Cisco 2821 - Integrated Services Router Unified Communications... Installation guide

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Overview of Cisco 2800 Series Routers
The Cisco 2800 series of integrated services routers offers secure, wire-speed delivery of concurrent
data, voice, and video services. The modular design of the Cisco 2800 series routers provides maximum
flexibility, allowing you to configure your router to meet evolving needs. The Cisco 2800 series routers
incorporate data, security, and voice services in a single system for fast, scalable delivery of crucial
business applications. The routers offer features such as hardware-based VPN encryption acceleration,
intrusion-protection and firewall functions, and optional integrated call processing and voice mail. The
routers offer a wide variety of network modules and interfaces, voice digital signal processor (DSP)
slots, high-density interfaces for a wide range of connectivity requirements, and sufficient performance
and slot density for future network expansion requirements and advanced applications.
The Cisco 2800 series consists of four versions. The Cisco 2801 routers and Cisco 2811 routers are one
rack unit in height and have two 10/100 LAN ports. The more powerful Cisco 2821 routers and
Cisco 2851 routers are two rack units in height and have two 10/100/1000 LAN ports. The higher-end
router platforms of the Cisco 2800 series offer increased performance, increased slot density including
network module slots ad extension voice module slots and increased inline power output.
Figure 1, Figure 2, and Figure 3 show front views of the Cisco 2800 series routers.
Figure 1 Front View of a Cisco 2801 Router
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Hardware Features
Figure 2 Front View of a Cisco 2811 Router
Figure 3 Front View of a Cisco 2821 or Cisco 2851 Router
This chapter describes the features and specifications of the routers and includes the following sections:
•Hardware Features, page 2
•Chassis Views, page 11
•Interface Numbering, page 16
•Specifications, page 18
•Regulatory Compliance, page 25
Hardware Features
This section describes the basic features of Cisco 2800 series routers, including product identification,
built-in interfaces, modules, memory, LED indicators, chassis ventilation, and the internal clock.
Product Serial Number Location
The serial number label for Cisco 2801 routers is located on the rear of the chassis, along the bottom
edge near the lower left corner. (See Figure 4.)
95902
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COMPACT FLASH
CONSOLE OPTIONAL RPS INPUT
12V 11A
AUX
SYS
PWR
AUX/
PWR
SYS
ACT CF
-48V 4A
100-240 V~ 4A
50/60 Hz
0
1
95903
Do Not Remove During Network Operation
COMPACT FLASH
CONSOLE
AUX
SYS
PWR
AUX/
PWR
SYS
ACT CF
0
1
OPTIONALRPSINPUT
12V11A
-48V4A
100-240 V~ 4A
50/60 Hz

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Hardware Features
Figure 4 Serial Number Location on the Cisco 2801 Router
Note The serial number for Cisco 2801 routers is 11 characters long.
The serial number label for Cisco 2811 routers is located on the rear of the chassis, near the top right
corner, to the left of the CLEI label. (See Figure 5.)
Figure 5 Serial Number Location on the Cisco 2811 Router
Note The serial number for Cisco 2811 routers is 11 characters long.
117342 781-00286-01
SN: AAANNNNXXXX
SN: AAANNNNXXXX
103962 781-00287-01
A=ACT
FE0/1
PVDM1PVDM0AIM1AIM0
FE0/0
S=SPEED
A=FDX
A=LINK
A
F
S
L
A
F
S
L
S
L
O
T
2
S
L
O
T
0
S
L
O
T
3
S
L
O
T
1
ENM0
SN: AAANNNNXXXX

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Hardware Features
The serial number label for Cisco 2821 and Cisco 2851 routers is located on the rear of the chassis, near
the top right corner, below the CLEI label. (See Figure 6.)
Figure 6 Serial Number Location on the Cisco 2821 and Cisco 2851 Routers
Note The serial number for Cisco 2821 and Cisco 2851 routers is 11 characters long.
Cisco Product Identification Tool
The Cisco Product Identification (CPI) tool provides detailed illustrations and descriptions showing
where to locate serial number labels on Cisco products. It includes the following features:
•A search option that allows browsing for models using a tree-structured product hierarchy
•A search field on the final results page making it easier to look up multiple products
•End-of-sale products are clearly identified in results lists
The tool streamlines the process of locating serial number labels and identifying products. Serial number
information expedites the entitlement process and is important for access to support services.
The Cisco Product Identification tool can be accessed at the following URL:
http://tools.cisco.com/Support/CPI/index.do
Built-in Interfaces
Table 1 summarizes the interface ports built into the chassis.
103963 781-00288-01
A= ACT
FE 0/1
PVDM2 PVDM1 PVDM0 AIM1 AIM0
FE 0/0
S= SPEED
A= FDX
A= LINK
A
F
S
L
A
F
S
L
SN: AAANNNNXXXX
SN: AAANNNNXXXX
Table 1 Summary of Cisco 2800 Series Built-In Interfaces
Model
100BASE-T Fast Ethernet (FE)
Ports (RJ-45)
1000BASE-T Gigabit
Ethernet (GE) Ports (RJ-45)
Universal Serial
Bus (USB) Ports
Console Port
(RJ-45)
Auxiliary Port
(RJ-45)
Cisco 2801 2 — 1 1 1
Cisco 2811 2 — 2 1 1
Cisco 2821 — 2 2 1 1
Cisco 2851 — 2 2 1 1

