Cisco Cisco IOS Software Release 12.4(23)

The Cisco SLT feature in Cisco IOS Release 12.4 supports the Cisco 2611XM and Cisco 2651XM 
routers exclusively. The Cisco SLT feature is not supported with any other Cisco 2600 series chassis. For 
more information about the Cisco 2600 series in Cisco IOS Release 12.4, see the 

. 

For detailed descriptions of the new hardware features, see the 

. 

For additional information about supported hardware for this platform and release, see the 
Cisco Software Advisor at the following location:

 lists the supported interfaces for the Cisco SLT solution data rate.

For feature support in Cisco IOS Release 12.4, see the 

1.

See E1/T1 Multiflex Voice/WAN Interface Cards in this table.

LAN Interfaces

2-port Ethernet (10BASE-T)

Cisco 2611XM

2-port Ethernet (10/100BASE-T)

Cisco 2651XM

E1/T1 Multiflex 
Voice/WAN Interface 
Cards

1-port T1 multiflex trunk interface (VWIC-1MFT-T1)

All Cisco 2600 series platforms

1-port E1 multiflex trunk interface (VWIC-1MFT-E1)

All Cisco 2600 series platforms

2-port T1 multiflex trunk interface (VWIC-2MFT-T1)

All Cisco 2600 series platforms

2-port E1 multiflex trunk interface (VWIC-2MFT-E1)

All Cisco 2600 series platforms

2-port T1 multiflex trunk interface with drop-and-insert 
(VWIC-2MFT-T1-DI)

All Cisco 2600 series platforms

2-port E1 multiflex trunk interface with drop-and-insert 
(VWIC-2MFT-E1-DI)

All Cisco 2600 series platforms

WAN Interface Cards

1-port high-speed serial (up to 2.048 Mbps)

All Cisco 2600 series platforms

2-port dual high-speed serial (up to 2.048 Mbps; 
asynchronous/synchronous support)

All Cisco 2600 series platforms

1-port serial with four-wire 56/64-kbps DSU/CSU interface 
card (WIC-1DSU-56K4)

All Cisco 2600 series platforms