3com MSR 20-20 사용자 설명서
FIC-2BSV/FIC-4BSV Module
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LC: square fiber-optic connector
MT-RJ: square fiber-optic transceiver connector
Connecting the Interface
Optical Fiber
Step 1: Insert the SFP card into its corresponding slot.
Step 2: Locate the Rx and Tx fiber-optic interfaces on the interface card. Use two
fibers to connect the FIC-CPOS to another device: Rx to Tx and Tx to Rx.
fibers to connect the FIC-CPOS to another device: Rx to Tx and Tx to Rx.
Step 3: Power on the device and read the state of the LINK LED for the CPOS
interface: ON means the Rx link is present and OFF means the opposite. In the
latter case, check the line status.
interface: ON means the Rx link is present and OFF means the opposite. In the
latter case, check the line status.
w
WARNING: Because invisible laser radiation may be emitted from the aperture of
an optical port when no fiber is connected or the dust cap is removed, do not
stare into the open aperture.
an optical port when no fiber is connected or the dust cap is removed, do not
stare into the open aperture.
Replace the dust cap when no fiber is connected to the optical port.
FIC-2BSV/FIC-4BSV
Module
Module
Introduction
The 2-port and 4-port ISDN BRI S/T voice interface cards (FIC-2BSV and FIC-4BSV)
can be used to process ISDN voice traffic. In the upstream direction, it can be
connected to user interfaces on an ISDN switch to receive and decompress,
compress and transmit ISDN BRI digital voice traffic. In the downstream direction,
it can be connected to TE devices to allow their voice traffic to be forwarded
through a WAN interface on the router to the Internet, thus implementing VoIP.
The interfaces on the FIC-2BSV/4BSV card are ITU-T I.430-compliant, adopting
pseudo-ternary coding, providing 192 Kbps rate, and allowing the maximum
transmission distance of 1 km (0.6 mi.) in point-to-point mode.
can be used to process ISDN voice traffic. In the upstream direction, it can be
connected to user interfaces on an ISDN switch to receive and decompress,
compress and transmit ISDN BRI digital voice traffic. In the downstream direction,
it can be connected to TE devices to allow their voice traffic to be forwarded
through a WAN interface on the router to the Internet, thus implementing VoIP.
The interfaces on the FIC-2BSV/4BSV card are ITU-T I.430-compliant, adopting
pseudo-ternary coding, providing 192 Kbps rate, and allowing the maximum
transmission distance of 1 km (0.6 mi.) in point-to-point mode.
The FIC-2BSV/FIC-4BSV has these features:
■
The BSV interfaces support two modes: user and network, respectively for
connecting an ISDN network and a TE device.
connecting an ISDN network and a TE device.
■
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 the FIC-2BSV/FIC-4BSV, where the traffic is
decompressed and sent to the TE device.
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 the FIC-2BSV/FIC-4BSV, where the traffic is
decompressed and sent to the TE device.
■
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 the FIC-2BSV/FIC-4BSV, where
the traffic is compressed and sent out of the BSV interface to the ISDN switch.
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 the FIC-2BSV/FIC-4BSV, where
the traffic is compressed and sent out of the BSV interface to the ISDN switch.
■
In conjunction with FXS or FXO analog voice interface modules, the card
provides flexibility in voice call routing.
provides flexibility in voice call routing.