363-206-285
Transmission and Synchronization Interfaces
5-10 Issue 3 June 2001
Figure 5-6 is a block diagram of the DDM-2000 OC-3 Multiplexer serving as a
DDM-2000 FiberReach host. Dual OC-1 interfaces provided by the 27-type OLIU
can be equipped in the function unit slots to support single-homing and dual-
homing applications.
Figure 5-6 shows a single-homing arrangement with six 27-type OLIUs in the
function unit slots. Each OLIU supports one leg (transmit and receive) of two
independent OC-1 rings for a total termination capacity of six OC-1s. Each OC-1
has the capacity of up to 28 VT1.5s. Enhanced routing hairpin connections
between OC-1 rings terminating on function unit slots do not consume bandwidth
on the ring supported by the OLIUs in the main unit slots. This increases the total
capacity of the shelf beyond the 84 VT1.5s supported by the main unit OLIUs.
The 27-type OLIU circuit pack interfaces between two 1310 nm OC-1 optical lines
in the transmit and receive directions. It can be used in the main and/or function
unit slots of the DDM-2000 OC-3 Multiplexer. Each pair of 27-type OLIUs supports
up to two independent OC-1 ring interfaces on a DDM-2000 OC-3 Multiplexer
(see Figure 5-8). To support dual homing applications, one 27-type of a pair can
be installed in one DDM-2000 OC-3 shelf and the other can be installed in another
DDM-2000 OC-3 shelf on the same ring.
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