Specifications

hg-09.fm
A31003-H3580-M103-2-76A9, 01-2009
HiPath 3000/5000 V8 - HG 1500 V8, Administrator Documentation
9-7
Nur für den internen Gebrauch
Technical Concepts
Bandwidth Requirements in LAN/WAN Environments
The following table contains information on additional bandwidth requirements for signals:
Bandwidth requirements in LAN environments with encryption
Encryption requires increased bandwidth. The following tables list the bandwidth requirements
depending on the possible voice codecs and encryption algorithms for Ethernet packets. En-
cryption is performed by an IPsec protocol stack. Only one of the many operating modes avail-
able for IPsec is considered here: the ESP tunnel mode with authentication.
This operation mode offers the highest level of security for site-to-site VPNs.
Device/application BHCA Load (Kbps)
DSS server, outgoing and incoming calls 1400 2
Attendant P (busy) 1400 3
Call charge information 1400 1
ACD information 1400 10
Fax over VCAPI, 14400 bauds 2
CDB synchronization system with DBFS (TFTP, burst) 162
Table 9-8 Bandwidth Requirements for Signals
Protocol Bytes Encrypted?
ESP Trailer 12
ICMP Padding varies (y) encrypted
ICMP Padding Header 2 encrypted
Voice Payload varies (x) encrypted
RTP 12 encrypted
UDP 8 encrypted
IP (original) 20 encrypted
ESP Header 8 + IV
*
* IV = initializing vector. For an explanation see the text below the table
IP (Tunnel) 20
802.1Q VLAN tagging 4
MAC (incl. preamble, FCS) 26
Total 112 + IV + x + y
Table 9-9 Structure of an encrypted voice packet
(ESP tunnel mode with authentication)