Cisco Cisco 1900 2900 3900 Series 8-Port Gigabit Ethernet HS-WIC with PoE
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Table 1.
Cellular Technology and Associated Theoretical Bandwidths
GSM
TDMA-based worldwide
Cellular standard
Speeds: 28 kbps
CDMA
IS-95 followed by cdmaOne
Adopted in North America, parts of South America, and Asia
Speeds: 28 kbps
GPRS, EDGE (2.5G)
Packet data service over GSM overlay, using multiple time slots
Downlink: 384 kbps
Uplink: 180 kbps
1xRTT (2.5G)
Packet data service using single 1.25-MHz channel
Downlink: 307 kbps
Uplink: 153 kbps
UMTS/HSDPA (3G)
WCDMA-based data services
Downlink: 3.6 Mbps
Uplink: 384 kbps
EVDO Rev1 (3G)
Dedicated radio channel for data
Downlink: 3.1 Mbps
Uplink: 1.8 Mbps
LTE (4G)
Packet-switched data services
Downlink: Up to 100 Mbps
Uplink: Up to 50 Mbps
LTE (4G)
Packet-switched data services
Downlink: Up to 50 Mbps
Uplink: Up to 25 Mbps
2.2 Throughput
Cellular throughput is stated as a theoretical maximum speed that the given radio technology can provide.
Theoretical maximum speed is based on the mathematical calculations of the radio resources and associated bits.
In practice, users can achieve 30 percent of the theoretical speeds on average on a normally loaded network.
Throughput is shared per cell sector, per carrier frequency. For EVDO Rev A, total theoretical throughput per
sector is 3.1-Mbps downlink, 1.8-Mbps uplink. For HSDPA, the theoretical throughput of the EHWIC chipset is
3.6-Mbps downlink, 384-kbps uplink. (Newer versions of HSDPA support 7.2-Mbps downlink) Actual throughput
depends on network conditions at the time, Received Signal Strength Indicator (RSSI), and cellular backhaul
facilities.
LTE has a theoretical
capacity of up to 100 Mbps in the downlink and 50 Mbps in the uplink if a 20-MHz
antenna arrays, are used. The physical radio interface uses Orthogonal Frequency Division Multiple Access
A), now named
2.3 Latency
Latency in the 4G cellular network is designed to be significantly lower than in 3G networks. Latency is dependent
on production networks.
Table 2.
Cellular Modes and Associated Bandwidth and Latency Characteristics
Technology or Service
Uplink
Downlink
Average Latency (Round-Trip Time [RTT])
EDGE
80 kbps
140 kbps
250-300 ms
UMTS
250 kbps
400 kbps
150-200 ms
HSDPA
300 kbps
700 kbps
100 ms
1xRTT
80 kbps
150 kbps
250 ms
EVDO Rel0
140 kbps
500 kbps
125 ms