Quick Eagle Networks DL3800E - Manual (Page 27)

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Introduction 2
S
YSTEM
O
VERVIEW
The DL3800E Inverse Multiplexer bridges the gap between E1 and E3 data
services by providing E1 multiplexing of multimegabit (up to Nx1.976
Mbps) DTE data onto two to eight E1 circuits. The DL3800E Inverse
Multiplexer is an economical solution to bandwidth intensive applications
as it provides multimegabit data transport without the need for E3 circuits.
The DL3800E unit is an ideal solution for applications such as LAN-to-
LAN internetworking, bulk data transfer, video teleconferencing, and
disaster recovery.
Figure 2-1 DL3800E Inverse Multiplexer
The inverse multiplexing technique employed by the DL3800E unit is
completely transparent to the DTE application, as the multiple E1 circuits
act as a single high-speed data link. The DL3800E unit can accept up to a
31-millisecond differential delay between individual E1 circuits, thus
providing the capability to accommodate E1 circuits from divergent paths.
This is often the case with circuits being utilized from different carriers.
An excessive delay alarm will cause an E1 line to be taken out of service. If
the relative delay between all the E1 lines exceeds 31 milliseconds, then the
E1 lines are removed from service one port at a time until the remaining
group reside within the 31-millisecond window. The first 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 an E1 line, you
must use the manual restore command. In order to bring an E1 line back
into service, execute the manual restore command on the remote unit first.
Then execute the manual restore command on the local unit. Auto restore
will not work for lines removed due to excessive delay.
The DL3800E unit supports either High Speed Serial Interface (HSSI) or
V.35/RS449/X.21 interfaces to the DTE.