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76 CHAPTER 8: FLEXIBLE INTERFACE CARDS
Figure 19 1-port OC-3 ATM SML
The following table describes the LEDs on the card panels.
Table 15 LED description of the ATM cards
Interface Optical Fiber 1-port OC-3 ATM MM uses multi-mode optical fibers and 1-port OC-3 ATM SM,
1-port OC-3 ATM SML use single-mode optical fibers. As all these three interface
cards adopt SC optical fiber connectors, the connectors of the optical fibers must
also be SC connectors. The external optical cable suite provides the users with
optical cables of variable lengths. For the connector appearance, optical cable
connection and the safety precautions, refer to the section 8.5.5 Connect
Interface Optical Fiber.
CAUTION: Laser Danger! Do not stare at the optical fiber connector connected
with the laser in case the invisible laser radiation harms your eyes.
1-port OC-3 ATM SML adopts long-distance fiber interface, requiring a
transmission at least longer than 25km. If the transmission distance is lower than
25km, the interface will be unable to receive signals.
1-port OC-3 ATM MM should be connected with multi-mode optical fibers
whereas 1-port OC-3 ATM SM / 1-port OC-3 ATM SML should be connected with
single-mode optical fibers.
2-port ADSL (over
POTS) FIC (3C13872)
ADSL (Asymmetric Digital Subscriber’s Loop) interface card (2-port ADSL FIC)
provide the users with the telephone line-based ADSL access that allow a LAN
subscriber to reach the DSLAM (Digital Subscriber's Loop Access Multiplexer) of
the exchange office through a regular analog subscriber line, and then access the
ATM/IP backbone or Internet. Thus, high-speed data communications and Video
on Demand (VoD) can be fulfilled. As ADSL uses the High Frequency (HF) band
higher than 26 KHz for data transmission, its activities will not interfere the voice
service (which occupies the Low Frequency (LF) band in the range of 0 to 4 KHz)
implemented over the same line. Normally, the subscriber can be provided with a
LINK
OFF means the link is not connected and ON means the link is
connected.
ACT
OFF means no data is being transceived on the interface and blinking
means data is being transceived.