Specifications
Preparing for Installation 2-9
Site Requirements
Table 2-6 IEEE Standard EIA/TIA-232C Transmission Speed versus Distance
Balanced drivers allow EIA/TIA-449 signals to travel greater distances than EIA/TIA-232.
Table 2-7 shows the standard relationship between bit rate and distance for EIA/TIA-449 signals.
Table 2-7 IEEE Standard EIA/TIA-449 Transmission Speed versus Distance
Note The recommended distance limits for EIA/TIA-449 shown in Table 2-7 are also valid for
V.35, X.21, and EIA-530. However, you can get good results at distances and rates far greater than
these. In common practice, EIA/TIA-449 and EIA-530 support 2-Mbps rates, and V.35 supports
4-Mbps rates without any problems.
SONET Connections for the AIP
The SONET specification for fiber-optic transmission defines two types of fiber: single mode and
multimode. Modes can be thought of as bundles of light rays entering the fiber at a particular angle.
Single-mode fiber allows only one mode of light to propagate through the fiber, while multimode
fiber allows multiple modes of light to propagate through the fiber. As multiple modes of light
propagate through the fiber, they travel different distances depending on the entry angles. This
causes them to arrive at the destination at different times (a phenomenon called modal dispersion).
As a result, single-mode fiber is capable of higher bandwidth and greater cable run distances than
Rate (bps) Distance (Feet)
Distance
(Meters)
2400 200 60
4800 100 30
9600 50 15
19200 25 7.6
38400 12 3.7
56000 8.6 2.6
Rate (bps) Distance (Feet) Distance (Meters)
2400 4100 1250
4800 2050 625
9600 1025 312
19200 513 156
38400 256 78
56000 102 31
128000 76 23
256000 50 15
1544000 (T1) 50 15
2000000 40 12
4000000 25 8