Marconi OMS 1200
Technical Product Description
221 02-ZAP 701 25/1 Rev C 2006-08-04
© Ericsson AB 2006
03PHB00004AAV-CUA
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The Communication Controller Unit (CCU) function is integrated into the design of the
core/CCU card and provides the message routing for the internal control interfaces
between the multiplexer controller, the network management ports and the other SMA
modules. It provides the Qx and embedded communications channel Qecc within the
SDH frame for central network-management control.
Application software is stored in non-volatile system memory, with an optional backup
to return to a previous version of software. System configuration and status data is
stored in non-volatile configuration database memory.
Software download is available to all cards, including the tributary modules, either
from the element manager or via the LCT.
The subrack provides two slots for core switch/line units. Equipping the Core
Switch/Line Unit A slot with an STM-4/16 core/CCU card provides a single line
interface for terminal applications only.
The addition of an STM-4/16 core card in the Core Switch/Line Unit B slot provides 1:1
equipment level protection for the core switch and timing/synchronisation functions
plus a second STM-4/16 line interface. This can be configured to provide one of the
following options:
•
1+1 linear MSP protection for a single network line interface in a terminal
application
•
Single Line-East and Line-West interfaces for ring applications with the
options of SNCP and 2-fibre MSSPRING protection schemes.
2.5.3
OMS 1240 64x2Mbit/s Core Tributary Card and LTUs
The OMS 1240 employs a single dedicated Core Tributary card to provide up to 64
channels of 2Mbit/s PDH traffic, with interface cable connection ports provided
exclusively by LTUs. The Core Tributary card provides the HDB3 line drivers and
receivers, permitting the LTUs to be simple cards providing only interface cable
connectors plus passive line termination.
Two Core Tributary slots are provided to enable the option of 1:1 Core Tributary card
protection. Both slots drive and receive the same set of HDB3 interface connections to
the LTUs.
The Core Tributary card has no on-board intelligence and is thus functionally
dependent upon the presence of a host Core card: Core A is the host for Core TRIB A
and Core B is the host for Core TRIB B. The minimum configuration for 2M PDH
operation with no protection requires the equipping of slots Core A and Core TRIB A
only. The “B” cards are only installed if protection of the Core and/or the Core
Tributary card is required, or if additional STM-1/4/16 ports are required.
Two versions of the Core Tributary card exist. In a system having a protected Core,
one can tolerate temporary removal of its host Core card without traffic loss, the other
cannot. This has implications where it is desired to protect the Core cards but not the
Core Tributary cards - see Section 7.2.1.1 for details.
Two slots are provided for OMS 1240 2M LTUs, each slot carrying 32 channels of 2M
traffic. Balanced and unbalanced LTU options are available, each type being a
composite module consisting of one SIU card plus a front panel providing either
2 x 78-pin high-density D-Type connectors (balanced) or 64 x 1.0/2.3 coaxial
connectors (unbalanced).
