The Cisco ASR 902 Router chassis includes a slot for optional redundant power supply. The redundant power supply option provides a second power supply to ensure that power to the chassis continues uninterrupted if one power supply fails or input power on one line fails. Redundancy is supported either with identical power supplies or a combination of AC and DC power supply. The Cisco ASR 902 Router supports current sharing between the power supplies.

A redundant power supply on the Cisco ASR 902 Router is recommended. Each power supply should be connected to separate independent power sources to ensure that the router maintains power in the event of a power interruption caused by an electrical failure, a wiring fault, or a tripped circuit breaker.

Caution

To comply with IEC 61850-3 (voltage interruptions), redundant power supplies with separately derived power feeds are required.

The Cisco ASR 902 Router DC power supply supports the Dying Gasp feature, which allows the router to provide an input power loss notification to the RSP so that the RSP can send appropriate SNMP traps or OAM messages and update log files on the router. With the DC power supply, the router supports a minimum input power loss detection time of 2 milliseconds (DC) and continued operation of at least 6 milliseconds (DC) after the notification.

Note	Continued DC power supply operation may vary for voltages other than +24/–48V.

Note	Dying Gasp is not supported on the ASR 900 RSP3 module with the 1200 W DC power supply.

LEDs are also provided on each power supply to indicate the status of the input power and the health of the power supply. For more information about the LEDs on the Cisco ASR 902 Router, see Troubleshooting.

The Cisco ASR 902 Router uses a +24/-48 DC voltage power supply (with DC voltage tolerance from -19 to -72 VDC).

The power supply provides 550W output power for the system. The power supply is field replaceable, hot swappable, and operates separately from the fan tray. The power supply contains a front panel with mounting screws, a handle for insertion and removal, and two status LEDs. No ON/OFF switch is provided.

The DC PSU models supported on the router are:

• A900-PWR550-D—Uses an Euro-style three-position terminal block connector ( Figure 1-2 )

• A900-PWR550-D-E—Uses a T-shaped connector ( Figure 1-3 )

• A900-PWR1200-D—Provides 975 W output power for system 12 V power with the A902-FAN-E module. As most of the system configurations using A900-RSP3C-200-S RSP modules require power exceeding 550 W, we recommend using the A900-PWR1200-D power supply with A900-RSP3C-200-S RSP modules. ( Figure 1-4 )

The AC PSU models supported on the router are:

• A900-PWR550-A—Provides 550 W power

• A900-PWR1200-D—Provides 1200 W power

The table below summarizes the input power specifications for the Cisco ASR 902 Router AC power supply units.

• A900-PWR1200-A—Provides 975 W output power for system 12 V power with the A902-FAN-E module. As most of the system configurations using A900-RSP3C-200-S RSP modules require power exceeding 550 W, we recommend using the A900-PWR1200-A power supply with A900-RSP3C-200-S RSP modules. ( see the figure below )

The Cisco ASR 902 Router uses a modular fan tray that is separate from the power supply. The A902-FAN-E is a fan tray containing eight (40 x 40 x 20 mm) fans and provides sufficient capacity to maintain operations indefinitely in the event of an individual fan failure. It has a 8-mm fan dust filter that prevents dust from entering the unit and avoids possible damage to the components. The fan tray is IEC60950-1 compliant.

The Cisco ASR 902 Router supports the following RSPs:

• A900-RSP2A-128—Provides 4-GB double data rate type three (DDR3) memory and 128-Gbps aggregate throughput.

• A900-RSP2A-64—Provides 4-GB double data rate type three (DDR3) memory and 64-Gbps aggregate throughput.

• A900-RSP3C-200-S—Provides 8 GB DDR3 memory, 64MB flash memory, 20 Mb of TCAM memory, 8 GB of SDRAM, 200 Gbps throughput, and a USB port for mass storage on the faceplate.

The Cisco ASR 902U Router supports the following RSPs:

• A900U-RSP2A-128—Provides 4-GB double data rate type three (DDR3) memory and 128-Gbps aggregate throughput.

