The Cisco ASR 903 Router chassis includes a slot for an 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 903 Router supports current sharing between the power supplies.

A redundant power supply on the Cisco ASR 903 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 903 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 for 1200W 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 903 Router, see Troubleshooting.

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—Provides 550 W output power for system 12 V power. Uses a euro-style three-position terminal block connector.
• A900-PWR550-D-E—Provides 550 W output power for system 12 V power. Uses a T-shaped connector.

Note	The A900-PWR550-D and the A900-PWR550-E power supply can be used with the A900-RSP3C-400-S RSP modules only if the power consumption is within 550 W. However, A900-PWR1200-D is recommended.

• A900-PWR1200-D—Provides 975 W output power for system 12 V power with the A903-FAN module. As most of the system configurations using A900-RSP3C-400-S RSP modules require power exceeding 550 W, we recommend using the A900-PWR1200-D power supply with A900-RSP3C-400-S RSP modules.

The AC PSU models supported on the router are:

• A900-PWR550-A—Provides 550 W output power for system 12 V power. Uses an IEC 320 C14 type 15 Amp power receptacle connector.

The A900-PWR550-A power supply can be used with the A900-RSP3C-400-S RSP modules only if the power consumption is within 550 W. However, A900-PWR1200-A is recommended.

• A900-PWR1200-A—Provides 975 W output power for system 12 V power with the A903-FAN module. As most of the system configurations using A900-RSP3C-400-S RSP modules require power exceeding 550 W, we recommend using the A900-PWR1200-A power supply with A900-RSP3C-400-S RSP modules. See the figure below.

The Cisco ASR 903 Router uses a modular fan tray that is separate from the power supply. The fan tray contains twelve fans and provides sufficient capacity to maintain operation indefinitely in the event of an individual fan failure.

The A903-FAN-E is a fan tray containing twelve (40 x 40 x 20 mm) fans and provides sufficient capacity to maintain operation 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.

Air Plenum or air baffle assembly is used change the air flow pattern of the unit. When the router is installed with the plenum, the air flow pattern is changed from side-side to front-back. The air flow front-back pattern provides a rack installation bay with a cool front zone and hot rear zone. For installing the plenum, see Installing the Chassis in the Air Plenum.

Note	When the air plenum and the fan filter are installed in the chassis, the system operating temperature is limited to 55 degrees Celsius.

The air plenum is available from GAW. To order an air plenum, contact the Sales and Marketing support staff at GAW (see Table A-2 ).

The Cisco ASR 903 Router supports the following RSPs:

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

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

• A900-RSP3C-400-S—Provides 8 GB of SDRAM and non-volatile memory, 64MB flash memory, 40 Mb of TCAM memory, 400Gbps throughput.

• A900-RSP3C-200-S—Provides 8 GB of SDRAM and non-volatile memory, 64MB flash memory, 20 Mb of TCAM memory, 200Gbps throughput.

The Cisco ASR 903U 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.

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

Caution

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

Note	Installing a mix of RSP modules in the chassis is not supported.

The RSPs do not provide external network interfaces for user traffic. All network interfaces are provided via separate IMs.

A900-IMA2Z IM supports SFP+ and XFP on ports 0 and 1. Either SFP+ or XFP can be connected on each port. If both are connected on the same port, the port will go down.

The combination IMs (A900-IMA8S1Z, A900-IMA8T1Z) are not supported on the A900-RSP2-64 RSP module on the Cisco ASR 903 Router.

The table below is applicable for A900-RSP2A-128 and A900U-RSP2A-128 RSP modules.

The table below is applicable for A900-RSP2A-64 and A900U-RSP2A-64 RSP modules.

The table below is applicable for A900-RSP3C-400-S RSP module.

Note	If the license feature service-offload enable command is configured, then the following IMs are not supported in the router for RSP3: A900-IMA8S A900-IMA8T A900-IMA8S1Z A900-IMA8T1Z

Note	There are certain restrictions in using the interface modules on different slots with RSP3 module. Contact Cisco Sales/Support for the valid combinations.

Router# configure t
Router(config)# license feature service-offload enable

The table below is applicable for A900-RSP3C-200-S RSP module.

