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DTS 4020.timebridge

The DTS 4020.timebridge serves as an interface between the IEEE1588 protocol (multicast slave clock / PTP slave) supplied across a packet network to traditional serial Time-of-Day (ToD), 1PPS, 10MHz and IRIG B signals or NTP client in a PTP / NTP network.

In order to achieve higher data rates and better voice quality via IP technology, all base stations must be synchronized with high accuracy, a maximum time deviation of 5 µs. For the conversion to IP, a large part of the old infrastructure will be retained. Some of the base stations will be equipped with new hardware to become IP-compatible. However, since all base stations themselves are not PTPv2 compatible, a PTP slave (DTS 4020.timebridge) can be used. The PTP slave (DTS 4020.timebridge) is converting the PTP signal to ToD (Time of Day + 1pps) compatible with the base stations. The DTS 4020.timebridge transmits the 1PPS / 10MHz and ToD signal in the required CCSA (China Mobile) format to the base station and achieves an accuracy of < +/- 100ns in the laboratory (Tested with a radio link).

  • DTS 4020 is a PTP Slave according to IEEE 1588 for high precision synchronization. In existing network infrastructure it provides a low cost upgrade enabling migration from a TDM to packet based timing and synchronization (e.g. Ethernet backhaul).
  • The high performance DTS 4020.timebridge can reply to more than 10'000 NTP and SNTP requests per second, which allows for the synchronization of several thousand clients.
  • The DTS 4020 supports NTP authentication for increased security, which allows the clients to verify the source of the received NTP packets.
  • Operation over LAN via MOBA-NMS (SNMP), SSH or SNMP protocols is possible. SSH and SNMP (MD5 authentication and DES for encryption) enable a secured connection.
  • Alarms are reported via SNMP messages, e-mail or by alarm relay. Additionally, the alarm is indicated on the Alarm LED.

Technical Features

2 completely separated LAN ports (2x RJ45):

  • Synchronize to PTP on 1 port
    · 1- and 2-step slave
    · different profiles and domains
    · multicast/unicast
    · IPv4/IPv6/Layer 2
  • Provide NTP on 2 ports (typically >10’000 requests/s on both 2 ports combined)

Multi-purpose device due to the different time code and frequency outputs:

  • 1 x Time of Day
  • 2 x Pulse/frequency/IRIG output
  • 1 x IRIG-B/10MHz sinus
Application

APPLICATION EXAMPLE OF A PTP SLAVE (IEEE 1588 PTPV2) FOR TELECOM SECTOR

The highly accurate time synchronization for the base station is achieved by using the Precision Time Protocol (PTP, IEEE Standard 1588-2008). The PTPv2 protocol with the ITU G.8275.1 profile can be selected to synchronize a PTP Slave. Therefore, a PTPv2 capable network is required, every hardware component must support PTP with this ITU G.8275.1 profile (Boundary Clock or Transparent Clock). Since all base stations themselves are not PTPv2 compatible, a PTP slave (DTS 4020.timebridge) has to be used.

The DTS 4020.timebridge PTPv2 slave transmits the 1PPS / 10MHz and ToD signal in the required CCSA (China Mobile) format to the base station and achieves an accuracy of < +/- 100ns.

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Technical Datasheet

Instruction & Operation Manual