• A900U-RSP2A-64—Provides 4-GB double data rate type three (DDR3) memory and 64-Gbps aggregate throughput.

Caution

The SD memory card is not field replaceable. Do not try to remove or replace it.

Note	The supported RSPs have different memory capacities, but they have the same interfaces and functionalities.

The following are the RSP features supported on the Cisco ASR 902 Router:

• Centralized data plane, timing, and control plane functions for the system
• High-level control of interface modules
• Management functionalities for the router
• Control plane (host) CPU and associated memory in which Cisco IOS-XE and platform-control software run
• Nonvolatile memory for storage of software images, configurations, and system files
• Enabling and monitoring the health and presence of fan trays, interface modules, and power supplies
• Field replacement

The RSP supports the following network timing interfaces:

• BITS input/output port—RJ48 jack
• 1 PPS input and output—Mini coax connectors
• 2.048 or 10 MHz input and output—Mini coax connectors
• Time of Day (ToD) —Shielded RJ45 jack

The figure below summarizes the interfaces on an RSP module.

The A900-RSP2A has the following front panel interfaces. For information on cable pinouts, see Pinouts.

• 1 USB Type-A Connector for USB flash (Label = MEM)
• 1 USB Type-A Connector for alternate console port (Label = CONSOLE)
• RJ45 Connector for Con/Aux (Label = CONSOLE)
• RJ48 Jack for BITS interface (Label = BITS)
• RJ48 Jack for Time-of-Day interface (Label= TOD)
• RJ45 Connector for Con/Aux (Label = MGMT ENET)
• 4 Mini-Coax Connectors (Label = 1PPS IN, 1PPS OUT, 10MHZ IN, 10MHZ OUT)

For more information about installing an RSP, see the RSP Installation section. For more information about RSP LEDs, see the RSP LEDs section.

• The GNSS module requires an active GPS/GNSS antenna with built-in Low-Noise Amplifier (LNA) for optimal performance. The antenna LNA amplifies the received satellite signals for two purposes:

  • Compensation of losses on the cable

  • Lifting the signal amplitude in the suitable range for the receiver frontend

  The Amplification required is 22dB gain + cable/connector loss + Splitter signal loss.

  The recommended range of LNA gain (LNA gain minus all cable and connector losses) at the connector of the receiver module is 22dB to 30dB with a minimum of 20dB and a maximum of 35dB.

• GNSS module provides 5V to the active antenna through the same RF input.

• Surge requirement:

  • GNSS modules have built-in ESD protections on all pins, including the RF-input pin. However, additional surge protection may be required if rooftop antennas are being connected, to meet the regulations and standards for lightning protection in the countries where the end-product is installed.

  • A lightning protection must be mounted at the place where the antenna cable enters the building. The primary lightning protection must be capable of conducting all potentially dangerous electrical energy to PE (Protective Earth).

  • Surge arrestors should support DC-pass and suitable for the GPS frequency range (1.575GHz) with low attenuation.

• Antenna Sky visibility:

  • GPS signals can only be received on a direct line of sight between antenna and satellite. The antenna should see as much as possible from the total sky. For proper timing, minimum of four satellites should be locked.

    Note	The antenna terminal should be earthed at the building entrance in accordance with the ANSI/NFPA 70, the National Electrical Code (NEC), in particular Section 820.93, Grounding of Outer Conductive Shield of a Coaxial Cable.

• Use a passive splitter if more than one GNSS modules are fed from a single antenna.

Note	The splitter should have all the RF ports capable of DC-pass, if the antenna needs to feed power from GNSS module.

For information on pinout, see GPS Port Pinouts.

The Gigabit Ethernet Small Form-Factor Pluggable (SFP) interface module provides eight Gigabit Ethernet SFP modules. The figure below shows the 8-port 1Gigabit Ethernet SFP interface module.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing an SFP Gigabit Ethernet module, see the Interface Module Installation.

The Gigabit Ethernet RJ45 interface module provides eight Gigabit Ethernet copper ports. The figure below shows the interface module.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing an RJ45 Gigabit Ethernet module, see the Interface Module Installation.

