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The PA-A3-T3 and PA-A3-E3 port adapters were introduced in Cisco IOS Release 11.1(18)CC. This feature module has been updated to include information on the PA-A3-OC3MM, PA-A3-OC3SMI, and PA-A3-OC3SML ATM Port Adapters, which were introduced in Cisco IOS Release 11.1(19)CC.
The enhanced ATM port adapter is a new generation of single-wide, single-port ATM port adapters available on Cisco 7200 series routers, Cisco 7500 series routers, and Cisco 7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis Interface (RSP7000CI). The PA-A3 port adapters include five hardware versions that support the following standards-based physical interfaces:
For more information on the PA-A3 port adapters, refer to the PA-A3 Enhanced ATM Port Adapter Installation and Configuration publication that accompanies the hardware.
The enhanced ATM port adapter supports the following features:
This feature is supported on these platforms:
To configure the PA-A3 ATM port adapters, refer to the PA-A3 Enhanced ATM Port Adapter Installation and Configuration publication that accompanies the hardware. For further information on configuring an ATM port adapter, see the "Configuring ATM" chapter of the Wide-Area Networking Configuration Guide. For information on other commands that can be used by an ATM interface, refer to the Cisco IOS Release 11.1 configuration guides.
For configuration examples for the PA-A3 port adapters, refer to the PA-A3 Enhanced ATM Port Adapter Installation and Configuration publication that accompanies the hardware. For further information on configuring the PA-A3 port adapter, see the "Configuring ATM" chapter of the Wide-Area Networking Configuration Guide.
This section documents new or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 11.1 command references.
To enable scrambling of the ATM cell payload for the DS-3 PLIM on an ATM interface, use the atm ds3-scramble interface configuration command. To disable scrambling of the ATM cell payload for the DS-3 PLIM, use the no form of this command.
atm ds3-scrambleThis command has no keywords and arguments.
DS3 scrambling is disabled.
Interface configuration
This command was modified in Cisco IOS Release 11.1 CA to change the command syntax from ds3 scramble to atm ds3-scramble.
D3 scrambling is used to assist clock recovery on the receiving end.
The following example disables DS3 scrambling on the interface:
Router(config)# interface atm 4/0 Router(config-if)# no atm ds3-scramble
To enable scrambling of the ATM cell payload for the E3 PLIM on an ATM interface, use the atm e3-scramble interface configuration command. To disable scrambling of the ATM cell payload for the E3 PLIM, use the no form of this command.
atm e3-scrambleThis command has no keywords and arguments.
E3 scrambling is enabled.
Interface configuration
This command first appeared in Cisco IOS Release 11.1 CA.
E3 scrambling is used to assist clock recovery on the receiving end.
The following example disables E3 scrambling on the interface:
Router(config)# interface atm 2/0 Router(config-if)# no atm e3-scramble
To specify DS3 line framing on an ATM interface, use the atm framing interface configuration command. To return to the default C-bit with Physical Layer Convergence Protocol (PLCP) framing, use the no form of this command.
atm framing [cbitadm | cbitplcp | m23adm | m23plcp]
cbitadm | (Optional) Specifies C-bit with ATM direct mapping. |
cbitplcp | (Optional) Specifies C-bit with PLCP framing. This is the default. |
m23adm | (Optional) Specifies M23 ATM direct mapping. |
m23plcp | (Optional) Specifies M23 with PLCP framing. |
cbitplcp
Interface configuration
This command was modified in Cisco IOS Release 11.1 CA to include the ATM CES port adapter and in Release 11.1 CC to include the PA-A3 enhanced ATM port adapter.
This command is available on Cisco 4500 and Cisco 4700 routers with DS3 access speeds, on Cisco 7200 series routers with the ATM CES port adapter, and on Cisco 7200 series routers, Cisco 7500 series routers, and Cisco 7000/RSP7000 series routers with the PA-A3 enhanced ATM port adapter.
Framing on the interface must match that on the switch for this ATM link.
The following example specifies M23 ADM framing on a router that has been set up with DS3 access to an ATM network:
Router(config)# interface atm 4/0 Router(config-if)# atm framing m32adm
To specify E3 line framing, use the atm framing interface configuration command. To return to the default G.751 Physical Layer Convergence Protocol (PLCP) framing, use the no form of this command.
atm framing [g832adm | g751adm | g751plcp]
g832adm | (Optional) Specifies G.832 ATM direct mapping. |
g751adm | (Optional) Specifies G.751 ATM direct mapping. |
g751plcp | (Optional) Specifies G.751 PLCP encapsulation. This is the default. |
g751plcp
Interface configuration
This command was modified in Cisco IOS Release 11.1 CA to include the g751plcp keyword.
The default framing is described in the ITU-T Recommendation G.751.
Framing on the interface must match that on the switch for this ATM link.
The following example specifies G.832 ADM framing on a router that has been set up with E3 access to an ATM network:
Router(config)# interface atm 4/0 Router(config-if)# atm framing g832adm
To specify the cable length (line build-out) for the ATM interface, use the atm lbo interface configuration command. To return to the default, use the no form of this command.
atm lbo {long | short}
long | Specifies a cable length greater than 50 feet. |
short | Specifies a cable length of less than 50 feet. This is the default. |
short
Interface configuration
This command first appeared in Cisco IOS Release 11.1 CA.
The following example specifies that the ATM interface use a cable less than 50 feet:
Router(config)# interface atm 4/0 Router(config-if)# atm lbo short
To place the ATM interface into loopback mode, use the following form of the loopback interface configuration command. To remove the loopback, use the no form of this command.
loopback [cell | line | payload]
cell | (Optional) Places the interface into external loopback at the cell level. |
line | (Optional) Places the interface into external loopback at the line. This is the default. |
payload | (Optional) Places the interface into external loopback at the payload level. |
line; packets loop from the ATM interface back to the ATM network.
Interface configuration
This command was modified in Cisco IOS Release 11.1 CC to remove the diagnostic and test options for the PA-A3 enhanced ATM port adapter.
The following example loops all packets back to the ATM interface:
Router(config)# interface atm 4/0 Router(config-if)# loopback diagnostic
Posted: Fri Jun 18 13:55:39 PDT 1999
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