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Product Number: DS5814-DC-PEM=
The Cisco AS5800 Universal Access Server is equipped with two power entry modules (PEMs) in the dial shelf, which accept DC-input power either from your site DC source or from an optional AC-input power shelf, and distribute -48 VDC power to the dial shelf components. The PEMs provide power redundancy and load-sharing; however, a single PEM can power a fully configured system.
This document explains how to remove and replace the PEMs that make up the DC-input power supply. Also included are instructions for verifying and troubleshooting the installation.
The following sections are included in this document:
For information regarding the Cisco AS5800 Universal Access Server that is beyond the scope of this document or for additional information, use the following resources:
The Cisco AS5800 Universal Access Server is a high-density, ISDN and modem WAN aggregation system that provides both digital and analog call termination. It is intended to be used in service provider dial point-of-presence (POP), or centralized enterprise dial environments. The Cisco AS5800 Universal Access Server chassis components include a Cisco 5814 dial shelf and a Cisco 7206 router shelf. An optional AC power shelf is also available.
The dial shelf and router shelf are bundled, and can be ordered to support either AC or DC power. Included in the dial shelf is a blower assembly, filter module, and DC-input power entry modules (PEMs). Also included in the bundled system are ingress trunk cards, modem cards, dial shelf controller cards, Flash memory PCMCIA cards, cables, and Cisco IOS software. The dial shelf feature cards and host router shelf communicate via a dial shelf interconnect cable.
The dial shelf contains 14 slots (numbered 0 through 13 on the backplane) and can support up to 10 modem cards, 2 trunk cards, and 2 dial shelf controller cards (in the near future). The router shelf supports the dial shelf and performs all routing and packet processing. The router shelf also houses the main system software images.
Figure 1 shows a front view of a fully configured Cisco AS5800 Universal Access Server, and Figure 2 shows a rear view.
The Cisco AS5800 Universal Access Server is equipped with two power entry modules (PEMs) in the dial shelf, which accept DC-input power either from your site DC source or from an optional AC-input power shelf, and distribute -48 VDC power to the dial shelf components. The PEMs provide power redundancy and loadsharing; however, a single PEM can power a fully configured system.
The PEMs and the filter module are cooled by system air flow, which flows from the top to the back of the dial shelf chassis. The front and sides of the PEMs are perforated for minimum air flow restriction.
The PEMs support the following functions:
| Pin | Description | Pin | Description |
|---|---|---|---|
| 1 | -48V monitor | 6 | Not used |
| 2 | Not used | 7 | Not used |
| 3 | Breaker connect | 8 | -48V return monitor |
| 4 | Current monitor | 9 | Not used |
| 5 | Voltage monitor | 10 | 15V_BIAS |
The PEMs are located on either side of the filter module below a removable rear cover. You install the PEMs in the dial shelf from the back of the dial shelf chassis and plug them into the backplane.
Figure 3 shows the location of the PEMs as viewed from the dial shelf rear.
The PEMs contain two LEDs on the front panel--POWER and MISWIRE. The power LED indicates that input voltage is present, and the PEM circuit breaker is on; the miswire LED should remain off, but lights if the two DC conductors entering the PEM DC-input power terminal block (see Figure 3) are reversed.
The PEMs provide -48V DC power, which is distributed through the filter module to the dial shelf backplane. 15 VDC is provided to the analog isolators in the filter module. The PEMs suffer no damage if any or all outputs have no load (no load occurs when there are no cards plugged into the backplane), or if the maximum input voltage is exceeded; however, input voltages that exceed 75 volts will eventually trip the PEM 60-amp circuit breaker, and you might have to reset the breaker as needed.
Table 3 lists DC output voltage and current specifications.
| Power | Description |
|---|---|
Voltage to backplane | |
|
-38 VDC |
Current | |
|
3.0A |
| Circuit breaker | 50A |
Table 4 lists the DC-input power supply environmental specifications, which are designed to meet NEC, NEBS, and ETSI requirements.
