Specifications

3000sb3.fm
P31003-H3560-X100-1-7618, 09/05
HiPath 3000/5000 V6.0, System Description
3-13
For internal use only
HiPath 5000 System Overview
Server Networking
Accordingly, the minimum bandwidth required is as follows:
The necessary bandwidth must be calculated using N as the number of simultaneous connec-
tions:
N = number of simultaneous voice connections
When configuring fax or modem transmissions using the formula described above (outband
transmission) the following are also required for each configured connection
● approximately 20 Kbps for a fax Gr. 3 (V.17, 14 Kbps) connection
● approximately 40 Kbps for modem connections (V.34, 33.6 Kbps).
for each configured connection
3.4.2.3 Requirements of Delay Times
For natural communication, the delay should amount to a maximum of 50 ms (one-way delay)
for voice connections (network delay). Delays of more than 50 ms in one direction impair natural
communication. The effect is similar to that experienced with voice connections over satellite.
The maximum number of 15 buffer stations (HOPs) may not be exceeded.
Priority control is a particularly efficient means of reducing the delay (see next section). Please
proceed with caution if the network is operated using lines with a low bit rate (for example, con-
nection of a branch to headquarters at a rate of 128 Kbps). The maximum number of trunk lines
can be determined by calculating the necessary bandwidth.
3.4.2.4 Provision of QoS in Data Networks
To guarantee the Quality of Service (QoS) described in the two previous sections, the following
standards must be met:
● All the components involved in transmitting voice data must support min. IEEE 802.1q (lay-
er 2).
● In addition, all components require routing according to the Diffserv standard RFC 2474
and the ToS standard (Type of Service) RFC 791.
Required bandwidth Formula (Kbps) of approximate values
With ITU G.711 .. N x 90 (voice)
+ N x 4 (BLF+CDR)
+ 10 (ACD/TAPI)
With ITU G723.1 .. N x 22 or 19 (voice)
+ N x 4 (BLF+CDR)
+ 10 (ACD/TAPI)