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Hardware Features
Removable and Interchangeable Modules
Table 2 summarizes the optional modules that can be installed in the router to provide specific
capabilities. The network modules, extension voice modules, and interface cards fit into slots, located
on the front of the chassis on the Cisco 2801 router, and on the rear of the chassis on the Cisco 2811,
Cisco 2821, and Cisco 2851 routers; they can be removed and installed without opening the chassis.
Advanced integration modules (AIMs), expansion DRAM memory modules (DIMMs), and packet voice
data modules (PVDMs) plug into connectors inside the chassis; they can be removed and installed only
by opening the chassis.
Table 2 Summary of Cisco 2800 Series Removable and Interchangeable Modules
Router Model
External Modules (In chassis slots) Internal Modules
Network Modules High-Speed WAN
Interface Cards (HWICs)
ExtensionVoice
Modules
(EVMs)
Advanced
Integration
Modules (AIMs)
Packet Voice
Data Modules
(PVDMs)1
1. Cisco 2800 series routers use PVDM II modules that are not compatible with Cisco 2600 series routers.
Cisco 2801 — 2 single-wide (HWIC) or
2 double-wide (HWIC-D)
1 WIC/VWIC/VIC slot
1 VWIC/VIC (voice-only)
—22
Cisco 2811 1 network module (NM) or
1 network module enhanced
(NME)
4 single-wide (HWIC) or
2 double-wide (HWIC-D)
—22
Cisco 2821 1 network module (NM) or
1 network module enhanced
(NME) or
1 network module enhanced
extended (NME-X)
4 single-wide (HWIC) or
2 double-wide (HWIC-D)
123
Cisco 2851 1 network module (NM) or
1 network module enhanced
(NME) or
1 network module enhanced
extended (NME-X) or
1 network module
double-wide (NMD) or
1 network module enhanced
extended double-wide
(NME-XD)
4 single-wide (HWIC) or
2 double-wide (HWIC-D)
123

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Hardware Features
Memory
Cisco 2800 series routers contain the following types of memory:
•DRAM—Stores the running configuration and routing tables and is used for packet buffering by the
network interfaces. Cisco IOS software executes from DRAM memory.
•Boot/NVRAM—Internal flash memory. Stores the bootstrap program (ROM monitor), the
configuration register, and the startup configuration.
•Flash memory—External flash memory. Stores the operating system software image.
Table 3 summarizes the memory options for Cisco 2800 series routers. The default memory numbers for
RAM represent the minimum usable memory. You can install additional RAM in multiples of the default
amount, up to the maximum amount.
Table 3 Router Memory Specifications
Router
Platform DRAM Boot/NVRAM Flash Memory
Cisco 2801 Type—SDRAM DIMM
DIMM sizes—64 MB, 128 MB, 256 MB
DIMM expansion slots—11
Default onboard memory—128 MB
Maximum memory—384 MB
1. Cisco 2801 routers have 128 MB of SDRAM soldered onto the system board. You can install a DIMM into the expansion slot
to increase memory to the maximum of 384 MB.
Internal 4-MB
flash memory
External CompactFlash
memory cards of the
following optional
sizes:
•64 MB (default)
•128 MB
Cisco 2811 Type—ECC DDR (error-correcting code,
double data rate) SDRAM DIMM
DIMM sizes—256 MB, 512 MB
DIMM slots—2
Default onboard memory— none
Default memory—256 MB
Maximum memory—768 MB2
2. Cisco 2811 routers can accept one 256 MB and one 512 MB DIMM to provide 768 MB of usable memory.
Internal 2-MB
flash memory
External CompactFlash
memory cards of the
following optional
sizes:
•64 MB (default)
•128 MB
•256 MB
Cisco 2821 Type—ECC DDR (error-correcting code,
double data rate) DRAM DIMM
DIMM sizes—256 MB, 512 MB
DIMM slots—2
Default onboard memory— none
Default memory—256 MB
Maximum memory—1024 MB3
3. Cisco 2851 routers can accept two 512 MB DIMMs to provide 1024 MB of usable memory.
Cisco 2851

