Configuring the T3 Frame Checksum
By default, T3 interfaces use a 16-bit frame checksum. You can configure a 32-bit checksum, which provides more reliable packet verification. However, some older equipment might not support 32-bit checksums.
On a channelized OC12 interface, the fcs statement is not supported. To configure FCS on each DS3 channel, you must include the t3-options fcs statement in the configuration for each channel.
To configure a 32-bit checksum, include the fcs statement at the [edit interfaces interface-name t3-options] hierarchy level:
To return to the default 16-bit frame checksum, delete the fcs 32 statement from the configuration:
To explicitly configure a 16-bit checksum, include the fcs statement at the [edit interfaces interface-name t3-options] hierarchy level: