through Step 4 to connect your DC power cables to the second PEMF.

Note If the two DC conductors entering the PEMF terminal block are reversed, a yellow warning LED on the PEMF lights to indicate a miswire. No damage will occur; however, you must power OFF the power at the source and reverse the connections.

Step 6 Power ON the central office circuit breaker connected to the PEMF you are replacing.

Step 7 Power ON ( | ) the power switch located on the PEMF front panel. (See Figure 5-2.)

This completes the procedure for replacing a PEMF and connecting to your DC power source. Continue with section "Verifying and Troubleshooting the Installation" for installation troubleshooting tips.

Connecting to an AC Power Source

If you are using the optional AC-input power shelf, you cannot remove and replace a PEMF while the system is powered on.

Caution If your system requires the AC-input power shelf for AC-to-DC conversion, you should schedule a time for system maintenance and replace the PEMF at that time. See the "Replacing an AC-Input Power Supply" section for installation and replacement instructions.

Verifying and Troubleshooting the Installation

To complete the installation, verify that the power supply LEDs operate properly and that you have wired the DC-input connections correctly. Each PEMF contains two LEDs on the front panel - POWER and MISWIRE. (Refer to Figure 5-2.)

Verify that the POWER LED is on.

: If neither the POWER nor the MISWIRE LED is on, check the voltage at the DC-input terminal block. If the voltage reading falls between -40 and -60 VDC, replace the PEMF.

Verify that the MISWIRE LED remains off.

: If the MISWIRE LED is on, the two DC conductors entering the PEMF DC-input terminal block are reversed. Power OFF power at the source and reverse the connections.

This completes the procedures for installing and troubleshooting a PEMF. To verify that the PEMF is properly installed, refer to the Cisco AS5850 Universal Access Server Hardware Installation Guide.

Replacing an AC-Input Power Supply

The 2400W AC-input power shelf is an optional component of the Cisco AS5800 and is used to convert AC-input power into DC-output power for the DC-powered Cisco AS5850 access server. The AC-input power shelf contains three AC-input power supplies.

This section explains how to remove and replace an individual power supply in the power shelf.

Tools and Parts Required

You need the following tools and parts to remove and replace an individual power supply:

NP1200 AC power supply (=)
ESD-preventive wrist strap
If access to the power supply bays is partially blocked by a power strip or other permanent rack fixture, you will need a 1/4-in., flat-blade screwdriver to temporarily detach the fixture from the equipment rack-mounting strips.

Removing and Replacing a Power Supply

Use the following procedure if you are replacing a faulty power supply or if you want to reduce the weight of the power shelf before you install it in a rack.

The AC-input power shelf is configured with three power supplies. You can remove or replace one of the power supplies without affecting system operation. When power is removed from one supply, the redundant power feature causes the other two power supplies to ramp up to full power and maintain uninterrupted system operation.

To remove a power supply, follow these steps:

Caution A single power supply weighs 14.5 lb (6.6 kg). Use both hands when removing or replacing a power supply.

Step 1 Attach an ESD-preventive wrist strap between you and an unpainted chassis surface.

Step 2 Using a flathead screwdriver, pry the ejector lever up to release the lock. The power supplies are secured by self-locking ejector levers.

Step 3 Apply downward pressure to the ejector lever/handle to disconnect the power supply from the power backplane.

Figure 5-5: Removing and Replacing a Power Supply

Step 4 Grasp the power supply handle and pull the power supply halfway out of the bay. Then with your other hand under the power supply to support it, pull the power supply completely out of the bay.

To replace the power supply, follow these steps:

Step 1 Slide the power supply into the power supply bay. Push the power supply fully into the power shelf until the front is flush against the power shelf frame. To prevent damage to the backplane connector, do not jam the power supply into the bay.

Step 2 Push the self-locking ejector lever upward until the plastic handle/spring-clip locks into place (listen for the click).

This completes the power supply replacement procedure.

Replacing a Server Card

The procedure for removing all trunk, port, or route switch controller cards is essentially the same, and is provided in the Cisco AS5850 Universal Access Server Card Guide.

Replacing a Flash Memory Card

The RSC contains PCMCIA slots for Flash memory cards.

This section describes inserting and removing a Flash memory card in the server.

The RSC has two PCMCIA slots for Flash memory cards. The slots are numbered left to right, slot 0 and slot 1, respectively.

Installing a Flash Memory Card

To install a Flash memory card, complete the following steps:

Step 1 Orient the Flash memory card so that the connector end faces the appropriate slot. (See Figure 5-6.)

Step 2 Carefully insert the card in the slot until it mates with the slot connector at the back of the slot and the eject button for the slot pops out toward you.

Note Flash memory cards do not insert completely flush with the RSC card front panel; a portion of the card remains outside of the slot. Do not attempt to force the card past this point.