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Hardware Features
Power
Table 4 summarizes the power options for Cisco 2800 series routers. Cisco 2801 routers are equipped
for operation using AC power only. Cisco 2811, Cisco 2821, and Cisco 2851 routers can be equipped for
operation using either AC or DC input power by installation of the appropriate chassis power supply. IP
phone power is supported if the appropriate AC-input chassis power supply is installed.
LED Indicators
Table 5 and Table 6 summarize the LED indicators that are located in the router bezel or chassis, but not
in removable modules or interface cards.
Table 4 Summary of Cisco 2800 Series Power Options
Router Model Power Option Input IP Phone Power Output
Cisco 2801 AC input without IP phone power
output
100 - 240 VAC, 2 A None
AC input with IP phone power
output
100 - 240 VAC, 5 A –48 VDC, 120 W
Cisco 2811 AC input without IP phone power
output
100 - 240 VAC, 2 A None
AC input with IP phone power
output
100 - 240 VAC, 4 A –48 VDC, 160 W
DC input without IP phone power
output
24 - 60 VDC, 8 A None
Cisco 2821 AC input without IP phone power
output
100 - 240 VAC, 3 A None
AC input with IP phone power
output
100 - 240 VAC, 8 A –48 VDC, 240 W
DC input without IP phone power
output
24 - 60 VDC, 12 A None
Cisco 2851 AC input without IP phone power
output
100 - 240 VAC, 3 A None
AC input with IP phone power
output
100 - 240 VAC, 8 A –48 VDC, 360 W
DC input without IP phone power
output
24 - 60 VDC, 12 A None
Cisco 2811,
Cisco 2821, and
Cisco 2851
Backup power for AC- or
DC-powered routers:
Cisco Redundant Power System
(RPS-675)
100 VAC, 10 A,
or 240 VAC, 6 A
The Cisco RPS provides IP phone power
only if the chassis power supply supports
IP phone power.
With Cisco 2811: –48 VDC, 160 W
With Cisco 2821: –48 VDC, 240 W
With Cisco 2851: –48 VDC, 360 W

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Hardware Features
To see descriptions of LEDs in removable modules and interface cards, refer to the applicable
documentation for those products: the Cisco Network Modules Hardware Installation Guide or the Cisco
Interface Cards Installation Guide.
For LED troubleshooting information, including possible trouble causes and corrective actions, see
Table 1 in the “Troubleshooting Cisco 2800 Series Routers” document.
Table 5 Summary of Cisco 2801 Series LED Indicators
LED Color Description Location
SYS PWR Green Router has successfully booted up and the
software is functional. This LED blinks while
booting or in the ROM monitor.
Front
SYS ACT Green Blinking when any packets are transmitted or received
on any WAN or LAN or system is monitoring internal
activities.
Front
CF Green On when flash memory is busy. Do not
remove the CompactFlash memory card when this
light is on.
Front
AUX/PWR Green/
Amber
Indicates that the inline power supply is present
(LED is on). When the inline power supply is not
installed, the LED is off. If the power supply is
working properly, the LED is green. If the
power supply is not working properly, the LED
is amber, indicating an inline power failure.
Front
FE 0 Link Green On when the router is correctly connected to a
local Ethernet LAN through Ethernet port 0.
Front
FE 0 100 Green On indicates a 100-Mbps link.
Off indicates a 10-Mbps link.
Front
FE 0 FDX Green On indicates full-duplex operation.
Off indicates half-duplex operation.
Front
FE 1 Link Green On when the router is correctly connected to a
local Ethernet LAN through Ethernet port 1.
Front
FE 1 100 Green On indicates a 100-Mbps link.
Off indicates a 10-Mbps link.
Front
FE 1 FDX Green On indicates full-duplex operation.
Off indicates half-duplex operation.
Front
AIM 0 Green On indicates presence of an advanced integration
module (AIM) in AIM slot 0.
Front
AIM 1 Green On indicates presence of an AIM in AIM slot 1. Front
PVDM 0 Green On indicates presence of a packet voice data
module (PVDM) in PVDM slot 0.
Front
PVDM 1 Green On indicates presence of a PVDM in PVDM slot 1. Front

