Appendix A
Itemized Equipment
Maintenance of Communications, Computers, 
Metering and Building Services

Maintenance
Priority
ISO New England Computer Equipment (EMS System)                  (Note 1)

Any equipment or device that may interrupt or alter
The flow of data critical to system operation via the 
EMS –
	Not supported by a back-up system							A
	Supported by a back-up system 							B
Control Room Printers and Loggers 	 							B
Man/Machine Consoles
	Console keyboards										A
	Console CRT’s
		More than 1 CRT of a Multiple	CRT Console				A
		1 CRT of a Multiple CRT Console						B
Console Trackball/Mouse										A

Other Equipment at ISO New England

Computer Room Air Conditioner									A
Fire Protection System										A
Lower Equipment Room Air Conditioner							A
Un-interruptible Power Supply (UPS)							A
Frequency Measuring											B
Security System											B
Analog PCE												A
Diagram Board Displays										B
Recorder Panel (Including Digital Displays and Clock)				A
Telephone Message Recorders									A

Microwave

Microwave Equipment directly affecting the ISO New England facility.
Includes all channels as listed below:
	Loop and spur RF equipment affecting loop operation, all loop
	Closing equipment, and all other loop and Satellite spur
	Station equipment having an effect on ISO New England channels	A

Voice Communications

Dispatcher Microwave Telephone Circuits –
	ISO New England Satellites/SCADA Centers/Generators or
	Generator dispatch designee								B
Dispatcher telephone circuit - ISO New England/NYPP				A
Dispatcher telephone circuit - ISO New England/New Brunswick		A
Dispatcher telephone circuit - ISO New England/Hydro-Quebec			A
Dispatcher party line circuit - ISO New England/Satellites			A
Control Room Direct Dial Outside Lines							A

Appendix A (Cont.)
-2-

Administrative Microwave Telephone Circuits – 
	ISO New England/Satellites/SCADA Centers					B
Administrative telephone circuits - ISO New England/NYPP			B
Administrative telephone circuits - ISO New England/New Brunswick	B
Administrative telephone circuits - ISO New England/Hydro-Quebec		B

Control, Telemetering, and Data Communications

Data Links - ISO New England/Satellites/SCADA Centers				A
ISO New England Tie Line Telemetering – Primary Circuit
	(Telephone and Microwave)								A
ISO New England Tie Line Telemetering – Secondary Circuit			B
Security Coordinator Information System (SCIS)					A
Weather Services System (Includes modem, telephone circuit,
	satellite dish, and CRT’s)								B
ISO New England Automated Hydropower Scheduling System
	(ISO New England CPU, communication circuits, and CRT’s)		A
Communications Channels for Special Protection Systems				A

Satellite and SCADA Center Computers

Any equipment or device that may interrupt or alter the flow
of data critical to system operation via the ISO New England EMS –
	not supported by a back-up system							A
	supported by a back-up system								B

Remote Terminal Units, Communication, and Control Circuits for 
Units Capable of AGC Control.								A

Remote Terminal Units and Analog Telemetry Supplying Data
To Satellite Computers									B

APPENDIX A NOTES:

1.	Codes prescribing the requesting of technicians services to 
accomplish repairs:

A.	Immediate.

B.	Regular staff hours except if more than sixteen (16)
hours removed.

C.	Regular staff hours.

2.	Any equipment not specifically mentioned in this procedure will be 	handled on a case by case basis with the Operating Staffs at ISO New 	England, the Satellites and SCADA Centers determining the Criteria for 	Maintenance.  

OP2REV022398