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For LED troubleshooting information, including possible trouble causes and corrective actions, see 
Ta b l e 6-1 in the “Troubleshooting” chapter.
Integrated 802.11a/b/g Radio Module (Wireless Models Only)
The Cisco 1800 series fixed-configuration routers with the wireless option have an integrated IEEE 
802.11a/b/g radio module that operates as a wireless access point in infrastructure mode. The wireless 
routers have two reverse-polarity threaded Neill-Concelman (RP-TNC) connectors on the back panel. The 
dipole swivel antennas that were shipped with the router connect to the RP-TNC connectors to operate the 
802.11a/b/g radio module.
CD2GreenThis LED indicates whether a connection is established (carrier detect). On the Cisco 1801, 
Cisco
 1802, and Cisco 1803 routers, this LED indicates whether a DSL connection is 
established. On the Cisco
 1811 router, this LED indicates whether a modem connection is 
established.
On indicates a connection is established.
Off indicates no connection established.
LPBK3GreenOn indicates the DSL interface is in loopback mode.
Off indicates DSL interface normal operation.
PPPGreenOn if at least one PPP connection is established.
VPNGreenOn if at least one VPN tunnel is established.
LINK4GreenOn indicates that an ISDN S/T connection has been established.
Off indicates that no ISDN S/T connection has been established.
B14GreenBlinking green indicates activity on the first B channel.
Off indicates no activity on the first B channel.
B24GreenBlinking green indicates activity on the second B channel.
Off indicates no activity on the second B channel.
SPD5GreenOn indicates a connection at high speed (V.90/V.92).
Off indicates a connection at low speed (V.32/V.32b/V.34). 
BUSY5GreenBlinking green indicates activity over the modem line.
Off indicates no activity.
CFGreenOn when CompactFlash memory is busy. Do not remove CompactFlash memory when this 
light is on.
1. Inline power is a field-upgradable option only. It is not installed by default.
2. This LED does not exist on the Cisco 1812.
3. This LED exists on the Cisco 1801, Cisco 1802, and Cisco 1803 only.
4. This LED does not exist on the Cisco 1811.
5. This LED exists on the Cisco 1811 only.
Table 1-3 Summary of LED Indicators on the Cisco 1800 Series Fixed-Configuration Routers (continued)
LED Color Description 
						

							 
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The wireless operations can be configured by using the Cisco Router and Security Device Manager 
(SDM) web-based application, or by using the Cisco IOS command-line interface (CLI). See the 
Cisco
 Router and Security Device Manager (SDM) Quick Start Guide or the Cisco Access Router 
Wireless Configuration Guide for more information.
Supported Cisco Radio Antennas (Wireless Models Only)
Ta b l e 1-4 lists the Cisco antennas that are supported on the Cisco 1800 series fixed-configuration 
wireless routers.
Chassis Ventilation
Cisco 1800 series fixed-configuration routers have an internal multispeed fan that provides chassis 
cooling, controlled by an onboard temperature sensor. The internal fan operates at a continuously 
variable speed to minimize fan noise while providing sufficient chassis cooling.
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 and 
to timestamp syslog messages. Cisco
 1800 series fixed-configuration routers have a socketed lithium 
battery. This battery lasts the life of the router under the operating environmental conditions specified 
for the router; the battery is not field-replaceable.
NoteIf the lithium battery in a Cisco 1800 series fixed-configuration router fails, the router must be returned 
to Cisco for repair.
Ta b l e 1-4 Cisco Antennas Supported on the Cisco 1800 Series Fixed-Configuration Wireless Routers 
Cisco Part NumberAntenna TypeMaximum GainDescription
AIR-ANTM2050D-ROmnidirectional2.0 dBi gain for 2.4GHz 
5.0 dBi for 5GHz
This is the default antenna. Swivel-mount dipole 
antenna operating in the 2.4- to 2.5-GHz band. 
This antenna is designed for use with Cisco 
wireless products utilizing an RP-TNC connector. 
For more information, see the
 Cisco Multiband 
Swivel-Mount Dipole Antenna document.
AIR-ANTM4050V-ROmnidirectional4.0 dBi gain for 2.4GHz 
5.0 dBi for 5GHz
Ceiling-mount antenna operating in the 2.4- to 
2.5-GHz band. This antenna has a clip that allows 
it to be mounted to a drop-ceiling cross member. 
For more information, see the
 Cisco Multiband 
Diversity Omnidirectional Ceiling-Mount 
Antenna document.
