ZOB controller experienced operational error with en route and crossing aircraft at FL370.

Attributes
ACN	634717
Time
Date	200410
Day	Thu
Place
Locale Reference	atc facility : zob.artcc
State Reference	OH
Altitude	msl single value : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : developmental
ASRS Report	634717
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas other controllera
Resolutory Action	controller : issued alert flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 1400
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #2 was in level flight eastbound. Aircraft #1 was issued crossing restr which converged with aircraft #2. Aircraft #1 was issued frequency change before vertical separation was established between the two.

Original NASA ASRS Text

Title: ZOB CTLR EXPERIENCED OPERROR WITH ENRTE AND XING ACFT AT FL370.

Narrative: ACFT #2 WAS IN LEVEL FLT EBOUND. ACFT #1 WAS ISSUED XING RESTR WHICH CONVERGED WITH ACFT #2. ACFT #1 WAS ISSUED FREQ CHANGE BEFORE VERT SEPARATION WAS ESTABLISHED BTWN THE TWO.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.