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T.O. 31W2-2GSC24-2
TM 11-5805-688-14-1
NAVELEX 0967-LP-545-3010
tandem and non-tandem applications which involve
3-58. SPECIAL DEMULTIPLEXER OUTPUT
SMOOTHING OPTIONS.
channel rates between 19.2 kbps and 1.5 Mbps, the
extended smoothing option need only be selected on
3-59. Rate variations and/or offsets appearing in digital
those SB cards which interface with the user's sink
channel inputs applied to the multiplexer are adjusted by
instrument.
a bit stuffing process as discussed in paragraph 5-30. At
the demultiplexer channel output, an inverse function
3-61. Extended smoothing interval options are provided
termed smoothing is performed (paragraph 5-64). Unlike
only on the SB card, since channel data rates processed
the stuffing operation, which makes an instantaneous 1-
by the TD card are below 19.2 kbps. The options are
bit adjustment in a channel's timing, the demultiplexer
selected by switch S12 on the SB card as follows: (1) if
smoothing process accomplishes a 1-bit output timing
the channel data rate is between 19.2 and 187.0 kbps
adjustment over an extended interval of channel bit
(within the B range of switch S5), switch S12 is set to the
times. The extended rather than instantaneous timing
B'A position; and (2) if the channel data rate is between
187.0 kbps and 3.0 Mbps (within the A range of switch
adjustment
is
necessary
to
ensure
proper
S5), switch S12 is set to the A' position. When a given
synchronization of sink instruments connected to the
multiplexer set application requires use of an extended
demultiplexer channel outputs.
smoothing interval option, appropriate supplementary
instructions should be added to the configuration
3-60. Smoothing circuits in the SB and TD cards are
worksheets that describe the configuration to the
designed to perform a 1-bit output timing adjustment
operator.
over an interval not exceeding 1000 channel data bit
times. However, the smoothing (or slew) rate may still
3-62. For those applications in which the demultiplexer
exceed the synchronization capabilities of certain sink
output smoothing rate must be confined more closely
instruments. For this reason, options are incorporated
than is possible with the options provided on the SB
on the SB card to enable extension of the smoothing
card, a narrow band smoothing buffer (NBSB) card is
interval for channel data rates between 19.2 kbps and
provided.  The NBSB card may be used for specific
3.0 Mbps.  More specifically, the options provide the
channel output data rates of 19.2, 38.4, 50.0, 76.8, or
following: (1) a smoothing interval of 1500 or more output
153.6 kbps .At each of these rates, the NBSB output
data bit times for channel data rates over the range of
smoothing interval is 20,000 data bit times for a 1-bit shift
19.2 kbps to 3.0 Mbps; and (2) a smoothing interval of
or slew in the card's output timing signal.
2000 or more output data bit times for a channel data
rate of 50.0 kbps.  The extended smoothing interval
3-63. When a particular application requires use of the
options are applicable for multiplexer channel inputs with
NBSB card, the letters NP are entered in the CARD
rate variations of plus or minus 250 parts per million
TYPE SB block on sheet 3 of the configuration
(+250 ppm) or less. Any SB card that is processing a
channel rate (Rc) of 1.5 Mbps or higher must have the
worksheets (figure 3-7)Thus the individual setting up the
extended smoothing option selected.
In all other
multiplexer set will be informed that the NBSB card
instead of a conventional SB card must be used.
3-28

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