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Configuring the T1 Frame Checksum
By default, T1 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.
To configure a 32-bit checksum, include the fcs 32 statement at the [edit interfaces interface-name t1-options] hierarchy level:
[edit interfaces interface-name t1-options]fcs 32;
To return to the default 16-bit frame checksum, delete the fcs 32 statement from the configuration:
[edit]user@host# delete interfaces t1-fpc/pic/port t1-options fcs 32
To explicitly configure a 16-bit checksum, include the fcs 16 statement at the [edit interfaces interface-name t1-options] hierarchy level:
[edit interfaces interface-name t1-options]fcs 16;
