TEK-200

E1 Filter - Model TEK-200

Product Overview

The TEK-200 E1 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 E1 lines, which traverse various SDH multiplexers rather than physical copper wire or conventional E13 multiplexers. The extracted E1 timing can become corrupted by pointer adjustments and multiplexing queues. Spectracom's Timing Enhancement Kit (TEK™) provides a simple, economical solution to this problem.

The TEK-200 uses a timing filter to maintain the phase integrity of the 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.

Core or host systems accept references from a Synchronisation Supply Unit (SSU). Edge aggregation and remote switches generally do not have external clock inputs, instead deriving their timing from the E1 line connected to the host. The remote acts as a slave clock following the line input. This makes it susceptible to timing anomalies introduced by pointer adjustments or multiplexing schemes, which can cause the clock in the remote switch to lose sync.

When the TEK-200 detects the phase shifts that occur on the E1 line, it removes those phase shifts, maintaining less than 0.05 UI of phase movement on the delivered E1 line. Removing the phase shifts allows the input circuits of downstream client devices to maintain their locks on the host's clock.

The TEK-200 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 mounting solutions for ETSI cabinets/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 (24 nsec at E1 rate) phase change on the output (Phase Buildout). 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 ≤24 nsec (0.05 UI at E1 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
Alarm Conditions	Loss of one or both power inputs Internal failure of unit
AMI Input & Output, Alarm Relay Contacts	RJ Connectors; alarm relay contacts rated at 2A max.
Input Framing	Operates with either Channel Associated Signaling (CAS) or Common Channel Signaling (CCS) on E1 line.
Line Coding  Selection	AMI or zero-suppression (HDB3)
Output Impedance	E1: 75 ohm +/-6% or 120 ohm +/-6%, switch selectable
Output Level DS-1	0 dB (default) or –7.5 dB; switch selectable
Output Squelching	Output squelched in event of unit failure or input LOS, or if no output clocking signal is available.

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	-5° C to 70° C (23° F to 158° F)
Rate of Change	+/-30° C/hour (+/-86° F/hour)
Storage Range	-40° C to 85° C (-40° F to 185° F)
Relative Humidity	5-95%, non-condensing
Vibration	0.008 g^2/Hz @ 5-20 Hz; 0.05 g^2/Hz @ 20-100 Hz
PHYSICAL
Size/Weight	173.0 mm W x 48.0 mm H x 102.0 mm D, 0.45 kg (6.8125” W x 1.875” H x 4.0” D, 1.0 lbs)

Ordering Information

TEK-200	E1 Filter
Mounting	480mm/580mm (19"/23") Rack Mount Kit