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This page presents the Cisco ISR routers simulated in Cisco TM Packet Tracer 7.3.1 and the WAN Interface Cards (WIC) and Network Modules (NM) available for those equipments.
Router devices emulated in Cisco Packet Tracer
Cisco 1841 ISR router
The Cisco 1841 Integrated Services Router provides two fixed 10/100 (100BASE-TX) Ethernet ports, two integrated High-Speed WAN Interface Card (HWIC) slots that are compatible with WAN Interface Card (WICs) and Voice/WAN Interface Cards (VWICs), and one internal Advanced Integration Module (AIM) slot.
Cisco 2620XM ISR router
The Cisco 2620XM Multiservice Router provides a one-network module slot platform with one fixed 10/100 (100BASE-TX) Ethernet port, two integrated WAN Interface Card (WIC) slots, and one Advanced Integration Module (AIM) slot.
Cisco 2621XM ISR router
The Cisco 2621XM Multiservice Router provides a one-network module slot platform with two fixed 10/100 (100BASE-TX) Ethernet ports, two integrated WAN Interface Card (WIC) slots, and one Advanced Integration Module (AIM) slot.
The 2621XM supports the same modules that the 2620XM supports.
Cisco 2811 ISR router
The Cisco 2811 Integrated Services Router provides one Enhanced Network-Module slot with two fixed 10/100 (100BASE-TX) Ethernet ports, four integrated High-Speed WAN Interface Card (HWIC) slots that are compatible with WAN Interface Card (WICs), Voice Interface Cards (VICs) and Voice/WAN Interface Cards (VWICs), and dual Advanced Integration Module (AIM) slots.
Cisco 1941 ISR router
The Cisco 1941 Integrated Services Router (ISR) delivers highly secure data, mobility, and application services. Key features include two integrated 10/100/1000 Ethernet ports, 2 enhanced High-Speed WAN Interface Card slots, HWIC1 Internal Services Module slot, Fully integrated power distribution to modules supporting 802.3af Power over Ethernet (PoE) and Cisco Enhanced PoE.
Cisco 2901 ISR router
The Cisco 2901 Integrated Services Router (ISR) has been designed to delivers data, voice, video, and application services for branch offices. It includes 2 integrated 10/100/1000 Ethernet ports and 4 enhanced high-speed WAN interface card slots. This router key features are hardware-accelerated VPN encryption, integrated threat control, and 802.3af Power over Ethernet (PoE).
Cisco 2911 ISR router
The Cisco 2911 Integrated Services Router (ISR) provides 2 integrated 10/100/1000 Ethernet ports, 4 enhanced high-speed WAN interface card (WIC) slots, 2 onboard digital signal processor (DSP) slots and 1 onboard Internal Service Module for application services.
Cisco 2901 Hwic Slots Login
Cisco 819 ISR router
The Cisco 819 Integrated Services Router (ISR) supports machine-to-machine (M2M) applications that can enable enterprises to use 3G wireless WAN network services.
Cisco 829 ISR router
Cisco 829 Industrial Integrated Services Routers provide highly secure, reliable, and easy-to-manage 3G/4G LTE WAN cellular and Wireless LAN connectivity for mobile environments.
Cisco CGR 1240 rugged router
The CGR 1240 is a ruggedized communication platform, designed for use in Field Area Network (FAN) power distribution grids that require outdoor, pole-mounted routers. The FAN is a distribution system in which power generation and transmission are linked to the power consumers.
Cisco Hwic 1fe
Cisco 4321 ISR router (added in Cisco Packet Tracer 7.1)
Added in Packet Tracer 7.1, the Cisco 4000 Series Integrated Services Routers (ISR) revolutionize WAN communications in the enterprise branch. With new levels of built-in intelligent network capabilities and convergence, the routers specifically address the growing need for application-aware networking in distributed enterprise sites.