| Specification | Description |
|---|---|
| Cooling | Maximum inlet air temperature is 131° F (55° C) |
Temperature | |
|
23° F to 131° F (-5° C to 55° C) |
Humidity | |
|
10% to 90%, noncondensing |
Altitude | |
|
9,843 ft (3,000 m) at 104° F (40° C) |
Thermal shock | |
|
23° F to 113° F (-5° C to 45° C) at 0.5° C per minute |
Vibration | |
|
1.12 Grms from 3 to 500 Hz |
| Regulatory compliance | ENG-5769 UL 1950 CSA 22.2-950-95 EN 60 950 ACA TS001, AS3260 |
This section provides safety and ESD-prevention guidelines to help you avoid injury to yourself and avoid damage to the equipment.The following safety guidelines are recommended when working with any equipment that connects to electrical power or telephone wiring:
 | Caution Terminal blocks may be energized. Ensure that the power source circuit breaker is disconnected, and the PEM power switch is in the OFF (O) position before accessing terminals. |
The following guidelines are recommended when working with any equipment that is connected to telephone wiring or to other network cabling:
Electrostatic discharge (ESD) damages equipment and impairs electrical circuitry. ESD occurs when printed circuit boards are improperly handled, and results in complete or intermittent failures.
The system feature cards and dial shelf controller cards consist of a printed circuit board that is fixed in a metal carrier. Electromagnetic interference (EMI) shielding, connectors, and a handle are integral components of the carrier. Handle the system feature cards and dial shelf controller cards by their carrier edges and ejector levers only; never touch the printed circuit board components or connector pins.
Although the metal carrier helps to protect the printed circuit boards from ESD, wear a preventive antistatic strap whenever handling the dial shelf feature cards or dial shelf controller cards, or the router shelf network processing engine, I/O controller, or port adapters. Ensure that the strap makes good skin contact and connect the strap's clip to an unpainted chassis surface to safely channel unwanted ESD voltages to ground.
If no wrist strap is available, ground yourself by touching the metal part of the chassis.
The following guidelines are recommended to prevent ESD damage:
Safety warnings appear throughout this publication in procedures that, if performed incorrectly, may harm you. A warning symbol precedes each warning statement.
 | Warning This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Waarschuwing Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van standaard maatregelen om ongelukken te voorkomen. Voor vertalingen van de waarschuwingen die in deze publicatie verschijnen, kunt u het document Regulatory Compliance and Safety Information (Informatie over naleving van veiligheids- en andere voorschriften) raadplegen dat bij dit toestel is ingesloten.
Varoitus Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan. Ennen kuin työskentelet minkään laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista. Tässä julkaisussa esiintyvien varoitusten käännökset löydät laitteen mukana olevasta Regulatory Compliance and Safety Information -kirjasesta (määräysten noudattaminen ja tietoa turvallisuudesta).
Attention Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant causer des blessures ou des dommages corporels. Avant de travailler sur un équipement, soyez conscient des dangers posés par les circuits électriques et familiarisez-vous avec les procédures couramment utilisées pour éviter les accidents. Pour prendre connaissance des traductions d'avertissements figurant dans cette publication, consultez le document Regulatory Compliance and Safety Information (Conformité aux règlements et consignes de sécurité) qui accompagne cet appareil.
Warnung Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem Gerät beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur Vermeidung von Unfällen bewußt. Übersetzungen der in dieser Veröffentlichung enthaltenen Warnhinweise finden Sie im Dokument Regulatory Compliance and Safety Information (Informationen zu behördlichen Vorschriften und Sicherheit), das zusammen mit diesem Gerät geliefert wurde.
Avvertenza Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di incidenti. La traduzione delle avvertenze riportate in questa pubblicazione si trova nel documento Regulatory Compliance and Safety Information (Conformità alle norme e informazioni sulla sicurezza) che accompagna questo dispositivo.
Advarsel Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til personskade. Før du utfører arbeid på utstyr, må du vare oppmerksom på de faremomentene som elektriske kretser innebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker. Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen, kan du se i dokumentet Regulatory Compliance and Safety Information (Overholdelse av forskrifter og sikkerhetsinformasjon) som ble levert med denne enheten.
Aviso Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar danos físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os perigos relacionados com circuitos eléctricos, e com quaisquer práticas comuns que possam prevenir possíveis acidentes. Para ver as traduções dos avisos que constam desta publicação, consulte o documento Regulatory Compliance and Safety Information (Informação de Segurança e Disposições Reguladoras) que acompanha este dispositivo.
