Prima Stratum

GPS Stratum 1 Timing

GPS based Stratum 1 Clock for Synchronous Telecom Networks

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6" (L) x 4” (W) x 1.50” (H)
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Rear Panel: 12/30 VDC with Negative 48 VDC Screw Term Adapter (option)

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Prima Stratum

GPS Stratum 1 Timing

Prima Stratum

GPS Stratum 1 Timing

GPS based Stratum 1 Clock for Synchronous Telecom Networks

Product Image


6" (L) x 4” (W) x 1.50” (H)


Prima Stratum A stand-alone, GPS Disciplined Oscillator based TDM/Ethernet timing source. The EngagePrimaStratum provides Stratum 1 level timing signals for the interfacing of TDM and IP based circuits. A stand-alone, GPS Disciplined Oscillator based TDM/Ethernet timing source. The EngagePrimaStratum provides Stratum 1 level timing signals for the interfacing of TDM and IP based circuits. 

Enable One to Four T1/E1 timing interfaces with Stratum 1 Timing Signals.

The PrimaStratum receives GPS satellite timing signals to control an onboard oscillator providing from one to four T1 or E1 Stratum 1 reference clocks. The PrimaStratum utilizes a mixed-signal phase lock loop GPS driven frequency module to generate extremely accurate 1.544MHz/T1 and/or 2.048MHz/ E1 references clocks that are frequency locked to the Global Stratum 1 source. The Stratum 1 clock is the basis for all telecom voice and data interfaces, required to assure proper synchronization of signals and call quality. The PrimaStratum incorporates this timing signal as a source for timing multiple telecom digital interfaces (T1/E1). These interfaces can be used to synchronize even remote telco equipment to a reliable, standard timing signal.

An Ethernet Switch Option provides transparent LAN bridging, user data bandwidth and access control through rate limiting and port-based VLAN filtering and tagging. This added functionality permits the PrimaStratum to be especially useful for installations requiring the multiplexing of legacy cellular services, such as 2G, with newer 3G and 4G circuits.

IP Backhaul Timing Source

The PrimaStratum guarantees TDM timing signal availability as a basis for all voice and data circuits no matter how remote or isolated the location of the interface equipment. Applications include cellular backhaul, remote data/voice extension, Last Mile data services in rural and remote areas, upgrade of existing TDM carrier circuits to combined IP and TDM backhaul interfaces.

Prima Stratum Standard Features

Telco Timing Extension

The Engage Prima Stratum provides superior timing synchronization for the most isolated and remote locations. The system is a cost-effective, small footprint unit, easily rack or shelf-mountable. The unit provides up to four T1/E1 interfaces and communication ports for remote management, alarm monitoring and configuration. The four interfaces can be used a Stratum 1 clock references or can support up to two interfaces for injection mode re-timing. Management of the unit can be via Ethernet (SNMP) or console interface. The Prima Stratum has a built-in antenna interface that permits extension of the appropriate GPS antenna.

Injection Mode Timing

The Prima Stratum Injection mode timing adds Stratum 1 clocking to individual circuits as they are passed through the unit. Two T1, two E1 or one T1 and one E1 circuit can be connected to the Prima Stratum. The unit than re-times these circuits to the GPS based Stratum 1 timing oscillator within the Prima Stratum. The out circuits can be used to provide timing for carrier service equipment at the remote location or Base Station.

Secure Socket Shell - SSH

Engage’s Secure Socket Shell, which is based upon industry proven Open SSH and FIPS 140 approved Open SSL version 2.0, provides secure encrypted communications between SSH clients such as OpenSSH, SecureCRT, and PuTTY and the IPTube’s Command Line Interface.


The Prima Stratum is able to be fully managed with SNMP via standard and private MIBs. Large scale deployments of Engage Communication products with centralized management have made SNMP support a priority. The Prima Stratum is easily controlled and monitored when installed within a larger network of SNMP managed products. SNMP Traps for error events enable proactive service fault isolation.

Prima Stratum Optional Features

Ethernet Switch OPTION - SWITCH

The Prima Stratum is available with a five port 10/100 Ethernet QoS switch integrating a high-performance switching fabric with four priority queues. The switching capability is useful when combining legacy mobile services with newer IP based services for backhaul and service consolidation. The GPS timing interface serves dual purposes, Stratum 1 clock and service multiplexer.

Advanced features include 802.1p/IPv4/IPv6 traffic classification, full IEEE 802.1Q VLAN, RMON, SNMP, Port Monitoring and Layer 2 firewall. QoS determined by destination MAC address, port ID, IEEE 802.1p and multimedia traffic tags, IPv4 Type of Service (TOS), and Differentiated Services (DiffServ).

Pay-As-You-Grow Field Upgrades

The PrimaStratum GPS Timing Source is designed for Pay-As-You-Go growth from one through four T1/E1s per unit. Customers can elect to economize initial network installations, by purchasing their PrimaStratum with a single active port. As the network grows enable additional ports via a software-based license key. Additionally any port on the PrimaStratum can be configured as T1 or E1, so a unit supports a mixed combination of ports. This permits even T1 standard sites to utilize the extra bandwidth of E1 circuits as interfaces when needed for additional back-haul throughput.


Prima Stratum Benefits

GPS Locked Stratum 1 Clock Source for T1 or E1

Pseudowire and Ethernet Timing Recovery

Mixed-signal phase lock loop, GPS driven frequency module

Remote Clocking for Base Station Equipment

Built-in Ethernet Switch for 3G/4G Multiplex

Easy installation with IP-based management and carrier grade diagnostics.

