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REAR EDGE OF PC CARD
SELECT LOOP FOR CSU TO LOOP
SPAN POWER. (3 JUMPERS COVER
LOWER 3 PAIRS OF PINS.)
SELECT IN FOR CSU TO PROVIDE
POWER TO THE SPAN. (3 JUMPERS
COVER UPPER 3 PAIRS OF PINS.)
WHEN MASTER/SLAVE OR PMC-100 OPERATION IS SELECTED (PMC IS ON):
SELECT AN ADDRESS NUMBER BY TURNING ON THE COMBINATION OF AD0 THROUGH AD7 THAT
SEE
ADDS UP TO THE DESIRED ADDRESS NUMBER. EACH SWITCH HAS A VALUE, AS FOLLOWS: AD0
NOTE 3
= 1, AD1 = 2, AD2 = 4, AD3 = 8, AD4 = 16, AD5 = 32, AD6 = 64, AND AD7 = 128. ADDRESS 000 IS
ALL SWITCHES OFF; ADDRESS 255 IS ALL SWITCHES ON (REFER ALSO TO TABLE 2-1).
AD0
SELECT ON FOR UNFRAMED MODE (APPLIES
THRU
ONLY WHEN PMC-100 OPERATION IS DISABLED
AD7
(PMC IS OFF)). SELECT OFF FOR FRAMING AS
SELECTED BY NETD4, EQESF, AND MANF.
AD6
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
530
260
130
ALBO
15
7.5
LOR
A T T
FRONT
NOTE 1: OPTIONS ARE SELECTED AS SHIPPED FROM THE FACTORY.
PANEL
NOTE 2: THIS OPTION IS NOT AFFECTED BY CONFIGURATION FROM THE SUPERVISORY TERMINAL.
NOTE 3: REFER TO OPTION SELECTION FOR USE OF THIS SWITCH WHEN REPLACING AN OLDER
DataComm 551 WITH A NEWER ONE.
FIGURE 2-3. OPTION SWITCH AND JUMPER SELECTIONS (Sheet 1 of 2)
SELECT FG-SG FOR COMMON SIGNAL AND CHASSIS GROUNDS.
SELECT FG-100 FOR GROUNDS ISOLATED BY 100Ω RESISTOR.
IN
IN
PWR
TO
SPAN
LOOP
LOOP
530
SELECT LINE LENGTH FOR PRE-EQUALIZATION (EQUIPMENT SIDE), AS FOLLOWS:
260
0-130 FT 130-260 FT 260-390 FT 390-530 FT 530-655 FT
130
530
OFF
OFF
260
OFF
OFF
130
OFF
ON
ALBO
SELECT OFF FOR MANUAL LINE BUILD-OUT.
SELECT ON FOR AUTOMATIC LINE BUILD-OUT.
SEE
NOTE 3
WHEN MANUAL LINE BUILD-OUT IS SELECTED (ALBO IS OFF):
15
SELECT AMOUNT OF MANUAL LINE BUILD-OUT ATTENUATION, AS FOLLOWS:
7.5
0 dB 7.5 dB 15 dB
15
OFF
OFF
ON
7.5
OFF
ON
N/A
LOR
SELECT OFF TO DISABLE LOCAL OPTION OVERRIDE.
SELECT ON TO ENABLE IT.
SEE
NOTE 2
SELECT OFF FOR ANSI COMPATIBILITY.
SELECT ON FOR AT&T.
ATT
SELECT ON FOR TRANSCODING (APPLIES
ONLY WHEN PMC-100 OPERATION IS
DISABLED (PMC IS OFF)). SELECT OFF
FOR LINE CODE AS SELECTED BY B8ZS.
AD7
OFF
OFF
ON
ON
ON
N/A
OFF
OFF
ON
N/A
OFF
INSTALLATION
2-11
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