Cisco 4331 Integrated Services Router (added in Cisco Packet Tracer 7.3)
Added in Cisco Packet Tracer 7.3, Cisco ISR 4331 and ISR 4321 feature Cisco IOS image resilience through secure boot-image and secure boot-config commands and add network programmability support to Packet Tracer through NETCONF / YANG protocols which are topics of the CCNP Enterprise ENCOR exam. Cisco ISR 4000 series support a large range of WAN or LAN connectivity options such as T1, T3/, serial, 10Gigabit Ethernet, and 4G LTE capabilities. It's network programmability capabilities through NETCONF / YANG model allow operationnal cost savings and makes configuration of a large branch offices number easier.
WIC modules
Module | Description |
| WIC-1AM | The WIC-1AM provides one internal V.90 analog modems. This WIC can be used for basic telephone service connections. The WIC-1AM uses one port for connection to a standard telephone line, and the other port can be connected to a basic analog telephone for use when the modem is idle. |
| WIC-1ENET | The WIC-1ENET is a single-port 10 Mbps Ethernet interface card, for use with 10BASE-T Ethernet LANs. |
| WIC-1T | The WIC-1T provides a single port serial connection to remote sites or legacy serial network devices such as alarm systems, Synchronous Data Link Control (SDLC) concentrators, and packet over SONET devices. Sync Max Speed : 2048 Mbit/s |
| WIC-2AM | The WIC-2AM card features dual RJ-11 connectors, which are used for basic telephone service connections. The WIC-2AM has two internal V.90 analog modems to allow multiple data communication connections. These WICs can be used for incoming or outgoing analog modem calls. |
| WIC-2T | The 2-port asynchronous/synchronous serial network module provides flexible multi-protocol support, with each port individually configurable in synchronous or asynchronous mode, offering mixed media dial support in a single chassis. Applications for asynchronous/synchronous support include: - Low speed WAN aggregation (up to 128 Kbps), |
| HWIC-4ESW | The HWIC-4ESW provides four switching ports. |
| HWIC-8A | New module included in CiscoPacket Tracer 6.0.1Cisco ISR routers. This serial modules allows out of band management of Cisco networking devices through their console port. The HWIC-8A module allows the connection of 8 console cables using the octal cable, each serial connection being mapped to a TCP port for telnet access. |
| WIC-Cover | The WIC cover plate provides protection for the internal electronic components. It also helps maintain adequate cooling by normalizing airflow. |
Network modules (NM)
Module | Description |
| NM-1E | The NM-1E features a single Ethernet port that can connect a LAN backbone which can also support either six PRI connections to aggregate ISDN lines, or 24 synchronous/asynchronous ports. |
| NM-1E2W | The NM-1E2W provides a single Ethernet port with two WIC slots that can support a single Ethernet LAN, together with two serial/ISDN backhaul lines, and still allow multiple serial or ISDN in the same chassis. |
| NM-1FE-FX | The NM-1FE-FX Module provides one Fast-Ethernet interface for use with fiber media. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. Single port network modules offer autosensing 10/100BaseTX or 100BaseFX Ethernet. |
| NM-1FE-TX | The NM-1FE-TX Module provides one Fast-Ethernet interface for use with copper media. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. Single port network modules offer autosensing 10/100BaseTX or 100BaseFX Ethernet. The TX (copper) version supports virtual LAN (VLAN) deployment. |
| NM-1FE2W | The NM-1FE2W Module provides one Fast-Ethernet interface for use with copper media, in addition to two Wan Interface Card expansion slots. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. Single port network modules offer autosensing 10/100BaseTX or 100BaseFX Ethernet. The TX (copper) version supports virtual LAN (VLAN) deployment. |
| NM-2E2W | The NM-2E2W provides two Ethernet ports with two WIC slots that can support two Ethernet LANs, together with two serial/ISDN backhaul lines, and still allow multiple serial or ISDN in the same chassis. |
