Cisco 2513 Spezifikationen PDF herunterladen (Seite 23)

Preparing to Install the Router 2-9

Preparing to Connect to a Network

Speed and Distance Limitations

Serial signals can travel a limited distance at any given bit rate; generally, the slower the

data rate, the greater the distance. All serial signals are subject to distance limits, beyond

which a signal degrades signiﬁcantly or is completely lost.

Table 2-3 lists the maximum speeds and distances for EIA/TIA-232 signals. This signaling

standard supports unbalanced circuits at signal speeds up to 64 kbps.

Balanced drivers allow EIA/TIA-449 signals to travel greater distances than

the EIA/TIA-232 signals. Table 2-4 lists the maximum speeds and distances for

EIA/TIA-449, V.35, X.21, and EIA-530 signals.

Table 2-3 EIA/TIA-232 Speed and Distance Limitations

Data Rate

(Baud)

Distance

(Feet)

Distance

(Meters)

2400 200 60

4800 100 30

9600 50 15

19200 50 15

38400 50 15

64000 25 7.6

Table 2-4 EIA/TIA-449, V.35, X.21, and EIA-530 Speed and Distance

Limitations

Data Rate

(Baud)

Distance

(Feet)

Distance

(Meters)

2400 4,100 1,250

4800 2,050 625

9600 1,025 312

19200 513 156

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Cisco 2513 Spezifikationen Seite 23