Setting The Framing Type - Cisco 10000 Series Configuration Manual

Chapter 15 8-Port Unchannelized E3/T3 Line Card Configuration
In the following example, the fallback-clocking is set to on.
Router(config-if)# interface dsx3 1/0/0
Router(config-if)# fallback-clocking on

Setting the Framing Type

Use the framing command to specify the framing type for the T3 interface using the following format:
[no] framing [auto-detect | c-bit | m13]
Where:
•
•
•
The default is no framing.
Use the no form of this command to restore the default auto-detect framing type.
In the following example, framing is set to m13:
Router(config)# interface serial 1/0/0
Router(config-if)# framing m13
Specifying the Idle-Character
Use the idle-character command to set a specific character on the interface for transmission between
HDLC packets using the following format:
[no] idle-character [flags | marks]
Where:
•
•
The default idle character is 0x7e.
Use the no form of this command to return the idle character to its default value.
In the following example, the idle character is set to flags (0x7e):
Router(config)# interface serial 1/0/0
Router(config-if)# idle-character flags
Some systems interpret marks (0xff), as an abort signal. Therefore, the flags (0x7e) setting is preferred.
Note
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auto-detect detects whether or not the far-end T3 line is currently using m13 or c-bit framing and
automatically configures itself to match.
If the port detects that framing rapidly toggles between m13 and c-bit framing, the port
Note
forces m13 framing.
c-bit specifies c-bit framing.
m13 specifies m13 framing. m13 is a Cisco framing method that functions the same as m23 framing.
flags sets an idle character of 0x7e
marks sets an idle character of all 0xff
Cisco 10000 Series Router Line Card Configuaration Guide
Interface Configuration Commands
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