363-206-285
Circuit Pack Descriptions
7-102 Issue 3 June 2001
Table 7-2. DDM-2000 OLIU Feature Summary (Contd)
Notes:
1. OLIU has
ST
®
connectors on faceplate.
2. OLIU has two sets of optical interfaces.
3. OLIU is discontinued. Functionally equivalent alternatives are available or planned: See
the next line in the table. See Chapter 10 for availability.
4. 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.
5. OLIU has 0 dB SC connectors installed and 0 dB ST connectors shipped loose.
6. 24G-U or higher OLIUs ship with SC connectors installed and ST connectors shipped
loose.
All OLIUs have universal optical connectors (compatible with
ST
, SC, and FC connectors)
unless specified otherwise.
All OLIUs operate at 1310 nm (nominal), except 24H-U and 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 Chapter 10 “Technical
Specifications” for details.)
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 the DDM-2000 OC-12 system, or both.
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