3com MSR 20-20 사용자 설명서
190
C
HAPTER
4: F
LEXIBLE
I
NTERFACE
C
ARDS
Interface Optical Fiber
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WARNING: Laser danger: Invisible laser radiation may be emitted from the
fiber-optic ports which are connected with lasers. To protect your eyes against
radiation harm, never stare into an open fiber-optic port.
fiber-optic ports which are connected with lasers. To protect your eyes against
radiation harm, never stare into an open fiber-optic port.
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CAUTION: The FIC-1ATM-OC3SML provides a long-haul fiber interface. It requires
transmission distance at least longer than 25 km (15.5 in.); otherwise, the
interface cannot receive signals.
transmission distance at least longer than 25 km (15.5 in.); otherwise, the
interface cannot receive signals.
The FIC-1ATM-OC3MM must be connected using the multi-mode optical fiber
whereas the FIC-1ATM-OC3SM/ FIC-1ATM-OC3SML must be connected using the
single-mode optical fiber.
whereas the FIC-1ATM-OC3SM/ FIC-1ATM-OC3SML must be connected using the
single-mode optical fiber.
FIC-1G.SHDSL
Introduction
FIC-1G.SHDSL, the 1-port single-pair high-speed digital subscriber line card, uses
trellis coded pulse amplitude modulation (TCPAM) for coding and provides the
symmetric rates up to 2.3 Mbps. Its transmission speed can automatically adapt to
cable length and conditions.
trellis coded pulse amplitude modulation (TCPAM) for coding and provides the
symmetric rates up to 2.3 Mbps. Its transmission speed can automatically adapt to
cable length and conditions.
Compared with ADSL, G.SHDSL allows longer transmission segment and as such,
can serve a wider range of applications. It can substitute for E1/T1 lines to provide
high-speed data service access. However, as TCPAM uses the band starting from 0
Hz for data transmission, G.SHDSL cannot share the same line with POTS or ISDN
just like what ADSL has done.
can serve a wider range of applications. It can substitute for E1/T1 lines to provide
high-speed data service access. However, as TCPAM uses the band starting from 0
Hz for data transmission, G.SHDSL cannot share the same line with POTS or ISDN
just like what ADSL has done.
The FIC-1G.SHDSL supports:
■
Manual G.SHDSL line activation/deactivation and easy-to-use fault location
tools.
tools.
■
G.992.1-compliant interface and auto-sensing.
Interface Attributes
The following table describes the interface attributes of the FIC-1G.SHDSL.
ACT
OFF means no data is being
transmitted or received on the
interface and blinking means data is
being transmitted and/or received.
transmitted or received on the
interface and blinking means data is
being transmitted and/or received.
Table 134 LEDs on the ATM card panels
LED Description
Table 135 Interface attributes of the FIC-1G.SHDSL
Attribute FIC-1G.SHDSL
Connector RJ-11
Number of connectors
1
Interface standard
G.991.2