• Unique design for Master and Expansion shelves
• Entirely new family of SSU with 3U and 6U 19” shelves, or 6U and 12U ETSI shelves
• Adapts to all telecom node sizes, from a few 10’s up to 1000’s of synchronisation outputs
• Intuitive and modular architecture (protection groups, visual display of selected channels)
• Extremely compact: up to 200 protected (1:1) outputs in a 6U 19” or 12U ETSI shelf

• Single System (Master and 4 expansions) allows up to 1000 protected outputs
• G.811 PRC with optional GPS card(s)
• G.812 Type I or II or III SSU holdovers
• Universal output & input card design
• SSM on complete system (Master & Expansion)
• Manageable with intuitive Local and Remote Graphical User Interface
• Up to 80 re-timing channels
• Optional NTP and IRIG-B output modules

Introduction
The OSA 5548C Synchronisation Supply Unit (SSU) is the latest breakthrough from Oscilloquartz, a pioneer in synchronisation of SDH/SONET and mobile networks. It is designed to provide telecom operators with reliable synchronisation, using the latest in hardware and software technologies. The 5548C system provides a scalable synchronisation solution ranging from 20 unprotected up to thousands of 1:1protected outputs.

Unparalleled flexibility
The 5548C can be a redundant G.811 PRC source if you decide to include one of two possible GPS cards (this does not change the number of inputs or outputs available).

In addition to E1 and 2.048 MHz output cards, any of the 10 main output slots can be equipped with time distribution modules (NTP or IRIG-B) or with E1 re-timing cards.

With its complete and consistent family (6U ETSI: 200 outputs, 3U/6U ETSI: 60 outputs, expansions, ... ), the 5548C is the SSU of choice when you need scalability and reduced spare parts inventory. This flexibility makes the 5548C the most versatile SSU in the marketplace.

Extreme Compactness
Each card is only 100 mm tall, contributing to a higher overall port/volume ratio, and therefore reducing the size of the 5548C shelf design to accommodate overcrowded Telecom Hub Rooms and Switching Center rack spaces.

High Availability
All cards are intelligent and communicate with each other to implement a distributed intelligence message passing system. This approach ensures absence of single points of failure and reliable uptime.

Inputs
The OSA 5548C SSU uses a universal Input Card (INC) designed to reduce spare counts. Each Input card can accept up to four signals and can be 1:1 protected with an adjacent identical “B” card. Two input groups (therefore four slots) are available for Input Cards, giving flexibility from 4 unprotected inputs (one card) to 8 protected inputs (4 cards).

GPS Modules*
In addition to line input card, one or two GPS input cards can be fitted to meet G.811 requirements without the need of installing and managing external receiver(s) or Cesium clock. This allows the simplification of the sync plan by flattening the sync distribution hierarchy and results in a reduction of the overall provisioning, operating and maintenance costs.

The presence of a GPS input also gives access to precise time information that can be distributed via NTP or IRIG-B. Additionally, 5548C can accept any external GPS reference as one on the input Line of the INC.

Input Selection
The active reference input is selected among the set of eligible input signals based on one of the following criteria:

• Priority table
• SSM value
• Performance Threshold mask
• User selection

Tracking & Holdover
This card forms the beating heart of the OSA 5548C SSU.
The input reference jitter and wander are filtered by a high quality oscillator with DDS technology.

• Rubidium (Rb)
• Double Oven Quartz (OCXO)

Pass-through
In the extreme case of total failure of both oscillator cards or if they are pulled out, the pass-through feature of the 5548C SSU allows to still keep the office alive. In this case synchronization is obtained from one input reference of the first INC’s group and distributed without filtering to the INC’s output section.

Outputs
The 5548C SSU uses a universal Output Card of 20 outputs that are sofftware configurable ( 20 E1, 2.048 MHz or 10 E1 & 10 2.048MHz). Output cards slots are, like all the other functionalities on this SSU, separated in intuitive A and B groups (adjacent cards slot).

The 5548C SSU-E200 counts 10 groups of outputs, giving you the flexibility from 20 unprotected outputs to 200 protected outputs on one shelf (and the flexibility of having some outputs protected and some unprotected).

The 5548C SSU provides maximum flexibility towards different interconnection requirements with its wide choice of modular tile sets.

Performance Measurement
All active inputs are constantly measured against the current output reference with 1ns resolution. The local processing of performance data presents the data in a way that reduces network overhead for remote retrieval. The computed MTIE and TDEV curves are used internally for the input selection compared to standard masks to raise alarms if the curves are out of limits sent to the management station(s) for display, user validation , and storage.

Time Code Card - NTP
Time Output cards allow precise time distribution when at least one GPS card is installed. This is a major advantage compared to having to additionally install and manage an external receiver with its GPS antenna and cabling. The Ti9me Code Card - NTP provides full NTP time server functionality on a separate 10 BaseT RJ-45 connector. Time output cards can be fitted into any main output card slot.

Click here to download the NTP card datasheet.

Re-Timing*
Each re-timing card provides 8 E1 re-timing channels and the card occupies only one output card slot. Configurable alarm thresholds can be set via management software in terms of slips per hour/day/week. This allows continuous monitoring and immediate detection of synchronization problems on the incoming traffic signals and results in a higher Quality of Service.

Expansion or remote shelves*
Up to 4 expansion shelves can be chained to the main shelf for a total of 1000 outputs, optionally protected 1:1. Chaining of the expansion shelves is redundant in order to ensure maximum reliability.

Management
The management card provides connectivity with local and remote synchronization management systems via a TL1 interface over RS-232 (local) and TCP/IP (remote). OSA Local Manager and SyncView Next Generation Management software provide, locally and remotely, powerful fault, configuration, accounting/inventory, performance and security management functions through an intuitive graphical user interface. Local alarm information is provided as:

• Internal buzzer (audible)
• Relay contacts (electrical)
• Status LED’s on front panel (visual)

Third party equipment can easily be managed through a set of 10 electrical alarm collection inputs; a specific user-configurable alarm message can be associated to each alarm input. As a future option, the 5548C will also be manageable directly by SNMP with embedded agent.

Simplified Maintenance
SSU and Expansion Shelves share the same cards; this reduces homologation activity, stock of spare parts as well as overall administrative complexity and results in reduced cost of ownership. All cards are easily reprogrammable via a simple software download and managed via a global shelf release.