ACCURATE ELECTRONICS 104003C Manuale - Pagina 4

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ACCURATE ELECTRONICS INC

WWW.ACCURATE.ORG

PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008

FIGURE 5. Module Switch Locations.

TONE-LOOPBACK FREQUENCY

3.09 Tone-loopback frequency is selected by means of 10-position DIP

switch (S3) located on the 104003C's daughter pcb. Only 1 switch position

is required to select any 1 of 11 available frequencies. The available loopback

frequencies and settings of switch S3 are summarized in Table 3.

Table 3. Loopback Frequency Selection.

FREQUENCY

(Hz)

2813

2713

2513

2413

1913

1813

1713

1613

1513

1413

1313

*all other S13 switch positions MUST be set to the OFF position.

LOOPBACK LEVELS

3.10 Loopback levels of +16, +9, -16, or –23dB are selected via DIP switch

S4, located on the 104003C's daughter pcb. Loopback level options are

described in paragraph 2.10; the various settings of switch S4 are summarized

in Table 4.

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Practice Section 104003C Rev A

S3 SWITCH POSITION

SET TO ON*

All switch positions OFF

January 2014

BEAVERTON OR USA 503.641.0118

Table 4. Loopback Level Selection.

Loopback Levels

+16dB

+9dB

-16dB

-23dB

ALIGNMENT

3.11 This alignment subsection is divided into two parts: preliminary

alignment and final alignment verification. In the preliminary alignment

procedure, impedance options are selected, equalization is introduced into the

receive and the transmit channel (if required), and gain or attenuation is

introduced in both the transmit and the receive channel to match the

transmission levels specified on the circuit level record (CLR) card. In the

final alignment verification procedure, the 104003C is placed into service and

end-to-end transmission measurements are made. If the measured levels

differ from those specified on the CLR card, the front-panel TX and RX

LEVEL switches are adjusted to provide the specified levels.

Note: Two condensed preliminary alignment procedures (Figures 6 and 8)

and two condensed final alignment verification procedures (Figures 7 and

9) may be used to facilitate alignment of the 104003C module.

PRELIMINARY ALIGNMENT

3.12 Refer to the CLR card for the required facility port and terminal port

impedances. In general, the 1200-ohm option is used to interface loaded

cable, the 600-ohm option is used to interface nonloaded cable, carrier,

station apparatus, or SF signaling units, and the 150-ohm option is used to

interface short segments of nonloaded cable in applications where a small

degree of slope equalization is required. Use S2 (Main Board) to set the

facility port impedance and S4 (Main Board) to set the terminal port

impedance.

FAX 503.646.3903

Switch Positions

S4-1

S4-2

Off