Disabling T3 C-Bit Parity Mode
C-bit parity mode controls the type of framing that is present on the transmitted T3 signal. When C-bit parity mode is enabled, the C-bit positions are used for the FEBE, FEAC, terminal data link, path parity, and mode indicator bits, as defined in ANSI T1.107a-1989. When C-bit parity mode is disabled, the basic T3 framing mode (M23) is used.
By default, C-bit parity mode is enabled. To disable C-bit parity mode and use M23 framing for your T3 link, include the no-cbit-parity statement at the [edit interfaces interface-name t3-options] hierarchy level:
 | Note: For ATM, ATM2 IQ2, IQ2-E, and T3 interfaces, M23 framing is used when the no-cbit-parity statement is included. For all other interfaces, M13 framing is used when the no-cbit-parity statement is included. |
To return to the default, enabling C-bit parity mode, delete the no-cbit-parity statement from the configuration:
To explicitly enable C-bit parity mode, include the cbit-parity statement at the [edit interfaces interface-name t3-options] hierarchy level:
