Cisco Cisco IOS Software Release 12.3(14)T
Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
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Cisco IOS Release 12.3(14)T
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Restrictions for Second-Generation 1- and 2-Port T1/E1
Multiflex Trunk Voice/WAN Interface Cards
Multiflex Trunk Voice/WAN Interface Cards
Cisco IOS Image
To run these features on T1/E1 interfaces, you must install an IP Plus or IP Voice image (minimum) of
Cisco IOS Release 12.3(14)T or a later release.
Cisco IOS Release 12.3(14)T or a later release.
VWIC Support
The multiflex VWIC cards are supported on Cisco 2600XM series, Cisco 2691, Cisco 2800 series,
Cisco 3700 series, and Cisco 3800 series routers when installed on the network modules listed in
Cisco 3700 series, and Cisco 3800 series routers when installed on the network modules listed in
. The multiflex VWIC cards can also be installed in any VIC slot on the router.
Independent Clocking Mode
The independent clocking mode is supported only on these modules:
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VWIC2-1MFT-G703
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VWIC2-2MFT-G703
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VWIC2-2MFT-T1/E1
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VWIC2-1MFT-T1/E1
To enable independent clocking mode, use the keyword independent in the clock source command. The
independent keyword expands on the clock source internal and clock source line commands to specify
that the port can operate on an independent clocking domain. Prior to the addition of the independent
keyword, port 0 was the default primary clock source, and port 1 was the default secondary clock source
and is loop-timed. With independent clocking enabled, this dependency no longer exists, so the
independent keyword means that both ports can be independently clocked.
independent keyword expands on the clock source internal and clock source line commands to specify
that the port can operate on an independent clocking domain. Prior to the addition of the independent
keyword, port 0 was the default primary clock source, and port 1 was the default secondary clock source
and is loop-timed. With independent clocking enabled, this dependency no longer exists, so the
independent keyword means that both ports can be independently clocked.
When independent clocking is configured, the controller will support only one channel group and no
voice applications. If more than one channel group is configured, the following error message occurs:
voice applications. If more than one channel group is configured, the following error message occurs:
channel-group 2 timeslots 3
%Channel-group already created.
%Only 1 channel-group can be configured with independent clocking.
%Insufficient resources to create channel group