| NM-2FE2W | The NM-2FE2W Module provides two Fast-Ethernet interfaces for use with copper media, in addition to two Wan Interface Card expansion slots. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. |
NM-2W | The NM-2W Module provides two WAN Interface Card expansion slots. It can be used with a broad range of interface cards, supporting a diverse array of physical media and network protocols. |
| NM-4A/S | The 4-port asynchronous/synchronous serial network module provides flexible multi-protocol support, with each port individually configurable in synchronous or asynchronous mode, offering mixed-media dial support in a single chassis. Applications for Asynchronous/Synchronous support include: Low speed WAN aggregation (up to 128 Kbps), dial-up modem support, Async or Sync connections to management ports of other equipment, and transport of legacy protocols such as Bi-sync and SDLC. |
| NM-4E | The NM-4E features four Ethernet ports for multifunction solutions that require higher-density Ethernet than the mixed-media network modules. |
| NM-8A/S | The 8-port asynchronous/synchronous serial network module provides flexible multi-protocol support, with each port individually configurable in synchronous or asynchronous mode, offering mixed-media dial support in a single chassis. Applications for Asynchronous/Synchronous support include: Low speed WAN aggregation (up to 128 Kbps), dial-up modem support, Async or Sync connections to management ports of other equipment, and transport of legacy protocols such as Bi-sync and SDLC. |
| NM-8AM | The NM-8AM Integrated V.92 analog modem network module provides cost-effective analog telephone service connectivity for lower-density remote-access service (RAS), dial-out and fax-out modem access, asynchronous dial-on-demand routing (DDR) plus dial backup, and remote router management. Both the 8-port and 16-port versions use RJ-11 jacks to connect the integrated modems to basic analog telephone lines on the public switched telephone network (PSTN) or private telephony systems. |
| NM-Cover | The NM cover plate provides protection for the internal electronic components. It also helps maintain adequate cooling by normalizing airflow. |
This page presents the Cisco ISR routers simulated in Cisco TM Packet Tracer 7.3.1 and the WAN Interface Cards (WIC) and Network Modules (NM) available for those equipments.
Router devices emulated in Cisco Packet Tracer
Cisco 1841 ISR router
The Cisco 1841 Integrated Services Router provides two fixed 10/100 (100BASE-TX) Ethernet ports, two integrated High-Speed WAN Interface Card (HWIC) slots that are compatible with WAN Interface Card (WICs) and Voice/WAN Interface Cards (VWICs), and one internal Advanced Integration Module (AIM) slot.
Cisco 2620XM ISR router
The Cisco 2620XM Multiservice Router provides a one-network module slot platform with one fixed 10/100 (100BASE-TX) Ethernet port, two integrated WAN Interface Card (WIC) slots, and one Advanced Integration Module (AIM) slot.
Cisco 2621XM ISR router
The Cisco 2621XM Multiservice Router provides a one-network module slot platform with two fixed 10/100 (100BASE-TX) Ethernet ports, two integrated WAN Interface Card (WIC) slots, and one Advanced Integration Module (AIM) slot.
The 2621XM supports the same modules that the 2620XM supports. Homemade slot machine funny gif.
Cisco 2811 ISR router
The Cisco 2811 Integrated Services Router provides one Enhanced Network-Module slot with two fixed 10/100 (100BASE-TX) Ethernet ports, four integrated High-Speed WAN Interface Card (HWIC) slots that are compatible with WAN Interface Card (WICs), Voice Interface Cards (VICs) and Voice/WAN Interface Cards (VWICs), and dual Advanced Integration Module (AIM) slots.
Cisco 1941 ISR router
The Cisco 1941 Integrated Services Router (ISR) delivers highly secure data, mobility, and application services. Key features include two integrated 10/100/1000 Ethernet ports, 2 enhanced High-Speed WAN Interface Card slots, HWIC1 Internal Services Module slot, Fully integrated power distribution to modules supporting 802.3af Power over Ethernet (PoE) and Cisco Enhanced PoE.
