Comtech EF Data CDM-800 Uživatelský manuál stáhnout pdf (Strana 39)

Traditional VSAT Jitter & Latency

• A number of independent tests have noted excessive

jitter and latency for traditional VSATs

• Testing performed by a major operator found wide

variations in delay, jitter and voice quality

VSAT Configuration Metric Measured Value

Outbound ~ 6.5 Mbps

Return ~ 825 kbps

Committed Information Rate

(CIR)

Bandwidth On Demand (BoD)

Frequency Hopping

(Intended to improve BW

sharing)

Speech Quality

(MOS)

2.07

(Codec MOS is 4.1)

Round Trip Delay 988 – 1198 ms

Jitter Up to 183.9 ms

MOS near 2.0 is

considered Poor

Over 600 ms is

considered Poor

Over 50ms is

considered

Poor

39Comtech EF Data Proprietary & Confidential

This level of Jitter & Latency would degrade voice services while

making data services practically non-functional with throughput as

low as 100’s of bps to a few kbps

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Comtech EF Data CDM-800 Uživatelský manuál Strana 39