Document the physical topology, including cable types and cable locations, of each internetworking device.
Cabling the Campus core_sw_a ISDN Cloud Leased Line/ Frame Relay Legend Fast Ethernet/ Ethernet ISDN Dedicated Core Server
Physical Data-Link (MAC Layer) LAN Physical Layer Implementations
Physical layer implementations vary.
Some implementations support multiple physical media.
Ethernet 100baseTX 10BaseT 802.3 10Base5 10Base2 100baseFX 802.3 Specifications for 10-Mbps Ethernet 802.3u Specifications for 100-Mbps (Fast) Ethernet 100baseT4 10BaseF DIX Standard
Positioning Ethernet in the Campus Access Layer Distribution Layer Core Layer Ethernet 10BaseT Position Fast Ethernet Position Access Layer Distribution Layer Core Layer Provides connectivity between the end-user device and the access switch. Not typically used at this layer. Gives high-performance PC and workstations 100-Mbps access to the server. Provides connectivity between access and distribution layers. Provides connectivity from the distribution to core layer. Provides connectivity from the server block to the core layer. Provides inter-switch connectivity. Not typically used at this layer.
Comparing Ethernet Media Requirements 10Base5 100BaseTX 10BaseT 100BaseFX Media Maximum Segment Length Topology Connector 50-ohm coax (thick) 500 meters Bus 100 meters Star Star Point-to-point EIA/TIA Cat 3, 4, 5 UTP 2 pair EIA/TIA Cat 5 UTP 2 pair 62.5/125-micron multi-mode fiber AUI ISO 8877 (RJ-45) Duplex media interface connector (MIC) ST ISO 8877 (RJ-45) 400 meters 100 meters
Differentiating Between Connections AUI connectors are DB-15. ISO 8877 (RJ-45) connectors and jacks are slightly larger than RJ-11 phone connectors and jacks. Fiber Connector Port
UTP Device The RJ-45 Connector 1 8 8 Pair 4 R4 1 2 3 4 5 6 7 Wire Pair: T is Tip R is Ring Pair 3 T2 Pair 3 R2 Pair 2 T3 Pair 1 R1 Pair 1 T1 Pair 2 R3 Pair 4 T4 Pin
UTP Implementation Straight-Through Wires on cable ends are in same order. Pin Label 1 RD+ 2 RD- 3 TD+ 4 NC 5 NC 6 TD- 7 NC 8 NC Cable 10BaseT/ 100BaseTX Straight-Through Pin Label 1 TD+ 2 TD- 3 RD+ 4 NC 5 NC 6 RD- 7 NC 8 NC Server/Router 1 8 Straight-Through Cable 8 1 Hub/Switch 8 1 w g g b w o w b o br w br 8 1 w g g b w o w b o br w br
UTP Implementation Crossover Some wires on cable ends are crossed. Cable 10BaseT/ 100BaseT Crossover Pin Label 1 RD+ 2 RD- 3 TD+ 4 NC 5 NC 6 TD- 7 NC 8 NC Pin Label 1 RD+ 2 RD- 3 TD+ 4 NC 5 NC 6 TD- 7 NC 8 NC Crossover Cable 1 8 1 8 8 1 w g g w b w o b o br w br Hub/Switch Hub/Switch 8 1 w o o b w g w b g br w br
UTP Implementation of Straight-Through Versus Crossover
Use a crossover cable when BOTH ports are designated with an “x” or neither port is designated with an “x.”
Use straight-through when only one port is designated with an “x.”
Cabling Routers for ISDN Connections (cont.) !!!WARNING!!! Do not connect a cable to an ISDN port unless it is from an ISDN switch or ISDN wall jack. If you connect a cable from any other device to the BRI port, you will ruin the non-ISDN device. Cisco Router ISDN BRI Port