Frequency distribution, time sources, frequency references

Time and Frequency Distribution
The effective use of master clocks, time sources and frequency references often relies on distribution devices and systems to provide synchronization where it is needed. Products include distribution amplifiers with source fault-detection and failover switches for 10 MHz, 1 PPS, T1/E1, and time codes as shown in the chart. Also available are signal converters and product interfaces. A description of all products follows the tables below.

Distribution Amplifiers / Failover Switches Comparison Chart

	Epsilon Switch & Amplifier System	Quad (1 to 4) IRIG Buffer Amplifier	Frequency Distribution System	Signal Selector / Amplifier	Clock Selector / Amplifier
Model	SAS-E	7535-001	8140	8143	8144
Dist Amp	Y	Y	Y	Y	Y
Auto Failover Switch	Y	N	N	Y	Y
Signal	1PPS, 10 MHz and time code	IRIG	10 MHz	10 MHZ (optional 1PPS)	T1/E1
Input	up to 2	1 to 4	1	up to 2	up to 2
Output	8 or 16 each 1PPS & 10 MHz, custom outputs available	up to 16	1	10	10
Features	Remote management over IP		Power over 10 MHz trunk line

Model Descriptions

Epsilon Switch & Amplifier System

SAS-E Switch & Amplifer Systems offer distribution of signals to many devices in applications where timing and frequency is required - now with remote management. SAS-E models offer automated or manual switching between two precision time and frequency sources. If a fault is detected on one source, the other source is used as the reference. Two versions are available. A 1 RU unit distributes up to (x8)10 MHz, (x8)1PPS and (x2)Time of Day output. A 2 RU unit distributes (x16)10 Mhz, (x16)1PPS, and (x2)Time of Day outputs. Customized signal types and quantities are available.

	7535-001 Quad/IRIG-B Buffer Amplifier (1 to 4)
	The model 7535-001 is a Quad (4) buffer amplifier (1 input to 4 output). Each input is a differential channel routed to four output connectors where every output signal is buffered individually with a unity gain amplifier. This architecture allows four devices to be connected to a single input channel.

	8140 Frequency Distribution System
	Spectracom's Frequency Distribution System comprises of the Model 8140 Distribution Amplifier and combinations of Model 8140T LineTaps, Model 8140MT MultiTaps, and Model 8140VT VersaTaps.

	8143 Signal Selector/Distribution Amplifier
	The Spectracom Model 8143 Signal Selector/ Distribution Amplifier detects failure of either input signal and provides manual or automatic switchover between two frequency sources. The selected input is distributed via twelve buffered output line drivers.

	8144 Clock Selector/Distribution Amplifier
	The Spectracom Model 8144 Clock Selector / Distribution Amplifier detects failure of input clock and provides manual or automatic switchover between two clock sources. The selected input is distributed via twelve buffered output line drivers.

	8185 TimeBurst Wireless Time Link
	The TimeBurst, model 8185, receives time code from NetClock®/2 or NetClock® GPS Master Clock via RS-485, then connects to customer-provided radio console, such as for building security radio. Requires RS-485 wiring such as CW04xxx from NetClock® and to radio console.

	8145 TimeGuard Monitor/Selector
	The TimeGuard monitors the RS-232, RS-485, IRIG B/E signals and time sync status of two NetClock®s (example: WWVB and GPS for time reference redundancy). In the event of a primary clock failure, the TimeGuard, Model 8145 automatically switches to the backup clock. An operator-controlled manual override is provided to select either clock. Outputs: RS-232, RS-485, IRIG

	8140VT VersaTap
	The standard VersaTap is a single-frequency telecom clock converter whose output is factory-set to 1.544 MHz (T1) or 2.048 MHz (E1). Specify exact frequency at time of order.

	8179T TimeTap
	A TimeTap converts RS-485 to RS-232 Time Code, allowing the NetClock® time code to reach as many as thirty-two RS-232 devices spanning 4,000 feet

	9388 NTP Ethernet Time Server
	The Ethernet Time Server, model 9388, is an NTP Time Server that offers system-wide split-second timing information to computers over an Ethernet TCP/IP network. The Ethernet Time Server, Model 9388, is synchronized to an RS-485 time code provided by a NetClock GPS master clock.

Time and Frequency Distribution

The effective use of master clocks, time sources and frequency references often relies on distribution devices and systems to provide synchronization where it is needed.

Model Descriptions

Epsilon Switch & Amplifier System

7535-001 Quad/IRIG-B Buffer Amplifier (1 to 4)

8140 Frequency Distribution System

8143 Signal Selector/Distribution Amplifier

8144 Clock Selector/Distribution Amplifier

8185 TimeBurst Wireless Time Link

8145 TimeGuard Monitor/Selector

8140VT VersaTap

8179T TimeTap

9388 NTP Ethernet Time Server