Digital Link DL3800 DS1, Руководство пользователя

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Introduction
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S
YSTEM
O
VERVIEW
The DL3800 DS1 Inverse Multiplexer bridges the gap between T1 and T3
data services by providing T1 multiplexing of multimegabit (up to 12.224
Mbps) DTE data onto two to eight T1 circuits. The DL3800 Inverse
Multiplexer is an economical solution to bandwidth intensive applications
as it provides multimegabit data transport without the need for T3 circuits.
The DL3800 is an ideal solution for applications such as LAN-to-LAN
internetworking, bulk data transfer, video teleconferencing, and disaster
recovery.
Figure 2-1 DL3800 Inverse Multiplexer
The inverse multiplexing technique employed by the DL3800 is completely
transparent to the DTE application, as the multiple T1 circuits act as a
single high-speed data link. The DL3800 can accept up to a 31 milliseconds
differential delay between individual T1 circuits, thus providing the
capability to accommodate T1 circuits from divergent paths. This is often
the case with circuits being utilized from different carriers.
An excessive delay alarm will cause a T1 line to be taken out of service. If
the relative delay between all the T1 lines exceeds 31 milliseconds, then the
T1 lines are removed from service one port at a time until the remaining
group reside within the 31 milliseconds window. The Þrst port taken out of
service will be the one that is farthest away from the average value,
regardless of its relative delay value. In order to restore a T1 line, you must
use the manual restore command. In order to bring a T1 line back into