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Circuit Pack Descriptions
Issue 1 December 1997 7-13
General Description of Operation 7
The OHCTL circuit pack provides the following basic functions:
■ Data Communications Channel (DCC)
■ X.25 message-based OS interface
■ IntrAOffice Local Area Network (IAO LAN) interface.
Detailed Description of Operation 7
OC-12 Transport Overhead Channel 7
Figure 7-6 provides an overall block diagram of the OHCTL circuit pack.
The OHCTL terminates an overhead channel from each main and function unit
slot. The overhead channel includes a 192 kb per section DCC (SONET bytes
D1-D3) and a 64-kb/s order wire channel (SONET byte E1).
User Definable Miscellaneous Discrete Environmental Alarms and
Controls 7
The system provides four miscellaneous discrete control outputs and 21
miscellaneous discrete alarm/status inputs when the DDM-2000 OC-12 is
configured as an RT. For this application, the SYSCTL supplies all of the
necessary miscellaneous discrete I/O. Alarms are reported via CIT or TL1/X.25.
Controls are also via the CIT or TL1/X.25.
X.25 Message-Based Operation Interface 7
The OHCTL provides the TL1/X.25 interface to Bellcore Network Monitoring and
Analysis (NMA) operations system (OS).
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