363-206-305
Circuit Pack Descriptions
Issue 3 June 2000
7-65
Notes
:
1. OLIU has two sets of optical interfaces.
2. OLIU is discontinued. Functionally equivalent alternatives are available or planned.
3. OLIU has extended TSI capabilities to support pass-through and hairpin cross-
connections for OC-1 rings terminated in function units of a DDM-2000 OC-3.
All OLIUs have universal optical connectors (compatible with ST, SC, and FC connectors)
unless specified otherwise.
All OLIUs operate at 1310 nm (nominal), except 29H-U.
All OLIUs have one optical transmitter and one optical receiver unless specified otherwise.
The “Span Length” column shows maximum span length for single mode fiber in controlled
environment, based on certain assumptions about loss budget. (See “Technical
Specifications,” Chapter 10.)
The “VT/STS Sig. Degrade PS” column indicates which OLIUs support VT1.5 path protection
switching based on signal degrade conditions on individual VT1.5 channels. These OLIUs
also support path protection switching based on STS signal degrade and VT unequipped
conditions.
The “TSI” column indicates what type of cross-connection (time slot interchange) capability is
supported by each OLIU.
The “Fiber Type” column indicates whether the OLIU is compatible with single-mode fiber,
multimode fiber, or both.
The “Ext. Atten.” column indicates whether an external attenuator is required for optical
loopbacks and short span lengths. “No” indicates none required. A dB value indicates the
minimum attenuation required.
The “System” column indicates whether the OLIU can be used in the DDM-2000 OC-3
system or FiberReach system.
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