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ACCURATE ELECTRONICS INC

WWW.ACCURATE.ORG

PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008



To provide a return path for sealing current applied from the far

end on the facility side, set to S6 to SINK.

Note 1: For instructions on setting S6 for a bypassed signaling arrangement,

see paragraph 3.10.

Note 2: When switch S6 is set to either SX, SINK, or SOURCE, switch S8 is

nonfunctional can therefore be left in either the REV or NORM position.

Terminal-Side Sealing-Current / SX-Lead Options

3.09 Switch S7 conditions the 104001C to supply internally generated 25mA

sealing current, to accept externally supplied sealing current from the far end

of the facility, or to derive normal simplex leads on the terminal side. Select

the desired terminal-side or sealing-current/SX-lead arrangements as follows:



For internally generated 25mA sealing current on the facility

side, set S7 to SOURCE.



To provide a return path for sealing current applied from the far

end on the facility side, set S7 to SINK.



For normal SX-lead derivation on the terminal side set S7 to SX.

Note 1: For instructions on setting S7 for a bypassed signaling arrangement,

see paragraph 3.10.

Note 2: When S7 is set to either SX, SINK, or SOURCE, Switch S8 is

nonfunctional and can therefore be left in either the REV or NORM position.

Bypassed Signaling

3.10 For bypassed signaling i.e., to provide a straight-through SX-lead

signaling path separate from the 104001C's transmission paths, set switches

S6, S7, and S8 as follows:

For a normal straight-through signaling path (RCV IN SX to RCV OUT SX

and XMT IN SX to XMT OUT SX), set S6 and S7 to BYP and S8 to

NORM.

For a reversed straight-through signaling path (RCV IN SX to XMT IN SX

and RCV OUT SX to XMT OUT SX), as required to compensate for

polarity reversals in DX-signaling and ground-start applications, set S6 and

S7 to BYP and S8 to REV.

Alignment

3.11 This alignment procedure is divided into three parts: gain adjustment,

output level adjustment, and equalization. The gain adjustment procedure

(paragraph 3.12) covers local prescription alignment for applications where

the circuit-layout record (CLR) transmission requirement is expressed in

terms of expected measured gain (EMG).

requirement is expressed in terms of transmission level points (TLP's), the

output level adjustment procedure (paragraph 3.013), which covers

composite prescription alignment of the circuit in which the module is used,

should be performed instead. If equalizer settings are not given on the CLR

or if the given settings do not adequately equalize the facility, frequency

response measurements should be taken and the module's equalizer set as

described in paragraphs 3.14 through 3.17. Because the equalizers do not

affect 1004 Hz transmission levels, equalization may be introduced after

transmission levels are set.

Gain Adjustment (for levels expressed as EMG)

3.12 If the CLR transmission requirement is expressed as EMG, proceed as

directed below. If the transmission requirement is expressed as TLP's,

proceed instead to paragraph 3.13.

Note: When the CLR transmission requirement is expressed as EMG, both

the transmit and receive portions of the transmission measuring set (TMS)

used for alignment must be optioned for 600 ohms.

Receive Channel:

Determine from the CLR whether gain or loss is required in the

receive channel, and set the front-panel RCV GAIN/LOSS switch to

GAIN or LOSS as appropriate.

Set all front-panel RCV LEVEL DIP switches for zero gain or loss,

i.e., to the OUT position.

If you have not already done so, insert the module into its mounting

and apply power.

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Practice Section 104001C Rev B

Transmit Channel:

Output Level Adjustment (for levels expressed as TLP's)

3.13 If the CLR transmission requirement is expressed as TLP's, proceed as

directed below. Please be aware that this procedure requires end-to-end

measurements.

Note: If the CLR transmission requirement is expressed as TLP's both the

transmit and receive portions of the local transmission measuring set (TMS)

must be optioned to match the impedance of the module ports to which they

are connected. If this is not possible due to the type of TMS available, re-

option the module to match the impedance of the TMS while alignment is

performed, and be certain to re-option the module appropriately after

alignment is completed.

If the CLR transmission

Receive Channel:

January 2014

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Determine from the CLR the amount of receive-channel gain or loss

(in dB) required. Call this amount G RCV.

Arrange the transmit portion of a TMS for 1004Hz tone output at a

–G RCV dBm level and for 600-ohm impedance and connect it to the

module's RCV IN jack.

Arrange the receive portion of the TMS for 600-ohm terminated

measurement and connect it to the module's RCV OUT jack.

Set to IN that combination of front-panel RCV LEVEL DIP switches

which adds up to the required amount of gain or loss, as verified by a

0dBm reading on the TMS.

Determine from the CLR whether gain or loss is required in the

transmit channel, and set the front-panel XMT GAIN/LOSS switch

to gain or loss as appropriate.

Set all front panel XMT LEVEL DIP Switches for zero gain or loss,

i.e., to the out position.

10. Determine from the CLR the amount of transmit channel gain or loss

(in dB) required. Call this amount G XMT.

11. Arrange the transmit portion of the TMS for a 1004Hz output at a

–G XMT dBm level and for 600-ohm impedance, and connect it to

the modules XMT IN jack.

12. Arrange the receive portion of the TMS for 600-ohm terminated

measurement, and connect it to the module's XMT OUT jack.

13. Set to IN that combination of front-panel XMT LEVEL DIP switches

which adds up to the required amount of gain or loss, as verified by a

0dBm reading on the TMS.

Set all front-panel RCV LEVEL DIP switches for zero gain or loss,

i.e., to the out position.

If you have not already done so, insert the module into its mounting

and apply power.

Arrange the receive portion of a TMS for terminated measurement at

the terminal-side impedance selected on the module (see note above),

and connect it to the module's rcv out jack.

Request personnel at the distant (facility-side) end of the circuit to

send 1004Hz tone at the CLR-specified level. Record the level

observed on the local TMS; this level is the receive input level

because the module is now optioned for zero gain or loss and no

equalization.

Refer to the CLR to obtain the required receive output level.

Determine the difference between the measured receive input level

and the required receive output level.

Depending upon whether gain or loss is required (as determined in

the preceding step), set the module's front-panel RCV GAIN/LOSS

switch to GAIN or LOSS as appropriate.

Then set to in that combination of front-panel RCV LEVEL DIP

switches which adds up to the difference determined in step 5, as

verified by a proper receive output level reading on the local TMS.

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