Brandywine’s Modular Master Clock represents the next generation of modular timing systems.  Built on the highly successful High Performance Timing System, the Modular Master Clock is a leap forward in design.


  • Redundant design with multiple signal paths built in for high-availability.
  • The modular design is highly adaptable and can be field-upgraded, allowing a future-proof solution
  • 12 expansion slots in the 2U version and 6 expansion slots in the 1U variant.
  • Ideal for applications that require an unusual mix of interfaces
  • Unique optical crosslink architecture for either Master-Slave hierarchical setups or Master-Master crosschecking and failover
  • 2U version is operated by an intuitive touch-screen interface, a first for any master clock system.
  • All key components are hot-swappable and are dual redundant.
  • The Output Signal modules are hot-swappable from the front, eliminating the need to disconnect cables.
  • Secure Management interface through SNMPv3 and encrypted password access from the front panel

At the center of the system are Brandywine’s powerful dual-redundant Master Clock Modules (MCM), which are capable of receiving time from a GPS?/IRNSS signal, either from an internal SAASM or standard CA code receiver, or external reference sources, such as IRIG-B, 1PPS, 10 MHz or HaveQuick.

The output signals for the Modular Master Clock are generated by up to 12 hot-swappable Output Signal Modules (OSM), and are ideal for custom solutions or future expansion. Available modules include NTP module, Analog Low-Phase-Noise frequency module, IEEE-1588 PTP module, time code modules such as IRIG A, B, G, H, and NASA 36, Pulse Rates, PTTI, as well as an optical crosslink module.

Product Specifications
Product Data Sheet
User Manual

Signal Reference Inputs

C/A code GPS Receiver (optional)

Receiver Type    GPS L1 C/A, SBAS L1 C/A 

GPS Reception   14 channels (GPS, SBAS)

Sensitivity         Tracking: -159 dBm

    Acquisition: -147 dBm

Accuracy           15ns (1σ) (@ -130 dBm)

TTFF                Hot Start: <5 sec (@ -130 dBm)

   Warm Start: 70 sec (@ -130 dBm)

   Cold Start: 70 sec (@ -130 dBm

IRNSS Receiver (optional)

Receiver Type    GNSS Multi-constellation
                              (GPS, GLONASS, NavIC (L5+S band)

Sensitivity       Tracking: -153 dBm
                       Acquisition: -145 dBm

Accuracy          15ns (1σ)

SAASM GPS Receiver (optional)

Receiver Type      GB-GRAM Type II 

Keyfill cable         DAGR compatible DB15 

External 1PPS Input

Signal Format      Per ICD-GPS-060B

Rate                    1 pulse per second

Impedance          50 ohm

External GPS Have Quick T/C Input

Signal Format      Per ICD-GPS-060A, STANAG 4246 HQ2A

Rate                   1 frame per second

Impedance         1k ohm

Connector Type   DB15M 

External IRIG B Input

Signal Format        IRIG B Per IRIG 200-04

Control Functions   Per IEEE1344

Modulation ratio     2.5:1 to 3.3:1  

Amplitude             1 Vp-p to 5Vp-p

Impedance           >600 ohm

Connector Type     DB15M 

External 10MHz Reference Input

Frequency 10 MHz ± 5E-11
Amplitude  8 - 15 dBm
Impedance 50 Ω
Connector Type          BNC 



2 power supply slots are available on both 1U and 2U chassis. 2U chassis can be either AC input, DC input or a combination. 1U is single or dual AC supply only.

AC Supply 
  Voltage  90-265 VAC 50/60 Hz.
 100W Maximum
  Connector  IEC 320 C14 (standard)
 MS3102A-10SL-3P (optional MS shown) 
DC Supply  
  Voltage  18-36 VDC
  Connector  Barrier Terminal Block


 Length (depth)  20.00"
 Width  17.00"
 Chassis Width  19.00"
 Height  3.47" (2U Chassis)
 1.72" (1U Chassis)
 Weight  25 lbs. nominal
 (slides not included)


Air Temperature  -15 to 55ºC 
Altitude Conditions  -1500 ft to +11,000 ft 
Airflow   30 cfm front to side/rear.  Side airflow is not obstructed by rack slides

Shock and Vibration

Operating Shock   MIL-STD 810F 20g/11ms
Bench Handling  MIL-STD-810F
Vibration  MIL-STD-167-1
Structure-borne Noise  MIL-STD-740-2


FCC Part 15, Class A 


 Available upon request.

About Brandywine Communications

Brandywine Communications Inc. offers superior products to the time and frequency marketplace. Our mission is to provide the finest equipment coupled with excellent before and after sale service.

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Contact Us

Brandywine Communications
Ultra-Precision Time & Frequency

1153 Warner Ave
Tustin, CA 92780
Phone: +1 (714) 755-1050