Note	If the license feature service-offload enable command is configured, then the following IMs are not supported in the router for RSP3: A900-IMA8S A900-IMA8T A900-IMA8S1Z A900-IMA8T1Z

Note	There are certain restrictions in using the interface modules on different slots with RSP3 module. Contact Cisco Sales/Support for the valid combinations.

Note	FAN OIR is applicable every time the IM based fan speed profile is switched to the IMA1C and IMA2F interface modules. Even though the IMs remain in the Out-of-Service state, they are still considered as present in the chassis.

The RSP provides the following features on the Cisco 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 IOS-XE and platform control software runs
• 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 and hot-swap capabilities

The Cisco ASR 903 Router chassis includes two RSP slots to allow for redundant RSPs. When the router uses redundant RSPs, one RSP operates in the active mode and the other operates in the hot standby mode. Removal or failure of the active RSP results in an automatic switchover to the standby RSP.

Note	If you are using redundant RSPs, both the RSPs must be of the same type because a mixed configuration of two different RSP types is not supported.

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) input/output port and 1 PPS input port—Shielded RJ45 jack

Network timing interfaces support redundancy in a redundant RSP configuration. Network timing interfaces on a redundant RSP remain in operation while the RSP is in hot standby mode.

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

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

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

• 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.

For information on pinout, see GPS Port Pinout.

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

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

The 8-port 1 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.

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

Note	1-port 10 Gigabit Ethernet interface modules are not supported in slots 4 and 5.

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

The high density 8-port 10 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.

The 8-port 10 Gigabit Ethernet interface module is supported in slot 0 on the router with the A900-RSP3C-200-S RSP module. Only 6 ports of the 8 are enabled. The ports enabled are 0, 1, 4, 5, 6, and 7.

Use the hw-module subslot command to enable the interface module in slot 0 of the router. Save the configuration and reload the router to activate the interface module.

To remove the configuration, use no hw-module subslot command.

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

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 8 Gigabit Ethernet SFP ports and 1 10 Gigabit Ethernet SFP+ port.

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

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 8 Gigabit Ethernet Copper ports and 1 10 Gigabit Ethernet SFP+ port.

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

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.

The 1-port 100 Gigabit Ethernet interface module supports one CPAK optics port.

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

The 2-port 100 Gigabit Ethernet Interface Module (N560-IMA2C) design supports only one 100G QSFP28 optics on Port 0. Port 1 is disabled with RSP3. It currently supports only one mode of operation with 100Gbps of traffic with RSP3.

For information on supported QSFP modules, see Cisco ASR 900 Series Interface Modules Data Sheet.

Limitations of 2X100 GE IM

After any QSFP28 100G optics is inserted, it takes approximately 10 seconds for the optics to be detected and the link to come up. We recommend this time delay for complete initialization and operation.

After inserting the cable or after unshutting the 100G interface, the 100G link may take approximately about 2 seconds to come up.

Note	QSFP-100G-SR4-S and QSFP-100G-LR4-S are the supported optics for 2X100GE IM for the release 16.11.1.

The dual port 40 Gigabit Ethernet interface module supports the 40 Gigabit Ethernet port. The 40GE 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 information on supported SFP modules, see Cisco ASR 900 Series Aggregation Services Routers Data Sheet.

For more information on port numbering, see Configuring 1-port 10 Gigabit Ethernet (1 X SFP+) / 1-port Gigabit Ethernet (1 X SFP) / 2-port Gigabit Ethernet (1 X CSFP) and 16-port Gigabit Ethernet (8 X CSFP) / 8-port Gigabit Ethernet (8 X SFP) Interface Module chapter of the Cisco ASR 900 Router Series Configuration Guide, Cisco IOS XE Everest 16.6.1.

The 16-port T1/E1 interface module provides connectivity for up to 16 T1/E1 ports through a 100-pin Amplimite connector. The 16-port 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.

The 32-port T1/E1 interface module provides connectivity for up to 32 T1/E1 ports through two 68-pin Tyco connectors. It is supported on the A900-RSP2A-64 module in slots 3, 4 and 5, and on the A900-RSP2A-128 on all slots.

