3Com 3C13701, Руководство по установке

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ADSL MIMM 53
Figure 59 1-Port Channelized T3 Panel
Table 48 1-Port Channelized T3 LEDs
ADSL MIMM
The 1/2 ADSL (1-Port/2-Port Asymmetric Digital Subscriber’s Loop) modules are
available for 3Com 5000 Routers. The ADSL interface modules provide the users
with telephone interfaces equivalent to WAN interfaces, which can enable a LAN
subscriber to reach the DSLAM (Digital Subscriber's Loop Access Multiplexer) of
the service provider through an analog subscriber line, and then access the ATM/IP
backbone network or Internet. Thus, high-speed data communications and video
on demand can be fulfilled. As ADSL uses the high frequency band upper than 26
KHz for data transmission, its activities will not interfere the voice service (which
occupies the low frequency band in the range of 0 to 4 KHz) implemented across
the same line. Normally, the subscriber can be provided with a speed in the range
of 32 Kbps to 8 Mbps (downstream rate) and a speed in the range of 32 Kbps to 1
Mbps in the (upstream rate).
The primary function of ADSL module in a system is to provide ADSL interface for
the router, which includes,
■
Allows manual activation/deactivation of ADSL line, and supports four SAR
loopback methods that facilitate the fault isolation.
■
Supports interface standards of G. DMT, G. Lite, and T1.413 and the
configuration of auto-sensing.
■
Supports network lattice coding (except for the G. Lite standard) on ADSL
interfaces for enhancing the stability of ADSL connections.
LED Meaning
LINK OFF means that the link is not set up
and ON means that the link has been
set up.
ACT OFF means that no data is being
transmitted or received, and blinking
means that data is being transmitted
and received.