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Interface Card and Interface Module Manual
H3C MSR 20/30/50 Series Routers
Chapter 2 Smart Interface Cards
2-47
mode. In the upstream direction, the SIC-1BSV/SIC-2BSV card can be connected to a
user interface on an ISDN switch to receive and decompress, compress and transmit
ISDN BRI digital voice traffic. In the downstream direction, the card can be connected
to a TE device to forward the voice packets from the TE device to the Internet through a
WAN interface on the router, thus implementing VoIP. The card has the following
features.
z
A BSV interface supports two modes: user and network, respectively for
connecting an ISDN network and a TE device.
z
When a BSV interface works in network mode, traffic is processed as follows: The
digital voice traffic received on the BSV interface is compressed and forwarded
through the CPU on the main control board to a WAN interface. The IP voice traffic
received on a WAN interface is forwarded through the CPU on the main control
board to SIC-1BSV/SIC-2BSV, where the traffic is decompressed and sent to the
TE device.
z
When a BSV interface works in user mode, traffic is processed as follows: The
digital voice traffic received from the B channels on the BSV interface is
decompressed and forwarded through the CPU on the main control board to a
local FXS or FXO analog voice interface. The voice signals received on the local
FXS or FXO analog voice interface are processed by VoIP and forwarded through
the CPU on the main control board to SIC-1BSV/SIC-2BSV, where the traffic is
compressed and sent out of the BSV interface to the ISDN switch.
z
Working in conjunction with the FXS or FXO analog voice interface modules,
SIC-1BSV/SIC-2BSV provides flexibility in voice call routing.
z
The ISDN BRI D channel signaling is processed separately on CPU.
z
A BSV interface supports remote power supply and thus can be connected directly
to an ISDN phone, saving extra power supply device.
z
The SIC-1BSV/SIC-2BSV card is dedicated to voice applications, which is
different from the BS interface cards where BRI data applications are supported.
2.14.2 Interface Attributes
Table 2-31
Interface attributes of SIC-1BSV/SIC-2BSV
Attribute
SIC-1BSV
SIC-2BSV
Connector RJ45
Number of connectors
1
2
Interface standard
ITU-T I.430, Q.921, Q.931
Interface rate
192 Kbps
Cable
ISDN S interface cable
Supported service
Voice access over ISDN S interface cable