ACCURATE ELECTRONICS INC
Practice Section 104003C Rev A January 2014
PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX 503.646.3903
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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)
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