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

• For more information about installing an RJ45 Gigabit Ethernet module, see the Installing the Interface Module section.
• To determine interfaces available on the RJ45 Gigabit Ethernet module, see the Interface Availability on Interface Modules section.

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

• For more information about installing a 10-Gigabit Ethernet XFP module, see the Installing the Interface Module section.
• To determine interfaces available on the 10-Gigabit Ethernet XFP module, see the Interface Availability on Interface Modules section.
• For information on supported SFPs, see the Cisco ASR 900 Series Aggregation Services Router Interface Modules Data Sheet at http://www.cisco.com/c/en/us/products/routers/asr-903-series-aggregation-services-routers/datasheet-listing.html.

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

• For more information about installing the 2X10 GE SFP Gigabit Ethernet module, see the Installing the Interface Module section.
• To determine interfaces available on the 2X10 GE SFP Gigabit Ethernet module, see the Interface Availability on Interface Modules section.
• For information on supported SFPs, see the Cisco ASR 900 Series Aggregation Services Router Interface Modules Data Sheet at http://www.cisco.com/c/en/us/products/routers/asr-903-series-aggregation-services-routers/datasheet-listing.html.

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.

The 8T1/E1 interface module provides connectivity for up to 8 x T1/E1 ports through RJ48C connectors on the front panel. The following figure shows the interface module.

• For more information about installing a 8 Port T1/E1 interface module, see the Installing the Interface Module section.
• To determine interfaces available on the 8 Port T1/E1 interface module, see the Interface Availability on Interface Modules section.
• For LED indicator information on the 8 Port T1/E1 interface module, see the 8 T1/E1 Interface Module LEDs section.
• For RJ45C pinout information on the 8 Port T1/E1 interface module, see the RJ45C Port Pinouts section.

Note	Cisco ASR-920-24SZ-IM Router does not support over-subscription mode. You must disable the ports as appropriate to restrict the system usage to 64 Gbps. Enabling all the interfaces in over-subscription mode can result in an unpredictable system performance.

The following table provides a snapshot of the interfaces available on supported interface modules:

The network interfaces are provided through fixed ports.

• GE SFP ports (fiber)—supports 100/1000 modes (ASR 920-24SZ-IM and ASR-920-24SZ-M)
• GE SFP ports (copper)—supports 10/100/1000 operation (ASR-920-24TZ-M)
• 10GE SFP+—supports 10G mode.

Note	Network timing interface is available only on Cisco ASR-920-24SZ-IM Router.

• BITS input or output—The BITS interfaces support clock recovery from either a T1 at 1.544 MHz or an E1 at 2.048 MHz, configurable by software. BITS interface is provided through a standard RJ-48 connector on the front panel.
• 1PPS input or output and ToD input or output—This shielded RJ-45 interface is used for input or output of time-of-day (ToD) and 1PPS pulses. ToD format includes both NTP and IEEE 1588-2008 time formats.

The same RS422 pins for 1PPS and TOD are shared between input and output directions. The direction for each can be independently configurable through software.

• GPS 10 Mhz input and output—10 MHz input for GPS Synchronization. This connector on the front panel can provide 10MHz output as well from Cisco ASR-920-24SZ-IM Router. The direction can be configured using software.
• GPS 1 PPS input and output—1 PPS input for GPS Synchronization. This connector on the front panel can provide 1 PPS output as well from Cisco ASR-920-24SZ-IM Router. The direction can be configured using software.

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router supports four dry contact alarm inputs through an RJ-45 jack on the front panel.

• Normally Open—indicates that no current flows through the alarm circuit and the alarm is generated when the current is flowing.

Each alarm input can be provisioned as critical, major, or minor.

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router have the following management interfaces:

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M routers support either AC or DC power supplies in a 1+1 redundant configuration. One AC and one DC power supply in the same router is also a supported configuration. The PSUs are hot-swappable. Load is shared between PSUs when both the PSUs are inserted and powered-up. Status LED provided on both AC and DC PSU indicates the status and output condition.

Note	DC PSU can be switched on or off using a switch on the front panel of the DC PSU.

Note	For DC PSU, the UVP and OVP limits vary depending on the input voltage applied at power up: For -48/-60 V: UVP= -36 Vdc and OVP = -72 Vdc For 24 V: UVP =18 Vdc and OVP = 32 Vdc

Note	This product requires surge protection as part of the building installation. To comply with the Telcordia GR-1089 NEBS standard for electromagnetic compatibility and safety, an external surge protective device (SPD) is required at the AC power service equipment.

Note	For DC systems, if a surge of more than 1KV is expected, add an appropriate external surge protective device.

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M routers have removable fan tray as part of the system. The fan tray is hot-swappable. The system is designed to operate at its maximum operating temperature of 70º C and at 65º C in case of failure of a single fan, for a maximum of four hours.

The dynamic fan-speed algorithm sets the fan speed based on the ASIC temperature.

Prior to Cisco IOS XE Cupertino Release 17.8.1, when the smart SFP was inserted, it would not function with the static fan-speed algorithm mode. This was resulting in the increase of the router's temperature.

Starting with Cisco IOS XE Cupertino Release 17.8.1, when the smart SFP is inserted, the switch from default dynamic fan-speed algorithm to static fan-speed algorithm helps the smart SFP to function efficiently.

Use the show platform fan-algorithm command to verify the fan-speed algorithm configuration for the router:

Router#show platform fan-algorithm
 
Fan Algorithm : Static
 
Router#

This section describes the different types of front panel LEDs and their behavior.

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router supports the following OIR operations:

• When an SFP is removed, there is no effect on traffic flowing on other ports.
• When an SFP is installed, the system initializes that port for operation based upon the current configuration. If the inserted SFP is incompatible with the current configuration for that port, the port does not become operational until the configuration is updated.
• Both power supplies are installed and active and the load may be shared between them or a single PSU could support the whole load. When a power supply is not working or the input cable is removed, the remaining power supply takes the entire load without disruption.
• Except for TDM IM, you can hot-swap an interface module with a similar interface module on Cisco ASR-920-24SZ-IM Router. For more information, see Hot-Swapping the Interface Module section.
• When a fan tray is removed or replaced, there is no need to power down the router. However, when the fan tray is removed from chassis the router shuts down automatically after some time, depending on the ambient temperature. The time duration before the router shuts down is shown in the table below:

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router support the following types of licenses:

• Port Licensing—Port Upgrade license is available as a "Pay as you Grow" model.
  • 1G upgrade license
  • 10G upgrade license
• Bulk licensing—Bulk port licensing allows you to enable all the ports with a single license.
• Timing license (1588)—Timing license is required if the router is used as a master clock.
• Advanced Metro IP Access
• Metro IP Access
• Metro Access (default)

The following methods are used to activate the above licenses:

• Cisco Software Licensing—The Cisco Software License Activation feature is a set of processes and components to activate Cisco software feature sets by obtaining and validating fee-based Cisco software licenses.

Note	Licenses generated by the Cisco Software Licensing are tied to the UDI of the chassis and a corresponding watchtower device certificate (WDC) is stored in the system.

• Cisco Smart Licensing—Smart Licensing is usage-based licensing where devices register with the Cisco Secure server.