COMSPHERE 3600 Series Data Service Units1-4 July 1999 3610-A2-GB91-90Order the COMSPHERE 3600 Series Data ServiceUnits, Models 3610 and 3611, Dial Backup Module andSNA Diagnostic Interface Options, Applications Guide ifthe Dial Backup Module (DBM) or SNA DiagnosticInterface options are part of your configuration.Order the COMSPHERE 3600 Series Data ServiceUnits, Models 3610 and 3611, Time Division Multiplexer,Multichannel Multipoint, and Digital Bridge Options,Applications Guide if your application uses a TDM orMCMP circuit card, or uses DBM-Vs, DBM-Ss, orDBM-Ds. The SNA Diagnostic Interface option, as itapplies to these applications, is also covered in thisapplications guide.Feature DescriptionThis section provides descriptions of how to use theDSUs as local area data sets (LADS), DSU compatibilitywith other equipment, the NMS interface, rate adaption,available diagnostics, in-band secondary channeltransport, network control and tributary addressing, andaggregate switching.LADS OperationThe 3600 Series DSUs can be used as a local area dataset (LADS) to provide a point-to-point link between anytwo data devices having like protocols.Multipoint LADS can be achieved by using an extraDSU with TDM that is configured as an extended orcentral-site bridge. The digital bridge essentially“bridges” multiple point-to-point LADS circuits into asingle front-end processor (FEP). Refer to theCOMSPHERE 3600 Series Data Service Units,Models 3610 and 3611, Time Division Multiplexer,Multichannel Multipoint, and Digital Bridge Options,Applications Guide for more information.The digital network interfaces connect to a 4-wire,nonloaded metallic pair. Both point-to-point and bridgedLADS can operate at 2.4, 4.8, 9.6, 19.2, 38.4, 56, or64 kbps full-duplex. Table 1-1 summarizes the distancelimitations governing use of the 3600 Series DSUs forLADS operation.For bridged LADS information, order theCOMSPHERE 3600 Series Data Service Units,Models 3610 and 3611, Time Division Multiplexer,Multichannel Multipoint, and Digital Bridge Options,Applications Guide.Table 1-1LADS Connection DistancesData Rate Wire Gauge (AWG)Data Rate(kbps) 19 22 24 262.4 20.0 mi(32.2 km)16.6 mi(26.7 km)12.7 mi(20.5 km)9.4 mi(15.1 km)4.8 19.4 mi(31.2 km)12.7 mi(20.5 km)9.6 mi(15.4 km)7.1 mi(11.5 km)9.6 15.2 mi(24.5 km)9.7 mi(15.6 km)7.3 mi(11.7 km)5.6 mi(9.0 km)19.2 1 11.8 mi(19.0 km)7.5 mi(12.1 km)5.7 mi(9.2 km)4.2 mi(6.8 km)38.4 11.2 mi(18.0 km)6.5 mi(10.5 km)4.6 mi(7.4 km)3.2 mi(5.1 km)56 9.2 mi(14.8 km)5.4 mi(8.7 km)3.8 mi(6.2 km)2.8 mi(4.5 km)64 9.2 mi(14.8 km)5.4 mi(8.7 km)3.8 mi(6.2 km)2.8 mi(4.5 km)1 Power level is –10 dBm.