Network modules (NM)
Module | Description |
| NM-1E | The NM-1E features a single Ethernet port that can connect a LAN backbone which can also support either six PRI connections to aggregate ISDN lines, or 24 synchronous/asynchronous ports. |
| NM-1E2W | The NM-1E2W provides a single Ethernet port with two WIC slots that can support a single Ethernet LAN, together with two serial/ISDN backhaul lines, and still allow multiple serial or ISDN in the same chassis. |
| NM-1FE-FX | The NM-1FE-FX Module provides one Fast-Ethernet interface for use with fiber media. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. Single port network modules offer autosensing 10/100BaseTX or 100BaseFX Ethernet. |
| NM-1FE-TX | The NM-1FE-TX Module provides one Fast-Ethernet interface for use with copper media. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. Single port network modules offer autosensing 10/100BaseTX or 100BaseFX Ethernet. The TX (copper) version supports virtual LAN (VLAN) deployment. |
| NM-1FE2W | The NM-1FE2W Module provides one Fast-Ethernet interface for use with copper media, in addition to two Wan Interface Card expansion slots. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. Single port network modules offer autosensing 10/100BaseTX or 100BaseFX Ethernet. The TX (copper) version supports virtual LAN (VLAN) deployment. |
| NM-2E2W | The NM-2E2W provides two Ethernet ports with two WIC slots that can support two Ethernet LANs, together with two serial/ISDN backhaul lines, and still allow multiple serial or ISDN in the same chassis. |
| NM-2FE2W | The NM-2FE2W Module provides two Fast-Ethernet interfaces for use with copper media, in addition to two Wan Interface Card expansion slots. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. |
NM-2W | The NM-2W Module provides two WAN Interface Card expansion slots. It can be used with a broad range of interface cards, supporting a diverse array of physical media and network protocols. |
| NM-4A/S | The 4-port asynchronous/synchronous serial network module provides flexible multi-protocol support, with each port individually configurable in synchronous or asynchronous mode, offering mixed-media dial support in a single chassis. Applications for Asynchronous/Synchronous support include: Low speed WAN aggregation (up to 128 Kbps), dial-up modem support, Async or Sync connections to management ports of other equipment, and transport of legacy protocols such as Bi-sync and SDLC. |
| NM-4E | The NM-4E features four Ethernet ports for multifunction solutions that require higher-density Ethernet than the mixed-media network modules. |
| NM-8A/S | The 8-port asynchronous/synchronous serial network module provides flexible multi-protocol support, with each port individually configurable in synchronous or asynchronous mode, offering mixed-media dial support in a single chassis. Applications for Asynchronous/Synchronous support include: Low speed WAN aggregation (up to 128 Kbps), dial-up modem support, Async or Sync connections to management ports of other equipment, and transport of legacy protocols such as Bi-sync and SDLC. |
| NM-8AM | The NM-8AM Integrated V.92 analog modem network module provides cost-effective analog telephone service connectivity for lower-density remote-access service (RAS), dial-out and fax-out modem access, asynchronous dial-on-demand routing (DDR) plus dial backup, and remote router management. Both the 8-port and 16-port versions use RJ-11 jacks to connect the integrated modems to basic analog telephone lines on the public switched telephone network (PSTN) or private telephony systems. |
| NM-Cover | The NM cover plate provides protection for the internal electronic components. It also helps maintain adequate cooling by normalizing airflow. |
This page presents the Cisco ISR routers simulated in Cisco TM Packet Tracer 7.3.1 and the WAN Interface Cards (WIC) and Network Modules (NM) available for those equipments.
Router devices emulated in Cisco Packet Tracer
Cisco 1841 ISR router
The Cisco 1841 Integrated Services Router provides two fixed 10/100 (100BASE-TX) Ethernet ports, two integrated High-Speed WAN Interface Card (HWIC) slots that are compatible with WAN Interface Card (WICs) and Voice/WAN Interface Cards (VWICs), and one internal Advanced Integration Module (AIM) slot.
Cisco 2620XM ISR router
The Cisco 2620XM Multiservice Router provides a one-network module slot platform with one fixed 10/100 (100BASE-TX) Ethernet port, two integrated WAN Interface Card (WIC) slots, and one Advanced Integration Module (AIM) slot.
Cisco 2621XM ISR router
The Cisco 2621XM Multiservice Router provides a one-network module slot platform with two fixed 10/100 (100BASE-TX) Ethernet ports, two integrated WAN Interface Card (WIC) slots, and one Advanced Integration Module (AIM) slot.
The 2621XM supports the same modules that the 2620XM supports. Homemade slot machine funny gif.
