ACCURATE ELECTRONICS 104003C Manual - Page 8

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ACCURATE ELECTRONICS INC

WWW.ACCURATE.ORG

PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008

10. CONDENSED ALIGNMENT PROCEDURES

Figure 6. Preliminary alignment procedure- no

equalization

1.)

Refer to the CLR card and determine the following: facility port

impedance, terminal port impedance, receive 1000Hz input and

output signal levels, and transmit 1000Hz input and output signal

levels. Once the facility levels are known, proceed to step 2 and

perform the remaining preliminary alignment steps in numeric

order. The paragraph referenced after each step contains a more

detailed explanation of that specific procedure. After completing

step 6, proceed to the final alignment verification (without

equalization) procedure (Figure 7) for instructions on making end

–to-end measurements.

2.)

Set S2 (Main Board) for facility port impedance. (paragraph 3.8)

3.)

Set S4 (Main Board) for terminal port impedance. (paragraph

3.8)

4.)

If the specified receive input level is lower than the specified

receive output level, gain must be added. If it is higher, loss must

be added. Set front panel RX GAIN/LOSS switch to either GAIN

or LOSS, as required. To determine the required amount of gain

or loss, calculate the difference (in dB) between the specified

receive input level and the specified receive output level. Set to

IN the proper combination of front panel RX LEVEL switches

that adds up to the required amount of gain or loss. (paragraph

3.6)

5.)

If the specified transmit input level is lower than the specified

transmit output level, gain must be added. If it is higher, loss must

be added. Set front panel TX GAIN/LOSS switch to either GAIN

or LOSS, as required. To determine the required amount of gain

or loss, calculate the difference (in dB) between the specified

transmit input level and the specified transmit output level. Set to

IN the proper combination of front-panel TX LEVEL switches

that adds up to the required amount of gain or loss. (paragraph

3.6)

6.)

Insert the module into its mounting position, apply power, and

proceed to the final alignment verification (without equalization)

procedure (Figure 7).

Figure 7. Final alignment verification-no equalization

1.)

Connect a properly terminated TMS (receive) to the RX IN MON

jack and insert an opening plug into the RX IN in jack. Request

that personnel at the distant facility-side location send 1000Hz

tone at their specified level. Verify that tone is present and at the

level specified on the CLR card. (paragraph 3.20)

2.)

Disconnect the TMS and remove the opening plug. Connect the

properly terminated TMS (receive) to the RX OUT jack. Request

that personnel at the distant facility-side location again send

1000Hz tone at their specified level. Verify that tone is present

and record the level. (paragraph 3.20)

3.)

Determine the difference (in dB) between the measured receive

output level (step 2) and the receive output level specified on the

CLR. If any difference in levels exists, insert or remove gain via

their front-panel RX LEVEL switches to obtain the specified

receive output level. (paragraph 3.20)

4.)

Disconnect the TMS. Connect the properly terminated TMS

(receive) to the TX IN MON jack and insert an opening plug into

the TX IN jack. Request that personnel at the distant terminal-

side location send 1000Hz tone at their specified level. Verify

that tone is present and at the level specified on the CLR card.

(paragraph 3.21)

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Practice Section 104003C Rev A

BEAVERTON OR USA 503.641.0118

5.)

Disconnect the TMS and remove the opening plug. Connect the

properly terminated TMS (receive) to the TX OUT jack. Request

that personnel at the distant terminal-side location again send

1000Hz tone at their specified level. Verify that tone is present

and record the level. (paragraph 3.21)

6.)

Determine the difference (in dB) between the measured transmit

out-put level (step 5) and transmit output level specified in the

CLR. If any difference in levels exist, insert or remove gain via

the front-panel TX LEVEL switches to obtain the specified

transmit output level. (paragraph 3.21)

7.)

Remove all test connection. Alignment is completed.

Figure 8. Preliminary alignment procedure –with

equalization

1.)

Refer to the CLR card and determine the following: facility port

impedance, terminal port impedance, receive 1000 and 3000Hz*

input and output signal levels, transmit 1000Hz and 3000Hz*

input and output signal levels, and the distant (receive channel)

location's receive 1000Hz and 3000Hz* input signal levels. Once

the facility levels are known, proceed to step 2 and perform the

remaining preliminary alignment steps in numeric order. The

paragraph referenced after each step contains a more detailed

explanation of that specific procedure. After completing step 8,

proceed to the final alignment verification with equalization

procedure (Figure 9) for instructions on making end-to-end

measurements.

*If the 3000Hz signal levels are not specified on the CLR,

equalization and gain (steps 4 through 7) cannot be determined at

this time. After completing step 3, omit steps 4 through 7 and

proceed to step 8. After completing step 8, proceed to Figure 9.

2.)

Set S2 (Main Board) for facility port impedance. (paragraph 3.8)

3.)

Set S4 Main Board) for terminal port impedance. (paragraph 3.8)

4.)

If equalization is desired in the receive channel, refer to the CLR

card for the specified 1000Hz and 3000Hz receive input signal

levels. Determine the type of cable that the module interfaces,

and perform the appropriate equalization procedure, as described

below. (paragraph 3.13)



Loaded cable and predominately loaded mixed cable

Determine the difference (in dB) between the 1000Hz and

3000Hz signal levels. Divide this difference by 2 and,

referring to table 2, set front panel RX EQL switch for the

required (nearest but lower) amount of equalized gain.



Nonloaded cable

Determine the difference (in dB) between the 1000Hz and

3000Hz signal levels. Subtract 1.5dB from this difference

and, referring to table 2, set front panel RX EQL switch for

the required (nearest but lower) amount of equalized gain.



Predominately nonloaded mixed cable

Determine the difference (in dB) between the 1000Hz and

3000Hz signal levels. Subtract 2dB from this difference

and, referring to table 2, set front panel RX EQL switch for

the required (nearest but lower) amount of equalized gain.

5.)

Note: The amount of equalized gain added in step 4 must be

added to the specified 1000Hz receive input signal level to obtain

an equalized receive input level.

If the equalized receive input level is lower than the specified

receive output level, gain must be added. If it is higher, loss must

be added. Set front panel RX GAIN/LOSS switch to either GAIN

or LOSS, as required. To determine the required amount of gain

or loss, calculate the difference (in dB) between the equalized

January 2014

FAX 503.646.3903