Control, Transmission, and Synchronization Interfaces
5-4 Issue 8.0 July 2002
functions. For more information about the operations, administration,
maintenance, and provisioning functions, refer to Volume I, Section 6 (“Operations
Interfaces”); Volume I, Section 8 (“Administration and Provisioning”); and
Volume I, Section 9 (“Maintenance Description”).
The Overhead Controller - Terminal [OHCTL (TERM)] circuit pack performs
synchronous optical network (SONET) overhead access and processing
functions. The OHCTL (TERM) circuit pack processes OC-48 section and line
data communications channel (DCC) information and supports line and section
orderwire (local and express orderwire, bytes E1 and E2), the user channel (F1),
and the growth bytes (Z1, Z2). For more information about the overhead bytes,
refer to Appendix A, "A SONET Overview."
In Release 6 and later releases, the Overhead Controller - Tributary (TOHCTL)
circuit pack also performs SONET overhead access and processing functions at
FT-2000 OC-48 Add/Drop-Rings Terminals. The TOHCTL circuit pack processes
(OC-3/OC-12) section DCC information (bytes D1-D3).
In Release 6 and later releases, the Orderwire (OW) circuit pack performs SONET
section overhead access functions at FT-2000 OC-48 Repeater Bays. The OW
circuit pack provides access to the OC-48 section orderwire (E1) and user
channel (F1) bytes.
The controllers within the control architecture communicate among the different
hierarchical levels using internal local area networks (LANs). The board
controllers and the LNCTL circuit pack of the same line communicate using the
board controller local area network (BCLAN). The LNCTL circuit packs and the
system controller complex communicate using the line controller local area
network (LCLAN). The OHCTL (TERM) circuit packs, TOHCTL circuit pack, and
system controller complex communicate using the overhead access local area
network (OALAN). The OW circuit pack does not communicate with other
controllers in the control architecture.
The FT-2000 OC-48 Lightwave System's extensive control features are available
through several craft and operations system (OS) interfaces. In addition to
accessing the local terminal, the craft and OS interfaces can reach a remote
terminal using the data communications channel in the OC-48 signal. In Release
6 and later releases, craft and OS interfaces can reach remote terminals and
DDM-2000 Multiplexers using the OC-3 data communications channel. These
functions are provided by the SYSCTL, SYSMEM, LNCTL, OHCTL, TOHCTL,
and OW circuit packs. For more information about craft and operations system
interfaces, refer to Volume I, Section 6, “Operations Interfaces.”
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