Siemens HiPath 3000 Series - VPN Networking with Data and Voice Connections

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A31003-H3590-S100-7-7620, 06/2012
HiPath 3000/5000 V9, Service documentation
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Dynamic Configuration Rules
2.5.4.2.6 VPN Networking with Data and Voice Connections
A 1000 Kbps duplex data connection between 2 HiPath 3800 systems should be configured via
a 2 Mbps SDSL interface. The average packet size should be 500 bytes. The SDSL connection
should also be used for trunk connections with G.729 and a sample rate of 20ms. The SDSL
line is connected to LAN2. The maximum possible number of additional IP trunking channels
with G.729 should be calculated.
Figure 2-13 VPN Networking
Performance calculation:
The required data traffic performance must first be determined. The upstream and downstream
packet rates must therefore first be calculated from the average packet length.
With a permissible maximum points total of 980, this leaves 980-596=384 points for IP trunking
channels. For each IP trunking channel, one PBX networking channel and one gateway chan-
nel with VPN and AES is required. In other words, 3.2+89=92.2 points are required per trunking
channel. If the remaining points are divided by the number of points per channel and rounded
off, this results in 384/92.2=4 channels.
Table 2-55 Performance Calculation (1)
Function Formula Points
Data (LAN): VPN and AES with 500 bytes upstream 250 · 1.19 298
Data (LAN): VPN and AES with 500 bytes downstream 250 · 1.19 298
Total 596
HiPath 3800
LAN 2
LAN 1
Head Office
ISDN
1000 kbit/s Data
Internet
4 Voice PBX/Networking Chan-
nels
AES Encryption
SDSL
2 Mbit/s
Encrypted Intranet Traffic
(Voice) via VPN Tunnel
HiPath 3000
LAN 1
LAN 2
Branch Office
Intranet
1000 · 1000 / 8 byte/s
500 bytes/packet
= 250 packets/s
1000 · 1000 / 8 byte/s
500 bytes/packet
= 250 packets/s