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Table 6 Summary of Cisco 2811, Cisco 2821, and Cisco 2851 Series LED Indicators
LED Location LED Label
LED Color or
State Meaning
Front of chassis SYS
PWR
Solid green System is operating normally
Blinking green System is booting or is in ROM monitor mode
Amber System error
Off Power is off or system board is faulty
AUX/
PWR
Green IP phone power operating normally (if installed), or
Cisco Redundant Power System (RPS) operating normally (if
installed)
Amber IP phone power fault (if installed), or
Cisco Redundant Power System (RPS) fault (if installed)
Off IP phone power and Cisco RPS are not installed
SYS
ACT
Blinking green
or solid green
Packet transfers are occurring
Off No packet transfers are occurring
CF Green Flash memory is being accessed; do not eject the CompactFlash
memory card
Off Flash memory is not being accessed; okay to eject the CompactFlash
memory card
Rear of chassis A (=ACT) Blinking green
or solid green
Packet activity in FE or GE port
Off No packet activity in FE or GE port
F (=FDX) Green FE or GE port is operating in full-duplex mode
Off FE or GE port is operating in half-duplex mode
S (= Speed)1
1. The Ethernet S (Speed) LED blinks only when the L (Link) LED is on.
1 blink + pause FE or GE port operating at 10 Mbps
2 blinks + pause FE or GE port operating at 100 Mbps
3 blinks + pause GE port operating at 1000 Mbps (Cisco 2821 and Cisco 2851 only)
L (= Link) Green FE or GE link is established
Off No FE or GE link is established
PVDM0
PVDM1
PVDM22
2. The PVDM2 LED is applicable only to the Cisco 2821 and Cisco 2851 routers.
Green PVDM in slot (0, 1, or 2) is initialized
Amber PVDM in slot (0, 1, or 2) is detected but not initialized
Off No PVDM installed in slot (0, 1, or 2)
AIM0
AIM1
Green AIM in slot (0 or 1) is initialized
Amber AIM in slot (0 or 1) has initialization error
Off No AIM installed in slot (0 or 1)

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Hardware Features
Chassis Ventilation
Internal multispeed fans provide chassis cooling, controlled by an onboard temperature sensor.
The Cisco 2801 router has two fans. The Cisco 2801 router with inline power includes two additional
fans integrated with the inline power supply, for a total of four fans. The Cisco 2801 internal fans operate
at three different speeds, running at the slower speeds to conserve power and reduce fan noise at ambient
temperatures below 40oC. They operate at the highest speed in ambient temperatures above 40oC.
The Cisco 2811 router has three fans that operate at a slower speed to conserve power and reduce fan
noise at ambient temperatures below 32oC. They operate at high speed in ambient temperatures above
32oC.
The Cisco 2821 and Cisco 2851 routers have three fans that operate at a slower speed to conserve power
and reduce fan noise at ambient temperatures below 40oC. They operate at high speed in ambient
temperatures above 40oC.
Caution Ensure the device is not installed in close proximity to other devices which could lead to excessive
pre-heating of air at the air intake of the router.
Caution Your chassis installation must allow unrestricted airflow for chassis cooling.
Cisco 2800 Series Router Installation and Preventive Maintenance
Periodic inspection and cleaning of the external surface of the router is recommended to minimize the
negative impact of environmental dust or debris on the router performance. The frequency of inspection
and cleaning is dependent upon the severity of the environmental conditions. Cleaning involves
vacuuming of router air intake and exhaust vents.
Caution Fans are dynamic Electro-Mechanical devices. As such, fans can fail for various electronic reasons, and
will eventually fail due to mechanical wear-out. Sites with ambient temperatures consistently above 25
degree C and with potentially high levels of dust or debris may require fan servicing.
Real-Time Clock
An internal real-time clock with battery backup provides the system software with time of day on system
power up. This allows the system to verify the validity of the certification authority (CA) certificate. In
the Cisco 2811, Cisco 2821, and Cisco 2851 routers, the clock and battery are permanently installed; the
battery lasts the life of the router under the operating environmental conditions specified for the router.
The Cisco 2801 router has a socketed lithium battery. This battery lasts the life of the router under the
operating environmental conditions specified for the router, and is not field-replaceable.
Note If the lithium battery in a Cisco 2801 router should fail, the router must be returned to Cisco for repair.
Although the battery is not intended to be field-replaceable, the following warning must be heeded:

