| Bits | Description |
|---|---|
| 31:3 | Reserved |
| 2:0 | Current HDLC Rate Encoding 000: No HDLC channel 001: 240 kb/s 010: 480 kb/s 011: 960 kb/s 100: 1,920 kb/s 101: 2,400 kb/s 110: Highest possible HDLC bit rate for line rates above 3,072.0 Mb/s. 3,840 kb/s when core is operating at 4,915.2 Mb/s 4,800 kb/s when core is operating at 6,144.0 Mb/s 7,680 kb/s when core is operating at 8,110.08, 9,830.4, 10,137.6, 12,165.12, and 24,330.24 Mb/s 111: User defined HDLC rate |