User`s guide

PassFinder AP2520 VoIP Router/Gateway Operation Manual Version 1.10 / Mar. 2002
AddPac Technology Co., Ltd. -
26 -
2.2.3.1.2. Transfer Speed and Distance Limitations
Synchronous signals allow communication within the distance limited by the Bit
Rate. Generally, the lower Data Rate allows communication to a further
distance. All serial signals are subject to limitation by distance, and signals
exceeding this limitation will drastically dissipate, eventually losing the signal
entirely.
Table 2-2 shows the relationship between the EIA/TIA-232(RS-232c), used for the
AP2520 router’s console cable, signal distance and its transfer speed. This signal
standard supports a maximum transfer speed of 64Kbps. Table 2-3 shows the
relationship between the V.35 standard, used for the AP2520 router’s
WAN(Serial) cable, and its transfer speed.
Data Rate (Baud) Distance (Feet) Distance (Meter)
2,400 200 60
4,800 100 30
9,600 50 15
19,200 50 15
38,400 50 15
64,000 25 7.6
[ Table 2-2 EIA/TIA-232 Transfer Speed and Distance Limitation ]
Data Rate (Baud) Distance (Feet) Distance (Meter)
2,400 4100 1250
4,800 2050 625
9,600 1025 312
19,200 513 156
38,400 256 78
56,000 102 31
[ Table 2-3 EIA/TIA-449, V.35 Transfer Speed and Distance Limitation]