Removing a Flash Memory Card

To remove a Flash memory card from the PCMCIA slot, complete the following steps (see Figure 5-6):

Step 1 Press the ejector button on the slot.

Step 2 Grasp the card and pull it from the slot.

Step 3 Place the card in an antistatic bag.

Figure 5-6: Inserting and Removing a PCMCIA Flash Card

This completes the server controller card and Flash memory installation procedures.

Replacing the Blower Assembly

The Cisco AS5800 is equipped with a blower assembly, which is designed to monitor system internal operating temperatures and maintain acceptable cooling parameters.

This section explains how to remove and replace the blower assembly in the server chassis.

Tools and Parts Required

You need the following tools and parts to remove and replace the blower assembly. If you need additional equipment, contact a service representative for ordering information.

New blower assembly (DS58-FAN=)
1/4-in. flat-blade screwdriver
ESD-preventive wrist strap
Antistatic mat or packaging

Removing the Blower Assembly

Caution The system shuts down cards approximately 2 min. after the system temperature threshold has been reached. Although normal blower assembly replacement is estimated not to exceed 30 sec., if you expect the replacement process to exceed 1 min., we recommend that you shut down the system prior to the removal and replacement process.

Caution The blower assembly weighs 27.5 lb (12.5 kg). Use both hands when removing or replacing the blower assembly.

To remove the blower assembly, complete the following steps:

Step 1 Attach an ESD-preventive wrist strap between you and an unpainted chassis surface.

Step 2 Loosen the two captive screws on the blower assembly front panel. (See Figure 5-7.)

Step 3 Grasp the blower assembly handle with one hand and pull the blower assembly straight toward you, about halfway out of the slot.

Step 4 Place your other hand under the blower assembly as it extends from the server chassis to support the blower and prevent it from falling.

Step 5 Slowly pull the blower assembly all the way out of the slot and place it on an antistatic mat or in packaging to return it to the factory.

Figure 5-7: Blower Assembly Removal and Replacement

This completes the blower assembly removal process. Continue with section "Replacing the Blower Assembly."

Replacing the Blower Assembly

To replace the blower assembly in the server, complete the following steps.

Caution The blower assembly weighs 27.5 lb (12.5 kg). Use both hands when removing or replacing the blower assembly.

Step 1 Attach an ESD-preventive wrist strap between you and an unpainted chassis surface.

Step 2 Place one hand on the blower assembly handle and place your other hand under the blower assembly to support the weight.

Step 3 Position the blower assembly in the opening and slide it fully into the chassis until the PEMF connectors mate. (See Figure 5-7 .)

Note All electrical connections are fully operative when the PEMF connectors mate. The blower assembly will immediately power up if the system is powered on.

Step 4 Using a 1/4-in. flat-blade screwdriver, tighten the two captive screws on the blower assembly front panel.

Step 5 Note service maintenance on your Site Log sheet.

This completes the blower assembly installation procedure. Continue with section, "Verifying and Troubleshooting the Installation" to verify your installation.

Verifying and Troubleshooting the Installation

To verify that the blower assembly is properly installed and operational, complete the following steps:

Step 1 Listen to verify that the fans are operative. In noisy environments, you may want to place your hand to the rear of the blower assembly and feel for airflow from the exhaust vent.

Step 2 Verify that the green power LED on the blower assembly front panel lights.

If the power LED remains off, verify that the blower assembly is fully installed in the server, the connector is firmly connected to the backplane, and the captive screws are adequately tightened.

Step 3 Verify that the fault LEDs on the blower assembly front panel remain green.

If a fault LED lights yellow, the newly installed blower assembly may be faulty, or the PEMF connector may be damaged. Shut OFF system power; remove the blower assembly from the server, and check the connectors. If the connectors are in good condition, reinstall the blower assembly in the server and power ON the system.
If the fault LED is still on, assume that the fan bank in the blower assembly is faulty. Install another blower assembly and return the faulty blower assembly to the factory.

Replacing the Backplane Module

The Cisco AS5850 includes a passive backplane in the server that can be ordered as a spare. This section explains how to remove and replace the backplane in the server chassis.

This section explains how to remove and replace the backplane in the server chassis. In most cases, the chassis will be fully installed to include cards in the card cage. As part of the backplane removal, you must unseat all cards from the server backplane.

Warning Before completing any of the following steps, and to prevent short-circuit or shock hazards, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF (O) position, and tape the switch handle of the circuit breaker in the OFF (O) position.

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

Before you perform the tasks in this section you must first perform the following actions:

Step 1 Power off the server. Refer to the "Powering Off the Access Server" section.

Step 2 Disconnect power and alarm cables to the PEMFs, and remove the PEMFs. Refer to the "Removing a PEMF" section.

