Voice Test
In testing the 3845, I focused on the promise of converged voice and data with on-board packet voice DSP (Digital Signal Processing) modules. The unit didn't let me down.
To replicate various central and branch-office setups, I connected the 3845 and the 2821 over Gigabit, 100Base-T, and simulated T1 and T3 links. Then I generated random HTTP and FTP traffic between the routers, using 5 percent to 10 percent of the available bandwidth.
With Spirent's Abacus 5000 Call Generator, Simulator and Analysis Tool for Convergence, I simulated up to 180 simultaneous calls (three to four calls per second). I rated call quality with the PSQM (Perceptual Speech Quality Measurement) and MOS (Mean Opinion Score) tests.
With the help of the Abacus software (version 2.6), I ran 15-minute tests simulating channels or calls using H.323 circuits, with a G711 u-law codec using 64 to 80 Kbps per call. Each 30- to 60-second call passed artificial voice records based on the ITU-T P861 standard. I received path confirmation for each successful call.
Discover the benefits of scalable backbone and network services for application and cloud providers.
Network automation is gaining momentum. Here's how you can drive this powerful technology to its full potential.
Subsea cable alternatives can provide a level of comfort for those concerned about disruptions. Realistically, they will continue to play a small, but critical role in the short term.
