COMSPHERE 3550 Series Data Service Units5-28 July 1999 3550-A2-GB20-40Table 5-13Port Speed (DBM) Configuration OptionsPrt1( 9.6): 9.6Next 14.4 56 12.0 9.6 4.8 2.4 1.2 Disab PrevPort 1 Speed. Primary data rate in kbps on Port 1. (Must be set to the same value in the remote DBM.)14.4 to — Select to set the port’s operating rate.1.2 kbpsDisab — Select to disable the port.Option Verification: For all ports, the DBM verifies that the sum of the individual port speeds does not exceed theprimary aggregate speed set inRate(Kbps) in the DBM option set. If the sum of the port speedsequals the primaryaggregate rate,an underspeed port selection is required.Prt2( 9.6): 9.6 for MPTT; Disab for all other configurationsNext 14.4 12.0 19.2 9.6 4.8 2.4 1.2 Disab PrevPort 2 Speed. Primary data rate in kbps on Port 2. (Must be set to the same value in the remote DBM.)14.4 to — Select to set the port’s operating rate.1.2 kbpsDisab — Select to disable the port.Option Verification: For all ports, the DSU verifies that the sum of the individual port speeds does not exceed theprimary aggregate speed set inRate(Kbps) in the DBM option set. If the sum of the port speedsequals the primaryaggregate rate,an underspeed port selection is required.Underspeed: DisabNext Disab Prt1 Prt2 PrevUnderspeed Port. Selects which port is to run slightly underspeed to allow for in-band framing and in-band secondarychannel transport, if used. If more than one port is active and the sum of the port speeds equals the primary aggregatespeed,then one synchronous port must run underspeed.The number of bits per second used for in-band framing is 10. The in-band secondary channel transport speed is set in2nd Chan(bps) and, if used, includes the 10 bps in-band framing. A port used for asynchronous operation may not be setfor underspeed.NOTE: WhenPort Cntrl is set to DSD orShare DevA is enabled (in the MUX (Setup) option set), port speeds are onlycounted once per DSD when calculating used bandwidth.Disab — No port runs underspeed during primary operation.Prt1 or — Selected port runs underspeed during primary operation.Prt2