Stratum 1 Timing for Cellular Backhaul

Base Station Conversion
As Base Stations are upgraded to 3G and 4G networks, the networks supporting such stations are also upgraded to IP based connections. The system incorporates both synchronous and asynchronous interfaces. The issues are seen at the remote base station, telcom timing is lost over the IP network and often a more reliable clocking source will be needed to maintain call quality and connections. The PrimaStratum can be added to the far-end base station to provide this clocking signal.

Mobile Service Drop-off

Mobile Carrier Service Drop-Off Mobile systems require extremely accurate clock sources at often very remote locations. Add to this fact that at these locations several carriers might be sharing base station equipment and separate TDM circuits need to be accessed per carrier. Without a local source of Stratum 1 timing, these circuit drop-offs can be a significant source of issues. The PrimaStratum provides a source of Stratum 1 timing at even these remote locations to assure that all carrier circuits are timed correctly and drop-off is with a minimum of problems. 

Built-in Ethernet Switch

A four (4) port Ethernet switch is an option available on the Prima Stratum. The Ethernet switch functionality is a major plus to mobile operators as they move to upgrade their existing circuits to 3G and 4G services. A rate limiting capability built into the switch means that available bandwidth can be allocated to T1 or E1 circuits for voice backhaul or can be reserved as 3G and 4G data usage increases. 

Broadband Service Providers

Telco Compatible

The PrimaStratum is designed to meet all telco equipment installation. Powered by AC, 24VDC or -48VDC, the unit can be used in Base Station equipment rooms with no special interface restrictions.


Telecom Interface
  • 1 -4 T1 or E1, RJ-45 (E1 120 ohm to 75 Coax Balun Optional)
  • T1: Framing ESF or SF/D4; Coding B8ZS or AMI
  • E1: Framing CRC4 or FAS or UnFramed; Coding HDB3 or AMI
Comprehensive Clocking
  • Internal – the master clock source for the TDM circuit is provided by an internal GPS recovered clock oscillator
LAN Network Interface
  • One 10/100BaseT Full/Half Ethernet (2nd LAN requires Switch)
  • Auto negotiation or Configured Speed and Duplex
LAN Network Protocols Supported
  • Assured Delivery Protocol
  • DHCP
  • DNS Address Discovery
  • Dynamic DNS
GPS Receiver
  • Receiver Input: 10MHzL1 C/A Code. Coarse Acquisition Position Accuracy: typical 10 m RMS Tracking 4 satellites.
  • Tracking: 12 parallel channels. Multi satellite ensembling with TRAIM.
  • Acquisition Time: Cold Start <45 sec / Hot Start < 2 sec Re-acquisition < 1 sec 
  • 1PPS output accuracy:UTC(USNO):+/- 30 nS RMS 100ns peak
  • Frequency output accuracy: 1 X 10-12@ 1 day
  • Frequency/timing
  • Modified Allen Deciation frequency stability (TCXO):
  • 1 X 10-9 @ 0.1 sec
  • .9 X 10-9 @ 1 sec
  • .5 X 10-10 @ 10 sec
  • .9 X 10-10 @ 100 sec
  • Meets ITU–T G.811 Wander Generation Mask
  • Meets ETSI–PRC Wander Generation Mask(with OCXO reference)
  • CE
  • Safety -IEC60950
  • EMC - CFR 47 Part 15 Sub Part B:2002, EN55022:1994 + A1 & A2, EN55024, ICES-003 1997, CISPR 22 Level A
  • Telecom Part 68
  • Remote config., monitoring, & reset
  • Secure Socket Shell - SSH Diffie-Hellman Group1/14 key exchange and strong integrity checking via MAC SHA1/SHA1-96 with Cipher AES-128 and 3DES and DSS and OpenSSH public key format
  • Telnet support with Edit and Paste Template Files
  • Console Port for Out of Band Management
  • SNMP support (MIB I, MIB II, Engage proprietary) with configured traps 
  • Temperature: 0–50°C (32–122°F).
  • Optional Extended Temp ranges avail. 
  • Humidity: Up to 90% non-condensing 
Rear Panel/Power
  • 10-30 VDC, 1.0A.
  • Screw Locking Connector
  • Power 7 Watts 
  • Universal Adapter 100/240 VAC 50/60 Hz
  • Optional -48V 0.25 Amp
  • Hot Standby 
  • Dimensions: Length 7” (17.78 cm); Width 5.5” (14 cm); Height 1.50” (3.81 cm) 
  • Weight 2 Pounds (1 kilogram) 
  • Telco Diagnostics: Local Loop, Remote Loop, Loop Up/Down NIU and CSU Codes. Enables isolation of connectivity faults to local, network or remote equipment
  • Physical layer alarms for LOS, AIS, LOF 
  • Comprehensive statistics: LAN and IP layer network statistics: such as packet loss and packets arriving late, out of sequence, underruns, overruns CRC, and delay variation (jitter).

Ordering Information

Part No.



PrimaStratum, *Note: x = number of T1 ports to be enabled (1 to 4)

Optional Features

Optional Features


ROHS compliant materials and processes, Restriction of Hazardous Substances no Pb


Add Stratum 3E fall back clock source to TCXO - manual switch


PrimaStratum Antenna Option - 10 Meter Cable

Rack Mount Options

Rack Mount Option


Power Module 10/30 VDC ADAPTER, Ships with Universal Adapter 90/240 50/60


Power Supply Module 10/30 VDC Screw Term, Great for 24 Volt Cell Sites


Power Supply Module Negative 48 Volt DC, Isolated Negative 48 Volt Power

Rack Mount Options

Rack Mount Option


3 Unit 19" x 1RU Rack Mount Kit for 5.5" Products

So What's Next?


Engage Communication
9565 Soquel Drive. Aptos, CA 95003
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Telephone: 1-831-688-1021
Toll Free : 1-877-ENGAGE4
Designed, Fabricated, and Assembled
in America 
Supported Worldwide