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Chassis Views
Warning There is the danger of explosion if the battery is replaced incorrectly. Replace the battery only with
the same or equivalent type recommended by the manufacturer. Dispose of used batteries according
to the manufacturer’s instructions. Statement 1015
Chassis Views
This section contains views of the front and rear panels of the Cisco 2800 series routers, showing
locations of the power and signal interfaces, module slots, status indicators, and chassis identification
labels.
Cisco 2801 Chassis
Figure 7 shows the front panel of a Cisco 2801 router. Figure 8 shows the back panel.
Figure 7 Front Panel of the Cisco 2801 Router
Double-wide HWICs can go into slots 0 and 1, and into slots 2 and 3.
Note Slot 0 does not support PRI on T1/E1 VWICs, only channel-associated signaling (CAS) digital voice.
1Slot 0 (VIC or VWIC, for voice only) 8Auxiliary Power (AUX/PWR) LED
2Slot 1 (WIC, VIC, VWIC, or HWIC) 9Universal serial bus (USB) port
3Slot 2 (WIC, VIC, or VWIC) 10 AIM/PVDM LEDs
4Slot 3 (WIC, VIC, VWIC, or HWIC) 11 Auxiliary port
5Console port 12 Compact flash (CF) LED
6Fast Ethernet ports and LEDs 13 External CompactFlash memory card slot
7System LEDs 14 Removable center card guides to allow
double-wide HWIC-D installation
95816
1234
5
6
7 9 11 12 13 14 14
8 10

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Chassis Views
Figure 8 Back Panel of the Cisco 2801 Router
Cisco 2811 Chassis
Figure 9, Figure 10, and Figure 11 show the front panel of a Cisco 2811 router. Figure 12 shows the rear
panel of a Cisco 2811 router.
Figure 9 Front Panel of Cisco 2811 Router with AC Input Power and Without IP Phone Power Output
Figure 10 Front Panel of Cisco 2811 Router with AC Input Power and with IP Phone Power Output
1Input power connector 3Chassis ground connection
2On/Off switch
95905
31
2
1Input power connection 5Universal serial bus (USB) ports
2On/Off switch 6External CompactFlash memory card slot
3Cisco redundant power supply connector (covered if not used) 7LED indicators
4Console and auxiliary ports
1Input power connection 5Universal serial bus (USB) ports
2On/Off switch 6External CompactFlash memory card slot
3Cisco redundant power supply connector (covered if not used) 7LED indicators
4Console and auxiliary ports
95551
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COMPACT FLASH
CONSOLE
0
1
OPTIONAL RPS INPUT
12V 11A
AUX
SYS
PWR
AUX/
PWR
SYS
ACT CF 100-240 V~ 2A
50/60 Hz
124567 3
95550
CONSOLE OPTIONAL RPS INPUT
12V 11A
AUX
SYS
PWR
AUX/
PWR
SYS
ACT CF
-48V 4A
124567 3
0
1
100-240V~ 8A
50/60 Hz
Do Not Remove During Network Operation
COMPACT FLASH

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Chassis Views
Figure 11 Front Panel of Cisco 2811 Router with DC Input Power
Figure 12 Rear Panel of Cisco 2811 Router
1Input power connection 5Universal serial bus (USB) ports
2On/Stand-by switch1
1. This switch does not turn off the power supply completely, but rather puts it in stand-by mode.
6External CompactFlash memory card slot
3Cisco redundant power supply connector (covered if not used) 7LED indicators
4Console and auxiliary ports
1Screw holes for ground lug 5High-speed WAN interface card slot 1
2Fast Ethernet port 0/0 6High-speed WAN interface card slot 2
3Fast Ethernet port 0/1 7High-speed WAN interface card slot 3
4High-speed WAN interface card slot 0 8Network module enhanced (NME) slot1
1. The network module slot is compatible with Cisco network modules of type NM (network module) and NME (network module enhanced).
95552
Do Not Remove During Network Operation
COMPACT FLASH
CONSOLE
0
1
OPTIONAL RPS INPUT
12V 11A
AUX
SYS
PWR
AUX/
PWR
SYS
ACT CF
4567 3
24-60 V 8A
12
A= ACT
FE 0/1
PVDM1 PVDM0 AIM1 AIM0
FE 0/0
S= SPEED
A= FDX
A= LINK
A
F
S
L
A
F
S
L
H
W
I
C
2
H
W
I
C
0
H
W
I
C
3
H
W
I
C
1
1
23
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Chassis Views
Cisco 2821 and Cisco 2851 Chassis
Figure 13, Figure 14, and Figure 15 show the front panel of Cisco 2821 and Cisco 2851 routers.
Figure 16 shows the rear panel of a Cisco 2821 router. Figure 17 shows the rear panel of a Cisco 2851
router.
Figure 13 Front Panel of Cisco 2821 and Cisco 2851 Routers with AC Input Power and Without IP Phone Power Output
Figure 14 Front Panel of Cisco 2821 and Cisco 2851 Routers with AC Input Power and IP Phone Power Output
1Input power connection 5External CompactFlash memory card slot
2On/Off switch 6LED indicators
3Console and auxiliary ports 7Cisco redundant power supply connector (covered if not used)
4Universal serial bus (USB) ports
1Input power connection 5External CompactFlash memory card slot
2On/Off switch 6LED indicators
3Console and auxiliary ports 7Cisco redundant power supply connector (covered if not used)
4Universal serial bus (USB) ports
95553
Do Not Remove During Network Operation
COMPACT FLASH
0
1
OPTIONAL RPS INPUT
SYS
PWR
AUX/
PWR
SYS
ACT CF
12V 18A
100-240 V~ 3A
50/60 Hz
1457 6 3
CONSOLE
AUX
2
95554
Do Not Remove During Network Operation
COMPACT FLASH
0
1
OPTIONAL RPS INPUT
SYS
PWR
AUX/
PWR
SYS
ACT CF
12V 18A
-48V 8A
1457 6 3
CONSOLE
AUX
2
100-240V~ 8A
50/60 Hz