AIR-ANTM5560P-RPatch5.5 dBi gain for 2.4GHz 
6.0 dBi for 5GHz
Wall-mount antenna operating in the 2.4- to 
2.5-GHz band. For more information, see the 
Cisco Multiband Wall-Mount, Corner-Mount, or 
Mast-Mount Antenna document. 
						

							 
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  Chassis Views
Although the battery is not intended to be field-replaceable, the following warning must be heeded:
WarningThere 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
Kensington Lock
All Cisco 1800 series fixed-configuration routers include a Kensington lock located at the top left corner 
of the back panel for physical security.
Chassis Views
This section contains views of the front and rear panels of the Cisco 1800 series fixed-configuration 
routers, showing locations of the power and signal interfaces, module slots, status indicators, and chassis 
identification labels.
Figure 1-3Front Panel of Cisco 1801 Router 
Figure 1-4 Back Panel of Cisco 1801 Router
1CompactFlash Slot
127447
SYS OK  POE43FEX21FE0LINKB1
ISDNB2CF
876 SWITCH5COLPBKPPPVPN
Cisco 1800Series
DSL
1
1ADSL over POTS WAN port6POE connector1
2ISDN BRI S/T port7Power switch
127446
CISCO 1801
123456789
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Figure 1-5Front Panel of Cisco 1802 Router 
Figure 1-6 Back Panel of Cisco 1802 Router
3Managed 8-port FE switch8Power connector
4
FE WAN port2
9
RP-TNC antenna connectors (wireless models 
only)
5Console and AUX ports
1. Inline power is a field-upgradable option only. It is not installed by default.
2. The Cisco 1801 only has one FE WAN port, which is the lower of the two ports shown. The upper port is disabled, and 
reserved for a future purpose.
1CompactFlash Slot
127447
SYS OK  POE43FEX21FE0LINKB1
ISDNB2CF
876 SWITCH5COLPBKPPPVPN
Cisco 1800Series
DSL
1
1ADSL over ISDN WAN port6POE connector1
1. Inline power is a field-upgradable option only. It is not installed by default.
2ISDN BRI S/T port7Power switch
3Managed 8-port FE switch8Power connector
4
FE WAN port2
2. The Cisco 1802 only has one FE WAN port, which is the lower of the two ports shown. The upper port is disabled, and 
reserved for a future purpose.
9
RP-TNC antenna connectors (wireless models 
only)
5Console and AUX ports
127446
CISCO 1801
123456789
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Figure 1-7Front Panel of Cisco 1803 Router 
Figure 1-8 Back Panel of Cisco 1803 Router
Cisco 1811 Chassis
Figure 1-9 shows the front panel of a Cisco 1811 router. Figure 1-10 shows the rear panel of a 
Cisco 1811 router.
1CompactFlash Slot
127447
SYS OK  POE43FEX21FE0LINKB1
ISDNB2CF
876 SWITCH5COLPBKPPPVPN
Cisco 1800Series
DSL
1
1G.SHDSL WAN port6POE connector1
1. Inline power is a field-upgradable option only. It is not installed by default.
2ISDN BRI S/T port7Power switch
3Managed 8-port FE switch8Power connector
4
FE WAN port2
2. The Cisco 1803 only has one FE WAN port, which is the lower of the two ports shown. The upper port is disabled, and 
reserved for a future purpose.
9
RP-TNC antenna connectors (wireless models 
only)
5Console and AUX ports
127446
CISCO 1801
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Figure 1-9 Front Panel of Cisco 1811 Router 
Figure 1-10 Back Panel of Cisco 1811 Router
Cisco 1812 Chassis
Figure 1-11 shows the front panel of a Cisco 1812 router. Figure 1-12 shows the back panel of a 
Cisco 1812 router.
1CompactFlash Slot
SYS OK  POE54FEX32FE0CDSPD
V.92BUSYCF
987 SWITCH6FE1PPPVPN
Cisco 1800Series
127448
1
1V.92 Modem port6POE connector1
1. Inline power is a field-upgradable option only. It is not installed by default.
2USB 2.0 ports7Power switch
3Managed 8-port FE switch8Power connector
4
FE WAN ports
9
RP-TNC antenna connectors (wireless models 
only)
5Console and AUX ports
12745012345678
9
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  Interface Numbering
Figure 1-11 Front Panel of Cisco 1812 Router 
Figure 1-12 Back Panel of Cisco 1812 Router
Interface Numbering
The WAN and LAN interfaces on a Cisco 1800 series fixed-configuration router are numbered as 
follows:
 On the Cisco 1811 and Cisco 1812 routers, the Fast Ethernet 10/100 WAN ports are numbered FE 
0 and FE
 1; the lower of the two ports is FE 0.
