PORT PROCESSORS/MODULES
940043-002
INTEGRATED ENTERPRISE NETWORK
3-41
DVF18
The DVF08/18 module is a voice compression module that compresses and packetizes up
to eight 64K PCM voice channels to 6.2 or 13.3Kbps data. The compressed voice channels
can be transmitted with legacy and LAN data over a WAN connections, such as frame relay.
The DVF08/18 module comes in three versions capable of compressing two, four or eight
channels:
n
DVF08-02
(Part #030182-001)
Two voice channels
n
DVF08-04
(Part #030182-002)
Four voice channels
n
DVF08-08
(Part #030182-003)
Eight voice channels
n
DVF18-02
(Part #TBD)
Two voice channels
n
DVF18-04
(Part #TBD)
Four voice channels
n
DVF18-08
(Part #TBD)
Eight voice channels
Each version is capable of supporting one fax transmission at a time on any of the voice
channels. When a fax transmission is detected on a voice channel, it is shifted to the
on-board fax controller for completion. Fax support includes Group 111 up to 9.6Kbps.
The DVF08/18 module is a two, four, or eight channel plug-in that provides voice
compression for the CID61 port processor. The DVF08/18 module plugs into the J1, J3,
and J2 sockets of the CID61 port processor. In a node requiring only eight voice channels,
the DVF08/18 module can be placed on the WAN interface. Configurations requiring more
than eight voice channels are configured with each DVF08/18 residing on its own CID61
port processor.
The DVF08/18 uses a vocoder for each channel which is capable of variable data rates
using QUALCOMM Codebook Exited Linear Predictive (QCELP) speech coding algorithm.
The variable rates are 13.3Kbps or 6.2Kbps which automatically adjusts from 1Kbps to
6.2Kbps or 13.3Kbps. Each vocoder has its own integrated echo canceller which meets
CCITT Recommendation G.165.
When planning WAN bandwidth requirements, enough bandwidth should be planned to
provide for each channel when active. For example, each channel should have its
maximum bandwidth, such as 6.2Kbps, plus 2.0Kbps for routing overhead available. An
example would be a site with four voice lines setup to be compressed at 6.2Kbps and their
overhead. The requirement would be 4 x lines (6.2Kbps + 2.0Kbps) = 32800bps. In a
frame relay environment, the committed information rate (CIR) would require to be greater
than the aggregate of the voice channel requirements.
Summary of Contents for IEN 1000
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