The line rate of a communications link is the data rate of its raw bitstream, including all framing bits and other physical layer overhead.[citation needed]
For example, the line rate of a T1 data link is 1.544 Mbit/s, of which 1.536 Mbit/s is available for data communications, and the remaining 8000 bit/s is framing overhead. ISDN Basic Rate Interface has a line rate of 160 kbit/s, and a user data rate of 144 kbit/s
Additional factors that reduce the throughput of communications links below their line rate can include packetization overhead, burstiness, link contention, and inefficient use of link resources by higher-level protocols.
See also
- Gross bit rate
- Data signalling rate
- Data transfer rate
- Line code
- Symbol rate
- Modulation rate
- Clock rate
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