 On the Cisco 1801, Cisco 1802, and Cisco 1803 routers, the Fast Ethernet 10/100 WAN port is 
numbered FE 0.
 On the Cisco 1811 and Cisco 1812 routers, the Fast Ethernet LAN switch ports are numbered FE 2 
through FE 9. The FE 2 port is the lower port, farthest on the right (as viewed from the rear of the 
router), and switch ports are numbered incrementally, FE 2 through FE 5, to the left along the 
bottom row, and then incrementally, FE
 6 through FE 9, to the left along the top row.
1CompactFlash Slot
SYS OK  POES4FEX32FE0LINKB1
ISDNB2CF
987 SWITCH6FE1PPPVPN
Cisco 1800Series
127167
1
1ISDN BRI S/T port6POE connector1
1. Inline power is a field-upgradable option only. It is not installed by default.
2USB 2.0 ports7Power switch
3Managed 8-port FE switch8Power connector
4
FE WAN ports
9
RP-TNC antenna connectors (wireless models 
only)
5Console and AUX ports
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 On the Cisco 1801, Cisco 1802, and Cisco 1803 routers, the Fast Ethernet LAN switch ports are 
numbered FE 1 through FE 8. The FE 1 port is the lower port, farthest on the right (as viewed from 
the rear of the router), and switch ports are numbered incrementally, FE 1 through FE 4, to the left 
along the bottom row, and then incrementally, FE
 5 through FE 8, to the left along the top row.
 The ADSL over POTS, ADSL over ISDN, G.SHDSL, ISDN S/T, and V.92 modem WAN ports are 
all numbered port 0 of their various type.
 On the Cisco 1811 and Cisco 1812 routers, the USB 2.0 ports are numbers usb 0 and usb 1. The 
usb
 0 port is the lower of the two ports and usb 1 is the upper port.
Specifications
Ta b l e 1-5 provides the specifications for Cisco 1800 series fixed-configuration routers.
Ta b l e 1-5 Specifications for Cisco 1800 Series Fixed-Configuration Routers 
DescriptionSpecification
Dimensions (W x D)12.5 x 9.5 in. (31.75 x 24.13 cm)
Height without rubber feet: 1.73 in. (4.39 cm)
Height with rubber feet: 1.87 in. (4.75 cm) 
WeightMaximum: 6.1 lb (2.8 kg)
AC input power
Input voltage
Frequency
Input current
Inrush surge current
74 W maximum
100 to 240 VAC
50 or 60 Hz
1.2 to 0.6 A
50 A maximum, one cycle (–48V power included)
Power dissipation (maximum)153 BTU/hr
Console and auxiliary portsRJ-45 connector
Operating humidity10 to 85% noncondensing operating; 5 to 95% noncondensing, 
nonoperating
Operating temperature32 to 104°F (0 to 40°C)
Nonoperating temperature–4 to 149°F (–20 to 65°C)
Noise level78°F/25.6°C through 104°F/40°C: 42 dBA 
Safety complianceUL 60950; CAN/CSA C22.2 No. 60950; IEC 60950-1; 
EN
 60950-1; AS/NZS 60950
For detailed compliance information, see the Regulatory 
Compliance and Safety Information for Cisco 1800 Integrated 
Services Routers (Fixed) document. 
						

							 
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Regulatory Compliance
For compliance information, see the Regulatory Compliance and Safety Information for Cisco 1800 
Integrated Services Routers (Fixed) document that accompanied the router shipment.
EMC Immunity complianceEN300386; EN55024(CISPR24); EN61000-4-2; EN61000-4-3; 
EN61000-4-4; EN61000-4-5; EN61000-4-6; EN61000-4-8; 
EN61000-4-11; EN55082-1; EN61000-6-2; ITU-T K.21 
For detailed compliance information, see the Regulatory 
Compliance and Safety Information for Cisco 1800 Integrated 
Services Routers (Fixed) document.
EMC Emissions complianceCFR 47 Part 15, Class A; ICES-003 Class A; EN55022 Class A; 
CISPR22 Class A; AS/NZS 3548 Class A; VCCI Class A; 
EN
 300386; EN61000-3-2; EN61000-3-3
For detailed compliance information, see the Regulatory 
Compliance and Safety Information for Cisco 1800 Integrated 
Services Routers (Fixed) document.
Table 1-5 Specifications for Cisco 1800 Series Fixed-Configuration Routers (continued)
Description Specification 
						

							 
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