Specifications

21
Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
New and Changed Information
Multiport T1/E1 ATM Port Adapters with Inverse Multiplexing over ATM
Platforms: Cisco 7200 series, Cisco 7500/RSP series
The inverse multiplexing over ATM (IMA) port adapter is a single-width port adapter that allows
Cisco 7100 series, Cisco 7200 series, and Cisco 7500 series routers to support inverse multiplexing over
ATM. These port adapters allow WAN uplinks at speeds ranging from 1.544 Mbps to 12.288 Mbps for
T1 connections and from 2.048 Mbps to 16.384 Mbps for E1 connections.
With this scalable ATM IMA solution from Cisco, network designers and managers can deploy only the
bandwidth they need, using multiple T1 or E1 connections instead of more expensive T3 or OC-3 lines
to bridge LANs and ATM WAN applications. Enterprises and branch offices can aggregate traffic from
multiple lower-bandwidth physical transmission media, such as T1 or E1 pipes, to transmit voice and
data at high-bandwidth connection speeds. See the following document for further information:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120xe/120xe7_
1/imatm.htm
PA-A3 OC-12 ATM Port Adapter
Platforms: Cisco 7500/RSP series
The PA-A3 OC-12 is a dual-width ATM port adapter that provides a single-port, 622.08 Mbps
connection from Cisco 7500 series routers to any ATM switch. The PA-A3 OC-12 includes two
hardware versions (PA-A3-OC12MM and PA-A3-OC12SMI) that support the following
standards-based physical interfaces:
• OC-12c/STM-4 multimode
• OC-12c/STM-4 single-mode intermediate reach
See the following document for further information:
http://www.cisco.com/univercd/cc/td/doc/product/cable/cab_rout/cfig_nts/6228oc12/6228ovrn.htm
Per Interface Rate Control
Per Interface Rate Control (PIRC) controls the input access rate on a single physical interface on the
Engine 2 packet-over-SONET (POS) line cards. Examples of this type of line card are the Enhanced
OC-48c/STM-16c POS line card and the Enhanced Quad OC-12c/STM-4c POS line card. You can
configure PIRC to either set the precedence of a packet and resend it, transmit the packet as-is, or drop
the packet.
VIP-4
Platforms: Cisco 7200 series, Cisco 7500/RSP series
The VIP-4 is the fourth generation of Versatile Interface Processors for use with Cisco 7000 series
routers using the Cisco 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis
Interface (RSP7000CI) and with Cisco 7500 series routers (which also include the Cisco 7507-MX and
Cisco 7513-MX routers). The VIP4 installs in the interface processor slots in your Cisco 7000 series or
Cisco 7500 series router.