Cisco 2811 ISR router
The Cisco 2811 Integrated Services Router provides one Enhanced Network-Module slot with two fixed 10/100 (100BASE-TX) Ethernet ports, four integrated High-Speed WAN Interface Card (HWIC) slots that are compatible with WAN Interface Card (WICs), Voice Interface Cards (VICs) and Voice/WAN Interface Cards (VWICs), and dual Advanced Integration Module (AIM) slots.
Cisco 1941 ISR router
The Cisco 1941 Integrated Services Router (ISR) delivers highly secure data, mobility, and application services. Key features include two integrated 10/100/1000 Ethernet ports, 2 enhanced High-Speed WAN Interface Card slots, HWIC1 Internal Services Module slot, Fully integrated power distribution to modules supporting 802.3af Power over Ethernet (PoE) and Cisco Enhanced PoE.
Cisco 2901 ISR router
The Cisco 2901 Integrated Services Router (ISR) has been designed to delivers data, voice, video, and application services for branch offices. It includes 2 integrated 10/100/1000 Ethernet ports and 4 enhanced high-speed WAN interface card slots. This router key features are hardware-accelerated VPN encryption, integrated threat control, and 802.3af Power over Ethernet (PoE).
Cisco 2911 ISR router
The Cisco 2911 Integrated Services Router (ISR) provides 2 integrated 10/100/1000 Ethernet ports, 4 enhanced high-speed WAN interface card (WIC) slots, 2 onboard digital signal processor (DSP) slots and 1 onboard Internal Service Module for application services.
Cisco 819 ISR router
The Cisco 819 Integrated Services Router (ISR) supports machine-to-machine (M2M) applications that can enable enterprises to use 3G wireless WAN network services.
Cisco 829 ISR router
Cisco 829 Industrial Integrated Services Routers provide highly secure, reliable, and easy-to-manage 3G/4G LTE WAN cellular and Wireless LAN connectivity for mobile environments.
Cisco CGR 1240 rugged router
The CGR 1240 is a ruggedized communication platform, designed for use in Field Area Network (FAN) power distribution grids that require outdoor, pole-mounted routers. The FAN is a distribution system in which power generation and transmission are linked to the power consumers.
Cisco 4321 ISR router (added in Cisco Packet Tracer 7.1)
Added in Packet Tracer 7.1, the Cisco 4000 Series Integrated Services Routers (ISR) revolutionize WAN communications in the enterprise branch. With new levels of built-in intelligent network capabilities and convergence, the routers specifically address the growing need for application-aware networking in distributed enterprise sites.
Cisco 4331 Integrated Services Router (added in Cisco Packet Tracer 7.3)
Added in Cisco Packet Tracer 7.3, Cisco ISR 4331 and ISR 4321 feature Cisco IOS image resilience through secure boot-image and secure boot-config commands and add network programmability support to Packet Tracer through NETCONF / YANG protocols which are topics of the CCNP Enterprise ENCOR exam. Cisco ISR 4000 series support a large range of WAN or LAN connectivity options such as T1, T3/, serial, 10Gigabit Ethernet, and 4G LTE capabilities. It's network programmability capabilities through NETCONF / YANG model allow operationnal cost savings and makes configuration of a large branch offices number easier.
