Specifications

15
Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
New and Changed Information
New Features in Cisco IOS Release 12.0(13)S
Many of the new features in Cisco IOS Release 12.0 S were introduced in other Cisco IOS releases. For
more complete information, refer to the original release.
6-Port Channelized T3-SMB Line Card
Platforms: Cisco 12000 series
The 6CT3-SMB line card consists of high-density digital signal level 3 (DS3) service through six
copper T3 ports. T3 transmits DS3-formatted data at 44.736 Mbps through the telephone switching
network that is used in a digital WAN carrier facility. Each T3 port can carry a full duplex DS3 rate
signal. A T3 can be channelized into 28 independent DS1 data channels or up to 35 NxDS0. A total of
168 DS1 channels are supported, or 210 NxDS0 per line card.
The 28 DS1 channels are multiplexed into 7 DS2 channels. The 7 DS2 channels are multiplexed into a
single DS3 signal. The6CT3-SMB line card supports further channelization down to the DS0 time slot
level (56 or 64 kilobits per second [kbps]).
The 6CT3-SMB line cards perform the High-Level Data Link Control (HDLC) encapsulation and
de-encapsulation functions, and all other necessary functions including timing, signaling, and framing
in compliance with DS1 and DS3 specifications. The six T3 ports are numbered 0 to 5.
The 6CT3-SMB line card is connected to devices on the remote customer side, using sub-miniature
bayonet coupling (SMB) connectors. A single T3 port consists of one SMB connector for receiving (Rx)
and one SMB connector for transmitting (Tx).
BGP Policy Accounting on Engine 2
Platforms: Cisco 12000 series
Cisco IOS 12.0 S now supports BGP policy accounting on Engine 2 line cards. Please see the “BGP
Policy Accounting” section on page 27 for more information about this feature.
Cisco 7500 Single Line Card Reload
Platforms: Cisco 7500/RSP series
Before the introduction of the Cisco 7500 Single Line Card Reload feature, the only method of
correcting a line card hardware failure for one line card on a Cisco 7500 series router required the
execution of a Cbus Complex, a process that reloaded every line card on the network backplane. The
amount of time taken to complete the Cbus Complex was often inconvenient, and no network traffic
could be routed or switched during the Cbus Complex process.
The Cisco 7500 Single Line Card Reload feature allows users to correct a line card hardware failure on
a Cisco 7500 series router by reloading the failed line card without reloading any other line cards on
the network backplane. During the single line card reload process, all physical lines and routing
protocols on the other line cards of the network backplane remain active. Reloading a single line card
is also significantly faster than the Cbus Complex execution process.