The 32-port T1/E1 interface module requires the use of a patch panel to provide RJ48 or BNC connectors.

The 8-port T1/E1 interface module provides connectivity for up to 8 T1/E1 ports through RJ48C port connectors on the front panel. The figure below shows the interface module. For information on supported slots, see Supported RSPs.

The 48-port T1/E1 interface module provides connectivity for up to 48 T1/E1 ports through 3 high-density connectors on the front panel (as shown in figure 48-port T1/E1 Faceplate). Each port supports 16 TX and RX ports.

The 48-port T3/E3 interface module provides connectivity for up to 48 T3/E3 ports through 3 high-density connectors on the front panel (see the figure below). Each port supports 16 TX and RX ports.

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. The figure below shows the interface module.

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

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

Note	If OC48 is enabled, then the remaining 3 ports are disabled.

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

The 1-port OC-192 interface module with 8-port low rate CEM interface module is a high density combination interface module. This module supports 1 OC-192 port or 8 low rate CEM or 1 Gigabit Ethernet port.

The OC-192 interface modules are supported on slots 2, 3, 4 and 5 on the chassis.

Ports on the OC-192 are numbered from 1 to 8.

• Ports 0 to 7 are multi-rate ports, that support OC-3, OC-12, OC-48, Fast Ethernet interfaces, and the 1 Gigabit Ethernet interfaces.
• Port 8 is the 10 Gigabit Ethernet port that supports the OC-192 interfaces.

The ASR 900 1-Port OC-192 or 8-Port Low Rate CEM 20G Bandwidth Interface Module is a cost-effective interface module (IM) that supports CEM and Multiservice Gateway features on the OCn interfaces.

Note	The Multiservice Gateway features are not supported on this IM on Cisco IOS XE Release 16.12.1.

The ASR 900 1-Port OC-192 or 8-Port Low Rate CEM 20G Bandwidth Interface Module, 20G IM supports eight SFP optical interfaces supporting at OC-3/OC-12/OC-48/1G rates and a single SFP+ optical interface supporting at OC-192/10G.

This IM operates in two modes:

• 20G mode; uses two XFI lanes towards the system

• 10G mode; uses single XFI lane towards the system

The benefits of this IM are:

• Improves backplane efficiency

• Increases system capacity

• Increases client flexibility

The most important feature of the ASR 900 1-Port OC-192 or 8-Port Low Rate CEM 20G Bandwidth Interface Module, 20G IM is it provides more flexibility from the interface, which allows you to configure any interface speed on the OCn port irrespective of the IM bandwidth. The bandwidth restriction comes into effect only when the circuit is configured.

For example, you can configure the SFP+ port as an OC-192 and the other eight optical ports as OC-48 to have the total interface speed of 30G. However, if you configure only one STS-1 HO CEP on each port that will take only 9xSTS-1, which is equivalent to 500 Mbps (9 x 52Mbps x1.06) of the backplane traffic.

The Cisco (A900-IMASER14A/S) is a 14-port serial interface module for the router. The 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)

For more information about using the LEDs to troubleshoot the router, see LED Summary.

The Cisco (A900-IMA6EM) is a 6-port Ear and Mouth (E&M) interface module for the Cisco ASR 903 router. 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

For information on LEDs, see E & M Interface Module LEDs.

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

For more information, see Connecting Serial Cables and Serial Cable Pinouts.

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 850nm. The physical interfaces use 2.5mm ST connectors.

The front panel of the module consists of four ports of IEEE C37.94 interfaces.

For information on LEDs, see 4-Port C37.94 Interface Module LEDs.

The overtemperature detection trips at 75 degrees C +/- 5% with the ambient (inlet) trip point at 67 degrees C. This condition is reported to the processor as an interrupt, and the software takes action to generate the appropriate alarms.

The maximum operating temperature of RSP3 module and the interface modules is less than the maximum operating temperature of the Cisco ASR 903 router. The IOS software decides the appropriate temperature thresholds to generate warnings, and shuts down the system when abnormally high temperature is detected. For more information, see Maximum Operating Ambient Temperature Support for RSP3 Modules.