WIC modules
Module | Description |
| WIC-1AM | The WIC-1AM provides one internal V.90 analog modems. This WIC can be used for basic telephone service connections. The WIC-1AM uses one port for connection to a standard telephone line, and the other port can be connected to a basic analog telephone for use when the modem is idle. |
| WIC-1ENET | The WIC-1ENET is a single-port 10 Mbps Ethernet interface card, for use with 10BASE-T Ethernet LANs. |
| WIC-1T | The WIC-1T provides a single port serial connection to remote sites or legacy serial network devices such as alarm systems, Synchronous Data Link Control (SDLC) concentrators, and packet over SONET devices. Sync Max Speed : 2048 Mbit/s |
| WIC-2AM | The WIC-2AM card features dual RJ-11 connectors, which are used for basic telephone service connections. The WIC-2AM has two internal V.90 analog modems to allow multiple data communication connections. These WICs can be used for incoming or outgoing analog modem calls. |
| WIC-2T | The 2-port asynchronous/synchronous serial network module provides flexible multi-protocol support, with each port individually configurable in synchronous or asynchronous mode, offering mixed media dial support in a single chassis. Applications for asynchronous/synchronous support include: - Low speed WAN aggregation (up to 128 Kbps), |
| HWIC-4ESW | The HWIC-4ESW provides four switching ports. |
| HWIC-8A | New module included in CiscoPacket Tracer 6.0.1Cisco ISR routers. This serial modules allows out of band management of Cisco networking devices through their console port. The HWIC-8A module allows the connection of 8 console cables using the octal cable, each serial connection being mapped to a TCP port for telnet access. |
| WIC-Cover | The WIC cover plate provides protection for the internal electronic components. It also helps maintain adequate cooling by normalizing airflow. |
Network modules (NM)
Module | Description |
| NM-1E | The NM-1E features a single Ethernet port that can connect a LAN backbone which can also support either six PRI connections to aggregate ISDN lines, or 24 synchronous/asynchronous ports. |
| NM-1E2W | The NM-1E2W provides a single Ethernet port with two WIC slots that can support a single Ethernet LAN, together with two serial/ISDN backhaul lines, and still allow multiple serial or ISDN in the same chassis. |
| NM-1FE-FX | The NM-1FE-FX Module provides one Fast-Ethernet interface for use with fiber media. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. Single port network modules offer autosensing 10/100BaseTX or 100BaseFX Ethernet. |
| NM-1FE-TX | The NM-1FE-TX Module provides one Fast-Ethernet interface for use with copper media. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. Single port network modules offer autosensing 10/100BaseTX or 100BaseFX Ethernet. The TX (copper) version supports virtual LAN (VLAN) deployment. |
| NM-1FE2W | The NM-1FE2W Module provides one Fast-Ethernet interface for use with copper media, in addition to two Wan Interface Card expansion slots. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. Single port network modules offer autosensing 10/100BaseTX or 100BaseFX Ethernet. The TX (copper) version supports virtual LAN (VLAN) deployment. |
| NM-2E2W | The NM-2E2W provides two Ethernet ports with two WIC slots that can support two Ethernet LANs, together with two serial/ISDN backhaul lines, and still allow multiple serial or ISDN in the same chassis. |
| NM-2FE2W | The NM-2FE2W Module provides two Fast-Ethernet interfaces for use with copper media, in addition to two Wan Interface Card expansion slots. Ideal for a wide range of LAN applications, the Fast Ethernet network modules support many internetworking features and standards. |
NM-2W | The NM-2W Module provides two WAN Interface Card expansion slots. It can be used with a broad range of interface cards, supporting a diverse array of physical media and network protocols. |
| NM-4A/S | The 4-port asynchronous/synchronous serial network module provides flexible multi-protocol support, with each port individually configurable in synchronous or asynchronous mode, offering mixed-media dial support in a single chassis. Applications for Asynchronous/Synchronous support include: Low speed WAN aggregation (up to 128 Kbps), dial-up modem support, Async or Sync connections to management ports of other equipment, and transport of legacy protocols such as Bi-sync and SDLC. |
| NM-4E | The NM-4E features four Ethernet ports for multifunction solutions that require higher-density Ethernet than the mixed-media network modules. |
| NM-8A/S | The 8-port asynchronous/synchronous serial network module provides flexible multi-protocol support, with each port individually configurable in synchronous or asynchronous mode, offering mixed-media dial support in a single chassis. Applications for Asynchronous/Synchronous support include: Low speed WAN aggregation (up to 128 Kbps), dial-up modem support, Async or Sync connections to management ports of other equipment, and transport of legacy protocols such as Bi-sync and SDLC. |
| NM-8AM | The NM-8AM Integrated V.92 analog modem network module provides cost-effective analog telephone service connectivity for lower-density remote-access service (RAS), dial-out and fax-out modem access, asynchronous dial-on-demand routing (DDR) plus dial backup, and remote router management. Both the 8-port and 16-port versions use RJ-11 jacks to connect the integrated modems to basic analog telephone lines on the public switched telephone network (PSTN) or private telephony systems. |
| NM-Cover | The NM cover plate provides protection for the internal electronic components. It also helps maintain adequate cooling by normalizing airflow. |