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Chassis Views
Figure 15 Front Panel of Cisco 2821 and Cisco 2851 Routers with DC Input Power
Figure 16 Rear Panel of the Cisco 2821 Router
1Input power connection 5External CompactFlash memory card slot
2On/Standby switch1
1. This switch does not turn off the power supply completely, but rather puts it in standby mode.
6LED indicators
3Console and auxiliary ports 7Cisco redundant power supply connector (covered if not used)
4Universal serial bus (USB) ports
1Gigabit Ethernet port 0/0 6High-speed WAN interface card slot 3
2Gigabit Ethernet port 0/1 7Extension voice module (EVM) slot
3High-speed WAN interface card slot 0 8Network module enhanced (NME) slot1
1. The network module slot is compatible with Cisco network modules of type NM (network module), NME (network module enhanced), and NME-X
(enhanced extended).
4High-speed WAN interface card slot 1 9Screw holes for ground lug
5High-speed WAN interface card slot 2
95555
Do Not Remove During Network Operation
COMPACT FLASH 0
__
++
AB
1
OPTIONAL RPS INPUT
SYS
PWR
AUX/
PWR
SYS
ACT CF
12V 18A
457 6 3
CONSOLE
AUX
24-60V 12A
12
95572
12 6 4 3 75
9
A= ACT
GE 0/1
PVDM2 PVDM1 PVDM0 AIM1 AIM0
GE 0/0
S= SPEED
A= FDX
A= LINK
A
F
S
L
A
F
S
LEVM 2 ONLY
1
8

