363-206-285
Transmission and Synchronization Interfaces
5-14 Issue 3 June 2001
Fiber access is via four universal optical connectors on the faceplate: one transmit
and one receive for each of the two OC-1 ring interfaces (OC-1 line 1 and OC-1
line 2; OC-1 line 1 is the bottom pair). These connectors support
ST
â
, SC, and FC
type optical connectors. Single mode fiber is suggested for optimum performance;
multimode facilities are also supported. The 27-type OLIU photonics exceed the
span length requirements for SONET intermediate reach interfaces. The 27-type
OLIU optical interfaces are compatible with those of the 26-type OLIU, which is
used in the DDM-2000 FiberReach Wideband Shelf.
When used in the main shelf position, the 27-types can pass through signals on
the OC-1 rings, route signals between the OC-1 ring interfaces and interfaces in
the function unit slots, and route signals between function unit slots. When used in
the function unit shelf positions, the 27-type can route signals from the OC-1 ring
interfaces to the main slots. 27G2-U OLIUs route signals between OC-1
interfaces in the same or different function unit slots.
In DDM-2000 FiberReach host applications using the DDM-2000 OC-3
Multiplexer Group 1 or Group 3 shelves, the BBF5 jumper circuit pack is a passive
circuit pack that provides a method for connecting DCC related control signals
and transmission signals between slots in a function unit equipped with 27-type
OLIUs. The BBF5 circuit pack is not needed in Group 4 shelves. A single
BBF5 should be installed in Slot 8(P) of the low-speed group associated with the
function unit where the 27G-U OLIUs are equipped. A pair of BBF5 circuit packs
should be installed in slots 4 and 8 of the low-speed group associated with the
function unit where 27G2-U OLIUs are equipped.
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