Specifications

2-48
Reference Guide
Model No.
Running Head
Low-Bit Rate Voice Server Applications
2.10.3 IP Routing Server Specifications
Up to three IP Routing server cards can be functional in an integrated access system in a
non-redundant configuration. The processor performance figure of 3500 packets/second was
obtained using 64 byte packets. The following hardware and firmware must be included in an
integrated access system to add IP Server operation:
•
8803 - CPU Control Card with 8 T1/E1 Cross Connect (redundant-capable)
•
8923/8924xx - 8 T1/E1 Interface card w/ 128K NVRAM
•
8811- Advanced Communication Server (ACS) with 3 WAN ports
•
60520 - Host Firmware version 5.2
•
67100 - IP Routing Server firmware
2.11 Low-Bit Rate Voice Server
The 8300
LBRV
(
L
ow
B
it
R
ate
V
oice) Server card allows for the compression of 64Kbps
digital voice channels into 8Kbps (plus overhead) digital sub-channels, and subsequently for
the sub-channels to be multiplexed over one, two or three composite Wide Area Network
(WAN) links. The LBRV Server can accept voice inputs from either analog voice ports (such
as FXS, FXO, E&M) or from T1/E1 WAN links through the integrated access system.
Each LBRV / ACELP voice compression server card supports up to three composite links at
speeds of 64k, 128k or 192k. The composite links are comprised of HDLC frames on one, two
or three time slots. Users assign voice channels to one, two or three links based on the need to
switch those channels separately through the network. The composite links can be routed
directly to WAN cards or to the Frame Relay Server. When routed to a Frame Relay Server
(FRS), the FRS provides a FRAD function for the compressed voice frames. No Frame Relay
sub-addressing is supported, so all voice channels within each composite link from the
ACELP will be treated as a single PVC.
In a single integrated access system, there are 32 voice ports which can be compressed but is
dependent on whether the voice channels originate on analog cards, or a total of 64 ports can
be compressed on WAN time slots.
The LBRV card performs DTMF recognition and re-construction. This means the integrity of
DTMF does not suffer from the compression/decompression processes. The LBRV card does
not support MF signaling between switches. The following is a list of the LBRV key benefits:
•
Simple topologies including Point-to-point, Star, Mesh.
•
LBRV performs a compression and transport function. It does NOT perform voice
switching and call-routing.
•
High density of channels and high volume of traffic.
•
LBRV solution is competitive with high volumes of traffic. There should be many (24+)
voice channels in one location.