NEC nd-20292 manual NC = Not connectable, By an, = Compatible with other, Power Requirements

5. Optional Equipment

Table 200-4 shows optional equipment that can be installed in Multiline Terminals. When a DPA-E Unit, DTA-E Unit, or both, are installed in a Multiline

Terminal, the Terminal must be supported by an ESI-EB ETU.

OPTIONAL

NC = Not connectable		C = Connectable
*Required to be supp orted	by an	ESI-EB ETU.
l = Compatible with other	options	simultaneously

220.5POWER REQUIREMENTS

1.When AC power is to be used to power the system, a PSE-AD-1 PSU must be installed in each CCU.

The system must have a dedicated grounded nominal 117V AC f 10% outlet. (See paragraph 220.12,)

The AC outlet must be a standard 125 Volt 15 Amp

three prong type, which provides circuit ground. If circuit ground is not available, a locally provided frame ground to earth ground connection must be

provided. (See paragraph 220.6).

The AC power must be within the limits provided in paragraph 220.12 of this document.

It is recommended that the best locally available AC surge protection be installed at the AC power outlet.

2.When DC power is to be used to power the system, a PSE-DD-1 PSU must be installed in each CCU. A locally provided nominal -48VDC power source must be connected to the PSE-DD-1 PSUs.

A frame ground, to earth ground, connection must be provided, as described in paragraph 220.6. The -48VDC power source must operate within the limits provided in paragraph 220.12.

220.6 GROUNDING REQUIREMENTS

The CCUs must be properly grounded. If circuit ground is not available at the dedicated AC outlet,

the following steps should be taken:

ND-20292

CHAPTER 2

APRIL, 1990

1.Provide a suitable cold water pipe ground in

accordance with the operating telephone company procedures.

2.If no water pipe ground is available, a ground rod should be installed in accordance with the local operating telephone company procedures.

3.Where a ground other than conduit ground is used, a grounding terminal is ,provided on the ESE-32B-1 CCU as shown in Figure 200-3.

4. Modem Pooling Grounding Requirements; The RS-232C is susceptible to noise and static and requires proper grounding to protect the DTA-E Unit and DTE connected to it. Normally, Data

Terminal Equipment (DTE) with RS-232C interface has its frame ground connected to earth ground. Therefore, ensure the DTEs connected to DTA-E Units are properly connected to earth via circuit ground of its AC power cord.

The same care should apply to a modem connected to the DTA-E Unit.

If a modem is not provided with a three prong type AC plug supporting conduit ground, the modem must be properly connected to earth ground.

r

1

-

0

Grounding

Terminal

-

(Left Side View of ESE-32B-1 CCU)

Figure 200-3 CCU Grounding

200 - 5