Calculation Example 6: Connecting Teleworkers Via Vpn - Siemens HiPath 5000 Service Manual

2.6.8.1.6

Calculation Example 6: Connecting teleworkers via VPN

Eight teleworkers should be connected to HiPath 3750 or HiPath 3700. G.723 with a sample
rate of 30 msec is required. In addition duplex data transmission with 512 Kbps is also to be
enabled via the 2 Mbps SDSL port connected to LAN interface 2. The average packet size is
500 bytes. VPN should be used with AES encryption.
HXGM3 board is required for this configuration:
2 DSPs per HXGM3 = 2 DSPs, which together support up to 16 channels.
Correspondingly, the total performance available is 980 points.
Performance requirement
Calculation of the dynamic performance requirement for the SDSL connection based on the re-
quired data exchange rate (512 kbps = (512 X 1000)/8 bps = 64000 bps per route). The follow-
ing formula applies for 500 byte packet length:
64000 bps
500 bytes/packet
Since VPN functionality is required, the WBM setting "Enhanced B Channels" is deactivated.
Data transfer (addi-
tional feature: En-
hanced B Channels
Disabled over WBM.)
Signaling without
H.235 security (inde-
pendent of the WBM
setting "Enhanced B
Channels")
Payload (additional
feature: Enhanced B
Channels Disabled
over WBM.)
The specified performance requirement of 788.72 points is below the 980 total performance
points that the HXGM3 board can provide. The configuration is feasible.
P31003-H3560-S403-54-7620, 09/05
HiPath 3000 V6.0, HiPath 5000 V6.0, Provisional Service Manual
= 128 packets/route = 256 packets/s for both routes
Function
SDSL connection (with AES encryption and 500 bytes packet length,
performance requirement (score) = 119 for 100 packets/sec):
256 packets/sec
8 x IP workpoint client: System Client, HFA
client, H.323 client (eight calls an hour)
Voice gateway channel over LAN interface 2 with encryption:
8 x G.723 (received: 30 msec/sent: 30 msec)
with AES encryption
System Data
Dynamic Configuration Rules
Resource require-
ment
(credit point)
256 x (119 / 100) =
304.64
8 x 0.51 = 4.08
8 x 60.0 = 480.0
Total = 788.72
sysdat.fm
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