Service manual

OpenScape Business V1
Sales Information Page 66 04.06.2013
Packet Loss 3 %
For fax or modem transmissions
using G.711, the packet loss
should not exceed 0.05% (in the
event that no T.38 is possible)
Consecutive Packet Loss 3 with G.711
Higher values degrade the
voice quality
1.9.1.2 Recommendation for Calculating Bandwidth
– A bandwidth of at least 256 kbps (in both the sending and receiving direction) is required on
the internetwork.
– The bandwidth calculation should be based on a maximum of 50% for the voice portion with
respect to the total bandwidth. In other words, in the case of a 1 Mbit WAN, for example, a
maximum of 500 kbps should be calculated for voice. With the G.711 codec, for example, that
would be a maximum of 5 IP trunks.
– Regardless thereof, the network properties with respect to QoS, delay, packet loss, etc., must
also be taken into account.
1.9.1.3 Requirements for the LAN
To ensure the quality of the voice and data transmissions, the IP networks being used and the
communication system must meet certain requirements for the LAN.
LAN Requirements
– The data network must be of the Ethernet type.
– The recommended cable is at least a Cat.5 cable (screened/unscreened multi-element cables
characterized for 100 MHz and higher for horizontal and building backbone cables as per EN
50288).
– Support for QoS: IEEE. 802.1p, DiffServ (RFC 2474).
– All active LAN ports must support 100/1000 Mbps and full duplex communications.
1.9.1.4 Requirements for the WAN
To ensure the quality of the voice and data transmission, the IP networks being used and the
communication system must meet certain requirements for the WAN.
WAN Requirements
– The internal IP networks (LANs) must each be connected to the Internet via a WAN port with a
fixed IP address.
– The bandwidth required for the calls must always be available for both uploads and
downloads.
– The number of simultaneous WAN-based IP phone connections is limited by the bandwidth
and the audio codecs used.
– No modem is integrated at the WAN port of the OpenScape Business, so an external modem
may be required (e.g., a DSL modem or cable modem).
– Voice quality restrictions can occur at ports that are not QoS-compliant (generally, ADSL
ports).
– An external router must provide QoS features and bandwidth control mechanisms to ensure
the voice quality
1.9.2 Networking Scenarios
There are essentially six scenarios for setting up a new internetwork and three scenarios for
upgrading an existing internetwork.
– Networking Multiple OpenScape Business X3/X5/X8 Systems
– Networking OpenScape Business and OpenScape Business S (Single Gateway)
– Networking OpenScape Business and OpenScape Business S (Single Gateway)
– Networking OpenScape Business and HiPath 4000
– Networking OpenScape Business and OpenScape Voice
– Networking OpenScape Business with other communication systems
Call charge details can only be retrieved per network node, but not across nodes.