Vocality User Manual
User Manual for V200
Valid for V08_08.02 or V08_48.02
Page 77 of 114
5.13.5 Bandwidth calculations
The required bandwidth is dependant on several factors, which you are able to change.
The values presented here are for reference only.
The 'Mux Delay' parameter specifies how long the system holds on to a packet destined
for the IP aggregate, in milliseconds. If another packet destined for the same IP
aggregate arrives within this period then it is tagged on to the existing packet, thus
reducing overheads.
As long as the total Vocality payload will fit into the UDP payload, then the following
rule of thumb may be used:
where:
The following table contains bandwidth requirements based on the above. The caveat
still exists: By use of a buffer, the network access device will be expected to handle any
instantaneous IP packet throughput that momentarily exceeds the CIR.
Codec
Mux Delay
No. Tribs
BW kbps
No. Tribs
BW kbps
G.723.1 (5.3k)
20
1
19.1
2
25.5
G.723.1 (6.3k)
20
1
20.2
2
27.6
G.729A (8k)
20
1
22.4
2
32.0
Netcode (8k)
20
1
22.4
2
32.0
Netcode (9.6k)
20
1
24.0
2
35.2
Table 5-2 Approximate bandwidth requirements
For real networks, a particular configuration may have an impact on the values actually
achieved.
5.14 Setting up clocking for serial ports
Setting up clocking correctly is essential if you are using serial ports. Serial ports are
available on all of the Vocality Professional range products, BASICS Hybrid,
BASICS IP Serial and BASICS IP PC104, when the optional serial card has been fitted.
If the clocking is not set up correctly you may notice reading of data becoming
unreliable at higher speeds, or even as the equipment warms up. Clocking problems can
be difficult to troubleshoot because it is possible for equipment with an inappropriate
clocking set up to appear to work perfectly for a short time, or in limited conditions. It
