MTC 511 Link. Contractor shall maintain the data link from the AVLS to the MTC 511 system so that AVLS data is available to the MTC 511 system 24 hours per day, 7 days per week. Contractor shall pay to the SFMTA as liquidated damages $2,500 for any period exceeding four (4) continuous hours where Contractor fails to maintain the MTC 511 Link as required herein.