Cisco C1121-4PLTEP User Manual

CHAPTER 5
ROM Monitor Overview
The ROMMON is the bootloader that initializes the hardware when the platform is powered on or reset. From
the ROMMON prompt, a Cisco IOS XE image can be manually booted. There is also an autoboot option to
boot a specified IOS XE image for every power-on or reset. When new features or significant defects are
resolved, a newer ROMMON release is available on CCO. To determine the current ROMMON version and
the location of the latest ROMMON release, these details are available in the following sections:
.
• ROM Monitor Overview, on page 85
ROM Monitor Overview
The ROM Monitor software is also known as ROMMON, boot software, boot image, or boot helper. Although
it is distributed with routers that use the Cisco IOS XE software, the ROMMON is a separate program from
the Cisco IOS XE software. During normal startup, ROMMON initializes the router, and then, the control
passes to the Cisco IOS XE software.
When you connect a terminal to the router that is in ROMMON mode, the ROMMON command-line interface
(CLI) prompt is displayed.
Access the ROMMON mode to perform these tasks:
• Specify config-register value to use for the next boot up
• Boot a valid IOS XE image
• Bypass NVRAM settings and config-register value for password recovery
After the Cisco IOS XE software boots up, ROMMON is no longer in use.
Note
Environmental Variables and the Configuration Register
Two primary connections exist between ROMMON and the Cisco IOS XE software: the ROMMON
environment variables and the configuration register.
Hardware Installation Guide for the Cisco 1000 Series Integrated Services Router
85

Cisco C1121-4PLTEP Specifications

General

DSL WAN	No
Ethernet WAN	Yes
Wi-Fi band	Dual-band (2.4 GHz / 5 GHz)
Wi-Fi standards	802.11a, 802.11b, 802.11g, Wi-Fi 5 (802.11ac)
Top Wi-Fi standard	Wi-Fi 5 (802.11ac)
WLAN data transfer rate (max)	1000 Mbit/s
Cabling technology	10/100/1000Base-T(X)
Networking standards	IEEE 802.11i, IEEE 802.11r, IEEE 802.1x
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
3G	-
USB version	3.2 Gen 1 (3.1 Gen 1)
Combo SFP ports quantity	1
Ethernet LAN (RJ-45) ports	5
Power over Ethernet (PoE) ports quantity	2
Security algorithms	3DES, 802.1x RADIUS, AES, DES
Flash memory	4096 MB
Internal memory type	DRAM
Product color	Silver
Output voltage	12 V
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (typical)	66 W
Operating altitude	0 - 3000 m
Storage temperature (T-T)	-20 - 65 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	5 - 95 %
Operating relative humidity (H-H)	10 - 85 %
Harmonized System (HS) code	85176990

Weight and Dimensions

Depth	226 mm
Width	322 mm
Height	41.9 mm
Weight	1560 g