The 10-Gigabit Ethernet XFP interface module provides a single port supporting a 10-Gigabit Ethernet XFP module. The figure below shows the interface module.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing a 10-Gigabit Ethernet XFP module, see the Interface Module Installation.

The 16-port T1/E1 interface module provides connectivity for up to 16 T1/E1 ports through a 100-pin Amplimite connector. The T1/E1 interface module requires the use of a patch panel to provide RJ48 (T1) or BNC (E1) connectors. The figure below shows the interface module.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing a T1/E1 interface module, see theInterface Module Installation.

The 4-port OC3/STM-1 (OC-3) or 1-port OC12/STM-4 (OC-12) interface module can operate as up to four STM-1 interfaces.

Note	The optical interface module is designed for both OC-3 and OC-12 traffic.

The figure below shows the 4-port OC-3 interface module.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing an optical interface module, see the Interface Module Installation.

For more information about using the LEDs to troubleshoot the Cisco ASR 902 Router, see Troubleshooting.

The 8-port 1 Gigabit Ethernet SFP interface module with the 1-port 10 Gigabit Ethernet interface module is a high-density combination interface module. This module supports eight 1-Gigabit Ethernet SFP ports and one 10-Gigabit Ethernet SFP+ port.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing the 8X1 GE SFP + 1X10 SFP Gigabit Ethernet module, see the Interface Module Installation.

This 8-port 1 Gigabit Ethernet RJ45 (Copper) interface module with the 1-port 10 Gigabit Ethernet interface module is a high-density combination interface module. This module supports eight 1 Gigabit Ethernet Copper ports and one 10 Gigabit Ethernet SFP+ port.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing the 8X1 GE RJ45 + 1X10 SFP Gigabit Ethernet module, see the Interface Module Installation.

The high density 8x10 Gigabit Ethernet interface module supports eight 10 Gigabit Ethernet ports using SFP+ transceivers cages on the faceplate.

Note	It does not support XFP transceivers on the ports.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing a 8X10GE module, see the Interface Module Installation.

The 2-port 10 Gigabit Ethernet interface module provides a dual port supporting a 10 Gigabit Ethernet SFP+ and XFP module.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing the 2X10 GE SFP Gigabit Ethernet module, see the Interface Module Installation.

The dual port 40 Gigabit Ethernet interface module supports the 40 Gigabit Ethernet port. The 40G interface is supported using QSFP+ optics. The figure below shows the interface module.

For information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information about installing a 2X40GE module, see the Interface Module Installation.

The Cisco (A900-IMASER14A/S) is a 14-port serial interface module for the router. The Cisco ASR 902 Router module has the following interfaces:

• 12-in-1 Connector (6)—Supports synchronous and asynchronous RS-232 interfaces using EIA/TIA-232 DB-25 connectors.

• 68-Pin Connector (2)—Supports up to 8 RS-232 interfaces in full or half duplex mode using 4 RS-232 connectors (DB-25, DB-9, or RJ-45).

The Cisco A900-IMA6EM is a 6-port Ear and Mouth (E&M) interface module. The interface module provides the router with connectivity to tele-protection equipments. The front panel of the module consists of:

• six port RJ45 connectors

• two LED that display Power and Status

• one LED per RJ45 port

This image is not available in preview/cisco.com

For more information about installing the module, see the Interface Module Installation section.

The Cisco (A900-IMA4C3794) is a 4-port interface module that provides IEEE C37.94-2002 compliant Nx64 kbps optical interface ports to the router. The interfaces support 50/62.5 multimode fiber at 850 nm. The physical interfaces use 2.5 mm ST connectors.

The front panel of the module consists of:

• four ports of IEEE C37.94 interfaces

For more information about installing the module, see the Interface Module Installation section .

• One dual-port RJ11 FXO connector

• One 6-port RJ45 connector (shared between FXS and G.703)

The maximum operating temperature of the RSP3 module and the interface modules is less than the maximum operating temperature of the router. The IOS software decides the appropriate temperature thresholds to generate warnings, and shuts down the system when abnormally high temperature is detected.