Note You need access to both the front and rear of the Cisco AS5850 universal access server. Some of the procedures are performed from the front and some are performed from the rear.

Tools and Parts Required

The following parts and tools are required to remove and replace the backplane module. If you need additional equipment, contact a service representative for ordering information.

New backplane module (MAS-5814BP=)
1/4-in. flat-blade screwdriver
No. 2 Phillips screwdriver
ESD-preventive wrist strap
Site Log sheet to record service maintenance
Cable ties (optional)
ESD shielding bag

Removing the Backplane

This procedure is ideally performed during a scheduled maintenance time.

After youremove the PEMFs, you must disconnect the RSCs and other cards from the backplane connectors. You do not need to remove the cards completely from the server chassis; however, you must disconnect incoming CE1/CT3 trunk line cables.

To disconnect the feature cards and server controller cards from the backplane, follow these steps:

Step 1 Attach an ESD-preventive wrist strap between you and an unpainted chassis surface.

Step 2 Disconnect incoming CE1/CT3 trunk line cables and secure them out of the way using cable ties, if necessary. On the RSC, disconnect the server interconnect cable and the 10BaseT connection, if applicable.

Warning Before opening the chassis, disconnect the telephone network cables to avoid contact with telephone-network voltages.

Step 3 Using a number 2 Phillips screwdriver, loosen the panel fasteners at the top and bottom of the card front panel.

Step 4 Pull either the upper or lower ejector lever away from the card front panel to disengage the card from the backplane connector. (See Figure 5-8.)

Figure 5-8: Ejector Lever Enlarged

Step 5 Grasp the ejector levers and pull the card partially out of the server slot. (See Figure 5-9.)

Figure 5-9: Unseating Cards

There are no longer any connections to the backplane. To remove the backplane:

Step 1 Locate the horizontal bar that spans the width of the server chassis rear and remove the four screws (two on each side of the server outer chassis) using a No. 2 Phillips screwdriver. Save the screws.

Step 2 Using a No. 2 Phillips screwdriver, remove the 26 M3 x 8-mm screws around the backplane perimeter . (See Figure 5-10.) Save the screws.

Figure 5-10: Backplane Module—Rear View

Step 3 Remove the backplane and place it in an ESD shielding bag. Use the replacement backplane carton to return the faulty backplane to the factory, if necessary.

This completes the server backplane removal process.

Replacing the Backplane

To replace the backplane complete the following steps and reverse the procedures used to remove cables and components. When you are finished, use a Site Log sheet to record service maintenance.

Step 1 Unpack the new backplane module (MAS-5814BP=) from the ESD shielding bag and install the backplane in the same position as the one you just removed.

Step 2 Reuse the screws used to secure the old backplane and tighten the screws using a No. 2 Phillips screwdriver. (See Figure 5-10.)

Step 3 Replace the server PEMFs and tighten the captive screws on the front panels using a 1/4-in. flat-blade screwdriver.

Step 4 Reconnect the power cables. If using the AC-input power shelf, connect the monitor cable. The DB-9 connector connects to the PEMF; the DB-25 connector connects to the optional AC-input power shelf. (Refer to Figure 5-6.)

Step 5 From the front of the server, reseat the server cards using the ejector levers and tighten the panel fasteners with a number 2 Phillips screwdriver. (Refer to Figure 5-8 and Figure 5-9.)

Step 6 Power ON the main power source circuits for the Cisco AS5850.

Step 7 If using the optional AC-input power shelf, plug the power supplies into their AC power sources.

Step 8 Power ON ( | ) the server using the power switches located on each PEMF front panel.

Step 9 Note the service maintenance on your Site Log sheet.

This completes the backplane removal and replacement procedure. The backplane is a passive design. Specific verification and troubleshooting instructions are considered unnecessary.

Troubleshooting

This section describes possible causes for specific symptom related to Cisco AS5850 hardware components and software configurations.

For system startup and subsystem troubleshooting, refer to Chapter 5 "Troubleshooting the Installation" in the Cisco AS5850 Universal Access Server Hardware Installation and Configuration Guide.

Common Misconfigurations

Incorrect ISDN switch-type
Orphan async interfaces
Encapsulation PPP missing
ISDN incoming-voice missing
Dialer group/dialer-list missing
Async mode interactive missing
Multilink bundle-name both not configured

AS5850 Problems

System/RSC

Symptom

Cisco AS5850 boots up with "boot" prompt.

Possible Cause

Invalid boot system statement in the config.
No/wrong image on flash card for the platform.
Image downloaded incorrectly.

Symptom

RSC shows "down" state.
OIR not detected.

Possible Cause

DSIC is not connected securely.
RSC has the incorrect image.
Faulty RSC.

Cards

Symptom

Cards not coming up.