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Interface Numbering
Figure 17 Rear Panel of the Cisco 2851 Router
Interface Numbering
Table 7 summarizes the interface numbering on a Cisco 2801 series router. Table 8 summarizes the
interface numbering on Cisco 2811, Cisco 2821, and Cisco 2851 series routers.
Note The interface numbering on Cisco 2800 series routers is different from the numbering on Cisco 2600
series routers.
Note On the Cisco 2801 router, the numbering format for slots is interface type 0/slot/port. “0” indicates slots
that are built into the chassis of a router. On the Cisco 2801 router, all slots begin with “0,” because all
slots are built into the chassis. Note that this is different from the Cisco 2811, Cisco 2821, and
Cisco 2851 routers. On these routers, some slots are built into the chassis and have slot numbers that
begin with “0”. However, it is possible to have other slots that are part of a network module or an
extension voice module. Those slots have slot numbers that begin with “1” or “2,” respectively.
1Gigabit Ethernet port 0/0 6High-speed WAN interface card slot 3
2Gigabit Ethernet port 0/1 7Extension voice module (EVM) slot
3High-speed WAN interface card slot 0 8Network module enhanced (NME) slot1
1. The network module slot is compatible with Cisco network modules of type NM (network module), NME (network module enhanced), NME-X
(enhanced extended), NMD (double-wide), and NME-XD (enhanced extended double-wide).
4High-speed WAN interface card slot 1 9Screw holes for ground lug
5High-speed WAN interface card slot 2
EVM 2 ONLY
A= ACT
GE 0/1
PVDM2 PVDM1 PVDM0 AIM1 AIM0
GE 0/0
S= SPEED
A= FDX
A= LINK
A
F
S
L
A
F
S
L
H
W
I
C
2
H
W
I
C
0
H
W
I
C
3
H
W
I
C
1
1
95557
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5
461
2
9
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Overview of Cisco 2800 Series Routers
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Interface Numbering
Note On the Cisco 2801 router, the numbering format for configuring an asynchronous interface is 0/slot/port.
To configure the line associated with an asynchronous interface, simply use the interface number to
specify the async line. For example, line 0/1/0 specifies the line associated with interface serial 0/1/0 on
a WIC-2A/S in slot 1. Similarly, line 0/2/1 specifies the line associated with interface async 0/2/1 on a
WIC-2AM in slot 2.
Table 7 Interface Numbering on Cisco 2801 Series Routers
Slot Number Slot Type Interface Numbering Range
Onboard ports Fast Ethernet 0/0 and 0/1
0 VIC / VWIC (voice only) 0/0/0 to 0/0/3
1 HWIC / WIC / VIC / VWIC1
1. A VWIC in slots 1, 2, and 3 can operate in both data and voice mode; in slot 0, a VWIC can operate only in voice
mode.
0/1/0 to 0/1/3 (single-wide HWIC)
0/1/0 to 0/1/7 (double-wide HWIC)
2 WIC / VIC / VWIC10/2/0 to 0/2/3
3 HWIC / WIC / VIC / VWIC10/3/0 to 0/3/3 (single-wide HWIC)
0/3/0 to 0/3/7 (double-wide HWIC)
Table 8 Interface Numbering on Cisco 2811, Cisco 2821, and Cisco 2851 Integrated Services Routers
Port Location Interface Numbering Scheme Examples1,2
Built into the chassis front panel Interface-type port usb 0
usb 1
Built into the chassis rear panel Interface-type 0/ port interface fa 0/x
interface gi 0/x
In an interface card (HWIC,
HWIC-D, WIC, VWIC, VIC)
plugged directly into an HWIC
slot in a chassis
Interface-type 0/ interface-card-slot3/ port
Note Interface card slots built into the chassis are labeled
HWIC slot-number on Cisco 2800 series routers.
interface serial 0/x/y
interface async 0/x/y
line 0/x/y4
interface fa 0/x/y
voice-port 0/x/y
In an interface card (WIC,
VWIC, VIC) plugged into a slot
in a network module
Interface-type 15/ interface-card-slot / port controller t1 1/x/y
voice-port 1/x/y
interface serial 1/x/y
interface async 1/x/y
line 1/x/y4
Built into a network module
(NME, NME-X, NMD,
NME-XD)
Interface-type 15/ port interface gi 1/x
interface serial 1/x
interface async 1/x
line 1/x4
FXS or FXO port in an extension
voice module (EVM)
Interface-type 26/ 07/ port
FXS/DID port numbers 0 to 7 are built into the EVM.
FXS/FXO port numbers 8 to 15 are in expansion module 0.
FXS/FXO port numbers 16 to 23 are in expansion module 1.
voice-port 2/0/x

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Specifications
Note On the Cisco 2811, Cisco 2821, and Cisco 2851 routers, the interface numbering scheme is the same for
asynchronous interfaces as other types of interfaces. To configure the line associated with an async
interface, simply use the interface number to specify the async line. For example, line 0/3/0 specifies the
line associated with interface serial 0/3/0 on a WIC-2A/S in slot 3. Similarly, line 1/22 specifies the line
associated with interface async 1/22 on a NM-32A in network module slot 1.
Specifications
Table 9, Table 10, Table 11, and Table 12 list Cisco 2800 series specifications.
Voice port in a BRI expansion
module (internal slot) in an
extension voice module (EVM)
Interface-type 26/ 07/ port
Port numbers are 8 to 11 in expansion module 0.
Port numbers are 16 to 19 in expansion module 1.
voice-port 2/0/x
BRI interface in a BRI expansion
module (internal slot) in an
extension voice module (EVM)
Interface-type 26/ port
Port numbers are 0 to 3 if one expansion module is installed.
Port numbers are 0 to 7 if two expansion modules are installed.
interface bri 2/x
1. Interface abbreviations: fa = Fast Ethernet; gi = Gigabit Ethernet; usb = universal serial bus; bri = ISDN basic rate interface.
2. The interfaces listed are examples only; other possible interface types are not listed.
3. Interface card slot numbers for double-width (HWIC-D) slots are 1 and 3 only.
4. Specify the line number in the Cisco IOS CLI by using the interface number for the associated asynchronous serial interface.
5. “1” is the network module slot number in all Cisco 2800 series routers.
6. “2” is the EVM slot number in Cisco 2821 and Cisco 2851 routers.
7. “0” is required by the CLI syntax for voice ports in an EVM; it indicates no interface card slots in EVMs.
Table 8 Interface Numbering on Cisco 2811, Cisco 2821, and Cisco 2851 Integrated Services Routers (continued)
Port Location Interface Numbering Scheme Examples1,2
Table 9 Cisco 2801 Router Specifications
Description Specification
Dimensions (H x W x D) 1.72 x 17.49 x 16.5 in. (4.4 x 44.4 x 41.9 cm).
Weight 10.9 lb (4.9 kg) with standard power supply if fully populated with
modules
13.71 lb (6.2 kg) with inline power supply if fully populated with
modules
AC input power
•Input voltage
•Frequency
•Input current
•Inrush surge current
100 to 240 VAC, autoranging
47 to 63 Hz
2 A (5 A for IP phone support)
50 A maximum, one cycle (–48V power included)
Power consumption 105 W with standard power supply (maximum)
130 W with inline power supply and 12 IP phones (maximum)
Console and auxiliary ports RJ-45 connector

