TEK-100

DS1 Filter - Model TEK-100

• Ensures network timing cohesion
• Simple, economical timing solution
• Eliminates timing transients
• Stabilizes timing of edge/remote elements
• Improves data/call continuity
• Automatic cut-thru on failure
• Mounts in existing switch cabinet
• Rack mount optional
• 5-Year limited warranty
• NEBS Level III certified
• RoHS compliant

Product Overview

The TEK-100 DS1 Filter ensures network timing cohesion for remote and edge elements. In today's evolving network topologies, edge and remote network element deployments have increased. Most remotes, however, are still connected through DS1 lines, which traverse various multiplexers rather than physical copper T1 lines. The extracted DS1 timing can become corrupted by pointer adjustments and multiplexing queues. Spectracom's Timing Enhancement Kit (TEK™) provides a simple, economical solution to this problem.

Core and host systems accept timing references from a Building Integrated Timing Supply (BITS). Edge aggregation and remote switches generally do not have external clock inputs, instead deriving their timing from the lines connected to their hosts. The remote acts as a slave clock following the DS1 line input. This makes it susceptible to timing hops introduced by pointer adjustments and multiplexing schemes. These timing hops can cause the clock in the remote element to lose sync.

The TEK-100 uses a timing filter to maintain the phase integrity of the DS1 line clock during pointer adjustments and other timing anomalies caused by multiple multiplexer hops. With Spectracom's TEK, the client's clock does not lose lock, producing effective data movement and ensuring a graceful system recovery on rearrangement.

When the TEK-100 detects phase shifts that occur on the line, it removes them, maintaining less than 0.05 UI of phase movement on the delivered DS1 line. Removing the phase shifts allows the input circuits of downstream client devices to maintain lock on the host's clock.

The TEK-100 employs phase build-out techniques coupled with proprietary adaptive Frequency Locked Loop (FLL) algorithms. This prevents the client network element from falsely locking to multiple phase movements and from de-coupling caused by rapid or large magnitude transients. This ensures network timing cohesion for all edge elements connected to a master system.

The TEK is a compact, hard-wired device designed to mount inside the physical cabinet of the remote switch. Unlike external timing units, the TEK has no need for east/west coding, making the input and output designations more intuitive. This design also minimizes the risk of cascading errors caused by improper connections.

For installations external to the remote switch, Spectracom offers a rack kit for mounting in 19 inch EIA racks or 23 inch WeCo racks.

Technical Specifications

PERFORMANCE
Digital PLL Operation	Bandwidth 0.1 Hz (wide) or 0.005 Hz (narrow); switch-selectable.
	Phase Buildout Input phase changes of ≥3.5 µsec over an interval of ≤0.1 second are absorbed by DPLL without causing ≥0.05 UI (32 nsec at DS1 rate) phase change on the output. Input phase changes of ≤1.0 µsec over interval of ≤0.1 second are not built-out.
Jitter Filtering	When synced to an ideal (jitter-free) signal, the output jitter is ≤32 nsec (0.05 UI at DS1 rate) peak-to-peak
Wander Transfer	When timed by an input signal whose TDEV is less than or equal to the following levels:
	Integration Time T (seconds) Input TDEV (nanoseconds) 0.05 < T < 10 100 10 < T < 1000 31.6 x T^0.5 1000 < T N/A
	The TDEV of the output signals is less than or equal to the following levels:
	Integration Time T (seconds) Input TDEV (nanoseconds) T < 0.05 N/A 0.05 < T < 0.1 1020 x T 0.1 < T < 10 102 10 < T < 1000 32.2 x T^0.5 1000 < T N/A
Reliability	Estimated MTBF > 400,000 hours
INPUTS / OUTPUTS
Power Input	Dual (A & B) –48 VDC; isolated lugs with protective covering
AMI Input & Output, Alarm Relay Contacts	Tip/ring; 0.045” wire-wrap leads with protective covering; alarm closure rated at 2A max.
Alarm Conditions	Loss of one or both power inputs Internal failure of unit
Input Framing	Operates with Super-Frame (SF) or Extended Super-Frame (ESF).
Line Coding Selection	AMI or zero-supression (B8ZS)
Output Impedance	DS1: 100 ohm +/-6%
Output Level (DS-1)	0 dB (default) or –7.5 dB; switch selectable.
Output Squelch	User settable output squelching on fault.

Physical & Environmental Specifications

ELECTRICAL
Supply Voltage	-36 to -72 VDC, ± 2 VDC
Supply Current	Steady-state: 100 mA (at 48 VDC) Start-up: 250 mA (at 48 VDC)
Start-up Voltage Transients	0 V to 75 V
ENVIRONMENTAL
Operating Range	23° F to 158° F (-5° C to 70° C)
Rate of Change	+/-86° F/hour (+/-30° C/hour)
Storage Range	-40° F to 185° F (-40° C to 85° C)
Relative Humidity	95%, non-condensing
Vibration	0.008 g^2/Hz @ 5-20 Hz; 0.05 g^2/Hz @ 20-100 Hz
PHYSICAL
Size/Weight	6.8125” W x 1.875” H x 4.0” D, 1.0 lbs (173.0 mm W x 48.0 mm H x 102.0 mm D, 0.45 kg)

Ordering Information

TEK-100	DS1 Filter
Mounting	19" EIA/23" WeCo Rack Mounting Kit