Cabletron Systems 42T User Manual

Contents

Cabletron Systems 42T User Manual Manual pdf 23 page image

REQUIREMENTS/SPECIFICATIONS2-42.1.2 STP Cable SpecificationsMicroMMACs 42T and 44T and TPIMs T1 and T4 support IBM Type 1,2, 6, and 9 STP cabling as described below:• IBM Type 1: Two STP lengths of 22 AWG solid wire for data. Usedfor the longest cable runs within building walls of buildings.• IBM Type 2: Similar to Type 1 data cable, but having four additionalUTP lengths of 22 AWG solid wire carried outside of the shield casing.Typically used for voice communication and often used to wire cableruns within the walls of buildings.• IBM Type 6: Two STP lengths of 26 AWG stranded wire for data.Used in patch panels or to connect devices to/from wall jacks.Attenuation for Type 6 cable is 3/2 x Type 1 cable (66 m of Type 6=100 meters of Type 1).• IBM Type 9: Similar to Type 1, but uses 26 AWG solid wire.Attenuation for Type 9 cable is 3/2 x Type 1 cable (66 m of Type 9= 100 meters of Type 1).Attenuation and ImpedanceThe attenuation values shown in Table 2-3 include the attenuation of thecables, connectors, patch panels, and reflection losses due to impedancemismatches in the segment.Maximum Lobe LengthsThe lobe length is the physical length of the cable connecting a station toits TCU port at the MicroMMAC-T. Table 2-4 lists the maximum lobeTable 2-3. STP Cable SpecificationsTypes Frequency Impedance Attenuation1 & 2 4 MHz16 MHz150Ω + 15%150Ω + 15%<22 dB/km (6.7 db/1000 ft.)<45 dB/km (13.7 db/1000 ft.)6 & 9 4 MHz16 MHz150Ω + 15%150Ω + 15%<33 dB/km (10 db/1000 ft.)<66 dB/km (20 db/1000 ft.)