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Cisco Interface Cards for Cisco Access

Routers
Introduction to Cisco Interface Cards
Cisco interface cards are classified according to the technologies they support. For
example, WAN interface cards (WICs) support WAN technologies, such as Gigabit
Ethernet; and voice interface cards (VICs) support voice technologies. Voice/WAN
interface cards (VWICs) can support voice, data, and voice and data applications,
depending on the capabilities of the router in which the VWIC is installed. Enhanced
High-speed WAN interface cards (EHWIC) provide expanded LAN and WAN
capabilities, such as Gigabit Ethernet and Ethernet switching.
Note
EHWICs (such as EHWIC-4ESG, EHWIC-4ESG-P, EHWIC-1GE-SFP-CU) are supported
on Cisco routers, like Cisco 1861-E, Cisco 1900 routers (modular), Cisco 2900, and
Cisco 3900 routers.
Cisco interface cards are available in the following two form factors to provide
greater modularity and functionality for users:
 Single-wide interface cards
 Double-wide interface cards
Single-wide interface cards can be installed in interface card slots on supported
Cisco access routers, in 1- or 2-slot network modules to be installed in network
module slots on supported Cisco access routers, and in interface card slots on
Cisco 1800 (modular), Cisco 2800, and Cisco 3800 routers.
Single-Wide Interface Card

Double-wide interface cards can only be installed in interface card slots on
Cisco1900 series, Cisco 2800 series, Cisco 2900 series, Cisco 3800 series, and
1

Cisco3900 series routers.
Double-Wide Interface Card

Cisco Access Routers and Cisco Interface Cards
The Cisco interface cards described in this document are supported on the following
Cisco routers:
 Cisco 1800 series (modular), including the Cisco 1841 routers
 Cisco 1900 series (modular), including the Cisco 1941 routers
 Cisco 2800 series, including the Cisco 2801, Cisco 2811, Cisco 2821, and Cisco
2851 routers
 Cisco 2900 series, including the Cisco 2901, Cisco 2911, Cisco 2921, and Cisco
2951 routers
 Cisco 3700 series, including the Cisco 3725 and Cisco 3745 routers
 Cisco 3800 series, including the Cisco 3825 and Cisco 3845 routers
 Cisco 3900 series, including the Cisco 3925 and Cisco 3945 routers
 Cisco MWR 1941-DC routers
 Cisco ICS 7750 routers

Interface Card Slot Locations and Numbering on Cisco
Access Routers
Interface Card Slot Locations on Cisco 1800 Series (Modular) Routers (Cisco
1841 Router Shown)

1

2

WIC, VWIC—data only, or HWIC slot 1

2

WIC, VWIC—data
HWIC slot 0

only,

or

Interface Card Slot Locations on Cisco 1900 Routers

1

EHWIC, HWIC, WIC, VWIC1 , slot 0

2

EHWIC, HWIC, WIC, slot 1, 1
double-wide2 , or 1 single-wide

1 VWIC support is for data only.
2 The double-wide slot can accommodate a single wide EHWIC, HWIC, WIC, or VWIC (data
only), on the left side of the slot

Interface Card Slot Locations on Cisco 2801 Routers

1

WIC/VIC/VWIC/HWIC slot 3

4

VIC/VWIC (voice only) slot 0

2

WIC/VIC/VWIC slot 2

5

Interface card slot divider

3

WIC/VIC/VWIC/HWIC slot 1

6

Interface card slot divider

Note
To install double-wide interface cards in Cisco 2801 routers, remove the slot divider.
When the slot dividers are removed, slot 0 and slot 1 become slot 1, and slot 2 and
slot 3 become slot 3.
Interface Card Slot Locations on Cisco 2800 (Cisco 2851 Router Shown)

3

1

HWIC slot 3

4

HWIC slot 0

2

HWIC slot 1

5

EVM1 slot

3

HWIC slot 2

6

NME2 slot

1 EVM = Extension voice module
2 NME = Network module enhanced

Note
To install double-wide interface cards in Cisco 2811, Cisco 2821, and Cisco 2851
routers, remove the slot divider. When the slot dividers are removed, slot 0 and slot 1
become slot 1, and slot 2 and slot 3 become slot 3.
Interface Card Slot Locations on Cisco 2901

1

EHWIC slot 0

3

EHWIC slot 2

2

EHWIC slot 1

4

EHWIC slot 3

Note
To install double-wide interface cards in Cisco 2901 routers, remove the slot divider.
When the slot dividers are removed, slot 0 and slot 1 become slot 1, and slot 2 and
slot 3 become slot 3.
Interface Card Slot Locations on Cisco 2911

4

1

EHWIC 0

4

EHWIC 3

2

EHWIC 1

5

Service module slot
(SM)

3

EHWIC 2

Note
To install double-wide interface cards in Cisco 2911, remove the slot divider. When
the slot dividers are removed, slot 0 and slot 1 become slot 1, and slot 2 and slot 3
become slot 3.
Interface Card Slot Locations on Cisco 2921 and 2951

1

EHWIC 0

4

EHWIC 3

2

EHWIC 1

5

2951 SM

3

EHWIC 2

2921 SM
6

2951 SM
2921 blank panel

Note
To install double-wide interface cards in Cisco 2951 routers, remove the slot divider.
When the slot dividers are removed, slot 0 and slot 1 become slot 1, and slot 2 and
slot 3 become slot 3.
Interface Card Slot Locations on Cisco 3800 Routers (Cisco 3825 Router Shown)
5

1

Network module slot 2 (extended
double-wide)

4

HWIC slot 2

2

HWIC slot 2

5

HWIC slot 3

3

HWIC slot 1

6

Network module slot 1 (extended
single-wide)

Note
To install double-wide interface cards in Cisco 3800 series routers, remove the slot
divider. When the slot dividers are removed, slot 0 and slot 1 become slot 1, and slot 2
and slot 3 become slot 3.
Interface Card Slot Locations on Cisco 3900 Series

1

EHWIC 0

5

3945 SM1

2

EHWIC 1

6

3945 SM2, 3925 SM1

3

EHWIC 2

7

3945 SM3

4

EHWIC 3

8

3945 SM4, 3925 SM2

Note
To install double-wide interface cards in the Cisco 3900 series routers, remove the
slot divider. When the slot dividers are removed, slot 0 and slot 1 become slot 1, and
slot 2 and slot 3 become slot 3.
Note
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To install double-wide service modules in the Cisco 3900 series routers, remove the
slot divider between slots SM3 and SM4 (3945), and remove the blank panel to the
right of SM2 (3925).
Interface Card Slot Locations on Cisco MWR 1941-DC Routers

1

Network module slot

3

Interface card slot 0

2

Interface card slot 1

4

Interface card slot 2

More related topics
Cisco 1900 Series Integrated Services Routers
The Available Power Supplies for the Cisco Routers
Cisco 1941 Series Integrated Services Routers Overview
The Upgrading and Installation for Cisco Router License
Cisco 1941 Series Integrated Services Routers Architecture and Modularity
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