¡Advertencia! Este símbolo de aviso significa peligro. Existe riesgo para su integridad física. Antes de manipular cualquier equipo, considerar los riesgos que entraña la corriente eléctrica y familiarizarse con los procedimientos estándar de prevención de accidentes. Para ver una traducción de las advertencias que aparecen en esta publicación, consultar el documento titulado Regulatory Compliance and Safety Information (Información sobre seguridad y conformidad con las disposiciones reglamentarias) que se acompaña con este dispositivo.
Varning! Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till personskada. Innan du utför arbete på någon utrustning måste du vara medveten om farorna med elkretsar och känna till vanligt förfarande för att förebygga skador. Se förklaringar av de varningar som förkommer i denna publikation i dokumentet Regulatory Compliance and Safety Information (Efterrättelse av föreskrifter och säkerhetsinformation), vilket medföljer denna anordning.
This section provides a list of tools and parts you need, and explains how to remove and replace the PEMs in the dial shelf 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 PEM at that time. Refer to the document AC-Input Power Shelf and Power Supply Installation and Replacement (Part Number 78-4659-xx) for installation and replacement instructions. |
The following parts and tools are required to remove and replace the PEMs. If you need additional equipment, contact a service representative for ordering information.
The following procedure for hot swapping a PEM assumes you are not using the optional AC-input power shelf, and that each PEM in your dial shelf is connected to a separate DC power source. If you are removing and replacing a PEM in an AC-configured system, you must perform the replacement during a scheduled maintenance time and power off the entire system.
| 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. |
To remove a PEM, complete the following steps:
Step 1 Power OFF the central office circuit breaker connected to the PEM 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 PEM front panel. (See Figure 4.)
| Caution Terminal blocks may be energized. Ensure that the power source circuit breaker is disconnected, and the PEM power switch is in the OFF (O) position before accessing terminals. |
Step 4 Using a 1/4-inch flat-blade screwdriver, disconnect the DC cables from the DC-input power terminal block. (See Figure 4.)
Step 5 Unplug the alarm cable from the bell alarm terminal block. (See Figure 4.)
Step 6 Using a 1/4-inch flat-blade screwdriver, loosen the captive screws on the PEM front panel.
Step 7 Grasp the handle and carefully pull the PEM from the backplane connectors using a gentle rocking motion; then remove the PEM from the DC power supply chassis. (See Figure 5.)
This completes the PEM removal process. Proceed to the section "Replacing a Power Entry Module."
To install a new PEM, complete the following steps. (Refer to Figure 5 to locate the PEMs in the dial shelf.)
Step 1 Grasp the PEM handle and carefully align the PEM with the DC-input power supply bay.
Step 2 Slide the PEM into the power supply bay until it is fully seated and connected to the backplane connectors.
Step 3 Using a 1/4-inch flat-blade screwdriver, tighten the captive screws on the PEM front panel.
Step 4 Plug the alarm cables into the bell alarm terminal block. (See Figure 5.)
This completes the procedure for replacing a PEM in the dial shelf. To connect the PEM power cables and power on the PEM, proceed to the section "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 PEM to your DC-input power source, complete the following steps:
Step 1 Locate the DC terminal block located on the dial shelf PEM front panel and loosen the connector screws using a 1/4-inch flat-blade screw driver. (See Figure 6.)
Step 2 Strip the DC power cable of its outer insulation to expose about 1/2-inch of copper wires.
Step 3 Connect the power cable stripped wires to the DC terminal block on the PEM and securely tighten the terminal block connector screws. (See Figure 6)
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 PEM.
Step 6 Power ON the central office circuit breaker connected to the PEM you are replacing.
Step 7 Power ON ( | ) the power switch located on the PEM front panel. (See Figure 4.)
This completes the procedure for replacing a PEM and connecting to your DC power source. Proceed to the section "Verifying and Troubleshooting the Installation" for installation troubleshooting tips.
If you are using the optional AC-input power shelf, you cannot remove and replace a PEM 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 PEM at that time. Refer to the document AC-Input Power Shelf and Power Supply Installation and Replacement (Part Number 78-4659-xx) for installation and replacement instructions. |
To complete the installation, verify the power supply LEDs operate properly and that you have wired the DC-input connections correctly. Each PEM contains two LEDs on the front panel--POWER and MISWIRE. (Refer to Figure 4.)
Regulatory compliance and safety information is contained in the Regulatory Compliance and Safety Information document that shipped with your system.
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