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Cisco IAD2430 Series Integrated Access Devices Hardware Installation Guide
OL-4234-06
Chapter 2 Planning Your Installation
Distance Limitations for Interface Cables
Caution EIA/TIA-232 is often used at greater distances than specified in Table 2-2 on page 2-4. If you
understand the electrical problems that can arise and can compensate for them, you might still obtain
good results; however, we recommend that you keep your cable runs within the standard-defined
distances.
Table 2-3 shows the standard relationship between signal rate and maximum distance for EIA/TIA-449,
V.35, and X.21 signals.
Caution The EIA/TIA-449 and V.35 interfaces support data rates up to 2.048 megabits per second (Mb/s).
Exceeding this maximum could result in loss of data and is not recommended.
Table 2-4 shows the standard relationship between signal rate and maximum distance for EIA/TIA-530
and EIA/TIA-530A signals.
19200 25 7.6
38400 12 3.4
56000 8.6 2.6
Table 2-2 EIA/TIA-232 Speed and Distance Limitations (continued)
Signal Rate Distance (Feet) Distance (Meters)
Ta b l e 2-3 EIA/TIA-449, V.35, and X.21 Speed and Distance Limitations
Signal Rate Distance (Feet) Distance (Meters)
2400 4100 1250
4800 2050 625
9600 1025 312
19200 513 156
38400 256 78
56000 102 31
T1/E1
(1544000)
50 15
Ta b l e 2-4 EIA/TIA-530/EIA/TIA-530A Speed and Distance Limitations
Signal Rate Distance (Feet) Distance (Meters)
Up to 90000 3940 1200
110000 460 140
120000 425 130
130000 395 120
1000000 330 100
T1/E1
(1544000)
230 70