Possible Cause

RSC is in the down state.
card not seated properly.
card not in the correct slot.
card is broken.

Controller T1

Symptom

Slips on T1 controllers.

Possible Cause

T1s from multiple switches (clocking problem).
Problematic T1 is used for clocking.
RSC is in free-running mode.

General Configuration

Symptom

The NAS was working okay, then it does not do what is expected.

Possible Cause

Configuration changed, do "diff.".
Equipment failure (port).
Telco line provision changed.

Symptom

Call does not authenticate.

Possible Cause

Incorrect aaa authentication .
Login/ppp authentication method not defined or not applied for dialer/group-async/virtual-template.
Misconfigured radius-server.

Symptom

Call connects and authenticates, but can not seem to get traffic across.

Possible Cause

Dialer-list not defined or not installed.
Route/data filter installed.
Port is in retrain constantly.
Incoming connection became part of an existing MLP bundle because account is shared.

Symptom

User has idle-timer/session timer installed but never disconnects.

Possible Cause

Make sure correct timer is installed.
Multicast traffic/routing update is resetting idle-timers.

Async Calls

Symptom

Async user gets fast busy.

Potential Cause:

ISDN PRI layer 2 is not up/channel busied out.
ISDN incoming-voice mode not configured.
Port can not be allocated (busied out, firmware download in progress).
DNIS screening is enabled and access-rejected.
ISDN switch-type reconfigured, NAS needs reload.

Symptom

Some users can connect but some can not.

Possible Cause

Incorrect password/modem problem.
Dialer caller xxxxxxxxxx configured and user does not deliver caller-id.
Telco provision problem.

Symptom

Async user's modem will not train-up or connect at low speed and retrains often.

Possible Cause

Check for slip seconds on the T1 controller.
Check for A/u-law, modemcap.
Check for client modem firmware version.
Check for client modem compatibility issues.

Interactive Async User

Symptom

Interactive Async user does not get Username Prompt.

Possible Cause

Need to hit return after connect.
Async-mode interactive not configured.

Interactive Users

Symptom

Interactive users can not authenticate.

Possible Cause

Incorrect method under aaa or method-list under line configuration.
Back-end authentication rejected (RADIUS/TACACS).

Symptom

Interactive user authenticates but PPP does not/cannot start (even after "ppp default").

Possible Cause

User is not authorized to start PPP based on RADIUS/TACACS profile.
Unable to assign an IP address.

Symptom

User authenticates and ppp appears to start but fails eventually.

Possible Cause

User is double authenticated.
- aaa authen ppp login if-needed radius
IP address allocation/ppp negotiation failure.

Dedicated-PPP Users

Symptom

Interactive async user can connect and authenticate, but dedicated ppp user can not authenticate.

Possible Cause

AAA authentication ppp not defined.
Autoselect ppp not defined under line.
Autoselect during-login not defined under line.
Back-end authentication rejected.

Symptom

User authenticates but gets disconnected.

Possible Cause

IP address could not be allocated - pool/dhcp.
PPP negotiation failed due to incompatible parameters.
MLP call but PPP multilink not enabled.

PPP Users

Symptom

User authenticated and successfully logged in but cannot get to anywhere.

Possible Cause

Port is in retrain.
User is treated as part of a multilink bundle.
Incorrectly defined data-filters.
Dialer-list x protocol ip permit is not defined.

Sync Calls

Symptom

Sync users gets "no answer" or "busy."

Possible Cause

Controller T1 / isdn layer 2 is down, channels busied out.
ISDN switch-type reconfigured, nas need reload.
DNIS screening is enabled and call is rejected due to radius server access-reject.
Telco provisioning problem.

MMPPP

Symptom

First channel/modem dial-in and connect fine, but second channel/modem does not connect to the same NAS.

Possible Cause

First channel/modem not negotiated as a MLP call.
PPP multilink not configured.

Symptom

First channel/modem dial-in and connect fine, but second channel/modem does not connect to the different NAS.

Possible Cause

SGBP not configured.
SGBP not succeeding.

RADIUS

Symptom

No response for Access/Accounting-Requests generated by NAS.

Possible Cause

Radius server/ports not reachable from NAS.
NAS not configured/recognized by RADIUS server.
Shared secret does not match.
Unreliable connection between NAS and RADIUS.

Symptom

Getting Access-Reject for Access-Request.

Possible Cause

User is not in the radius database/database needs reload.
Incorrectly formatted/configured radius user profile.
One of the check-items in profile does not match the corresponding value in Access-Request.

Symptom

Idle/Session timeout defined in RADIUS but not installed (MLP or PPP w/ 1-channel ISDN).

Possible Cause

Virtual-profile aaa not configured.

SGBP Troubleshooting

Debug Commands

debug sgbp hellos
debug sgbp errors

Table of Contents

Maintenance