• Two retiming channels
• Two frequency outputs (2.048 MHz)
• Two frequency input reference (2.048 MHz)
• High frequency stability allowed by the use of high performances OCXOs (high loop time constant)

• Less than 1x10 -10 / 24 hrs holdover frequency accuracy
• Low power consumption
• Expected life time greater than 20 years
• Low cost effective solution
• RS-232C local management

Co-existence of data and voice traffic, and emergence of sophisticated mobile networks, almost always requires some form of equipment synchronization. In today's de-regulated telecom environment, synchronization distribution is a complex issue, since traffic signals often traverse several synchronization domains.

Interfacing problems affecting the quality of synchronization are almost inevitable. Oscilloquartz presents to the users a family of solutions to solve synchronization interfacing problems. They are based on the synchronization of equipment via re-timed E1 or DS1 signals.

Re-timing consists in “imprinting” the timing of an available synchronization signal onto a given traffic signal, usually an E1 or a DS1 signal.

In the Re-timing function, the outgoing traffic signal contains the traffic data coming from the traffic input and the timing coming from the synchronization input. The outgoing traffic signal can then be used for synchronising other telecom equipment such as a switch or a base station.

Re-timing is useful in all situations, where there is no other way than taking a traffic-carrying E1/DS1 signal to synchronise an equipment, and when the original E1/DS1 signal is affected by excessive levels of wander.

Although synchronization is usually distributed via the SDH or SONET transport network, there are situations where this type of synchronization cannot be used. If a synchronous equipment such as a switch does not feature an external timing input, there is no other way than using one of the traffic-carrying E1/DS1 signals entering the switch its synchronization.

E1/T1 based retiming synchronization solutions by Oscilloquartz is the number one set of solutions and provide the highest capabilities for high performance reference when state of the art stability and competitive accuracy are needed at a minimum price. Oscilloquartz offers numerous variants, from single channel stand alone box up to 56 channels GPS based retiming.

OSA 5241 Retimer's principle of operation is based on quartz oscillator frequency locked to frequency references signals provided on the two inputs.

The basic concept is rather simple : a buffer stock memory is used in write / read sequence, write being driven by clock recovery from the averaged incoming signal, the read being driven by a smooth synchronisation signal to provide a “wander free” outgoing traffic signal containing the traffic data coming from the traffic input and the timing coming from the synchronization input. The outgoing traffic signal can then be used for synchronising other telecom equipment such as a switch or a base station.

The main aspect of operation of the OSA 5241 retimer are :

• Retiming is applied on E1 traffic signals when affected by excessive wander, acceptable for the transport of traffic, but excessive for the distribution of synchronization
• The long-term frequency (data rate) of the traffic signal must be locked to the network PRC,
• The retiming buffer transmits the incoming traffic at the data rate of the synchronisation signal, thus removing the excessive wander.
• Retiming is used when E1 or T1 traffic signals transported over SDH or SONET are used as synchronisation links (e.g. GSM base station or UMTS B-node).

Main Applications

• Synchronisation reference for UMTS-3G base station;
• Synchronize any equipment from traffic carrying E1/T1 signal;
• Wander filtering.