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Specifications
Operating humidity 5 to 95%, noncondensing
Operating temperature 32 to 104°F (0 to 40°C)
Nonoperating temperature –4 to 149°F (–20 to 65°C)
Noise level, standard power
supply
39 dBA for local temperatures < 90°F (32°C)
47 dBA for local temperatures between 90°F and 116°F (47°F)
52.6 dBA for temperatures above 116°F (47°F)
Noise level, inline power supply 44 dBA for local temperatures < 90°F (32°C)
50 dBA for local temperatures between 90°F and 116°F (47°F)
53 dBA for temperatures above 116°F (47°F)
Safety compliance UL 60950; CAN/CSA C22.2 No. 60950-00; IEC 60950;
EN 60950-1; AS/NZS 60950
For detailed compliance information, refer to the Cisco 2800 and
Cisco 3800 Series Integrated Services Routers Regulatory
Compliance and Safety Information document.
Immunity compliance EN300386; EN55024/CISPR24; EN50082-1; EN61000-6-2
For detailed compliance information, refer to the Cisco 2800 and
Cisco 3800 Series Integrated Services Routers Regulatory
Compliance and Safety Information document.
EMC compliance FCC Part 15; ICES-003 Class A; EN55022 Class A;
CISPR22 Class A; AS/NZS 3548 Class A; VCCI Class A;
EN 300386; EN61000-3-3; EN61000-3-2
For detailed compliance information, refer to the Cisco 2800 and
Cisco 3800 Series Integrated Services Routers Regulatory
Compliance and Safety Information document.
Table 9 Cisco 2801 Router Specifications (continued)
Description Specification

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Specifications
Table 10 Cisco 2811 Router Specifications
Description Specification
Dimensions (H x W x D) 1.75 x 17.25 x 16.4 in. (44.5 x438.2 x 416.6 mm), 1 RU height
Weight 14 lb (6.36 kg) if fully populated with modules
AC input power
•Input voltage
•Frequency
•Input current
•Inrush surge current
100 to 240 VAC, autoranging
47 to 63 Hz
2 A (4 A for IP phone support)
50 A maximum, one cycle (–48V power included)
DC input power
•Input voltage
•Input current
•Inrush surge current
24 to 60 VDC, positive or negative
8 A at 24 V
50 A, maximum, <10 ms
Power dissipation
(maximum)
•AC without
IP phone support
•AC with
IP phone support:
System only
IP phones
DC
170 W (580 BTU/hr)
210 W (717 BTU/hr)
160 W (546 BTU/hr)
180 W (614 BTU/hr)
Console and auxiliary ports RJ-45 connector
Operating humidity 5 to 95%, noncondensing
Operating temperature 32 to 104°F (0 to 40°C)
Nonoperating temperature –4 to 149°F (–20 to 65°C)
Noise level 47 dBA in normal ambient temperature;
57 dBA in maximum ambient temperature
Safety compliance UL 60950; CAN/CSA C22.2 No. 60950-00; IEC 60950;
EN 60950-1; AS/NZS 60950
For detailed compliance information, refer to the Cisco 2800 and
Cisco 3800 Series Integrated Services Routers Regulatory
Compliance and Safety Information document.
Immunity compliance EN300386; EN55024/CISPR24; EN50082-1; EN61000-6-2
For detailed compliance information, refer to the Cisco 2800 and
Cisco 3800 Series Integrated Services Routers Regulatory
Compliance and Safety Information document.