Calculation Example 4: Ip Networking Connections And Voice Over; Calculation Example 4: Ip Networking Connections And Voice Over Ppp (Isdn Routing) To Hipath 3750, Hipath 3700 - Siemens HiPath 3000 Service Manual

10.6.4.4.4 Calculation Example 4: IP Networking Connections and Voice over PPP
(ISDN Routing) to HiPath 3750, HiPath 3700
HiPath 3750 or HiPath 3700 (central systems) are connected to a second system (branch office
1) via ISDN routing with two PPP channels (S
direct LAN connection (IP networking channels).
Voice over PPP with Codec G.729 and a sample rate of 60 ms without encoding is used for the
ISDN routing connection to branch office 1. This means that six voice channels are supported
by the two PPP channels (S
connection to branch office 2. Codec G.729 with a sample rate of 20 msec without encryption
is used for this connection.
(6 + 8 =) 14 channels must be configured in the central offices, six channels in branch office 1
and eight channels in branch office 2.
An HXGM3 board without PDM module is sufficient for this configuration:
2 DSPs per HXGM3 = 2 DSPs, together supporting up to 16 channels.
Correspondingly, the total performance available is 980 points.
Performance requirement
The payload and the signaling load have to be taken into account when calculating perfor-
mance.
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 680.8 points is below the 980 total performance
points that the HXGM3 board can provide. The configuration is feasible.
P31003-H3550-S403-4-7620, 02/05
HiPath 3000 V5.0, HiPath 5000 V5.0, Service Manual
). Eight IP networking channels are sufficient for the IP networking
0
Function
14 x IP networking channel (25 calls per hour)
Voice gateway channel over LAN interface 1 without encryption:
8 x G.711 (received: 20 msec/sent: 20 msec)
Voice gateway channel routing over PPP:
6 x G.729 with packetizing of 3 (60 msec)
) and to a third system (branch office 2) via a
0
Total =
Workpoint Clients
IP Telephony (Voice over IP)
Resource require-
ment
(credit point)
14 x 3.2 = 44.8
8 x 39.0 = 312.0
6 x 54.0 = 324.0
680.8
wclient.fm
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