NEC DSX Technical Guidelines

Since the NEC DSX Systems have dual use slots it gives the user more options when it comes to line/station combinations. Because of this it can be a little confusing when trying to configure exactly how many cards of each you can add in each cabinet. The below information will help you determine that.

The combination of lines and extensions you can connect to your DSX system may be limited by the System Load Factor. Use the DSX-80/160 System Load Factor Worksheet on the next page to verify your system’s configuration. When entering data on the worksheet, for each installed card make entries for each Load Type. There are two Load Types to consider: 5 VDC and 40 VDC.

To check your system configuration:

1. Indicate the quantity for each card installed in the Qty column.
- The number of keysets, single line sets, and DSS Consoles does not affect the load factor.
2. For each item and for each Load Type, multiply the Qty times the Load and enter the value in the Total column.
- For example, two 16ESIU Cards have a load of 16 for 5 VDC and 40 for 40 VDC.
3. Add up the entries in each Total column and enter the values in Item 1: Load Type Totals.
4. Review Item 2: Power Supply Capacity and determine the capacity of the power supplies installed in your system.
5. Compare the capacities in Item 2 to your entries in Item 1. Item 1 must always be equal to or less than the entry in Item 2.

Important

Do not operate your system if the total for either Load Type exceeds the Power Supply Capacity of your installation.

DSX-80/1 60 System Load Factor Worksheet     Load Type Description Qty 5 VDC 40 VDC     Load Total Load Total CPU Card (1090010) 1 12 12 0 0 16ESIU Card (1091004)   8   20   8SLIU Card (1091010)   5   8   16SLIU Card (1091007)   10   16   8COIU Card (1091009)   3   0   16COIU Card (1091005)   6   0   T1/E1/PRI Card (1091006)   8   0   Item 1: Load Type Totals         (Cannot exceed Item 2: Power Supply Capacity.)   Item 2: Power Supply Capacity   If you have one power supply installed, the capacity is:                       5 VDC = 40             40 VDC = 48 If you have two power supplies installed, the capacity is:                    5 VDC = 80             40 VDC = 80 If you have three power supplies installed, the capacity is:                  5 VDC = 120           40 VDC = 120 Notes: •       DSX-80 can only have 1 power supply. •       DSX- 160 can have up to 3 power supplies. You cannot have more than two 16ESIU Cards per power supply, regardless of System Load Factor calculations. •       Exceeding the allowed Load Type Total (Item 1) will cause the system’s power supplies to automatically shut down and/or cause erratic system operation. •       The total of all station, line, DSS Console, and voice mail ports cannot exceed 160.

Have an OLDER NEC DS1000/2000? Here are the Technical Guidelines for these:

NEC DS1000 Technical Guidelines

Since the NEC DS1000/2000 Systems have dual use slots it gives the user more options when it comes to line/station combinations. Because of this it can be a little confusing when trying to configure exactly how many cards of each you can add in each cabinet. The below information will help you determine that.

System Load Factor Configuration for the NEC DS1000

1. Indicate the quantity for each item installed in the Qty column.

2. For each item, multiply the Qty times the Load Factor and enter the value in the Total Load column.

3. Add the values in the Total Load column and enter the value in row 1.

4. Compare the entry in row 2 to your entry in row 1.

Do not operate your system if the System Load Factor Total (row 1) exceeds the allowable load of 30 (row 2)

Item Load Factor Qty Total Load   1   1 Digital Telephone and NEC Digital Door Box 1 1 1 Analog Telephones or Analog Single Line Devices (like a fax, cordless phones, answering machines, etc) 1 1 1 NEC Analog Door Box 0 1 1 24 Button DSS Console* 1 1 1 110 Button DSS Console* 2 1 1 *Total DSS Consoles installed CANNOT exceed 4 1 1 1   1 1 1 1. Total Load For This Configuration: 1 1 1 2. Maximum Allowable Load 1 1 30