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TABLE 2-1. OPTION APPLICATION NOTES (Cont.)
Option
Selection
Inband Loop-
Unframed
back Code
Framing
Framed
Ones Density
15 zeros
39 zeros
Supervisory
4 rates, from
Port Baud Rate
2400 bps to
19.2 kbps
PMC-100
Disabled
(or MAU-1A)
Operation
Enabled
Supervisory
Various
Port Character
(see Fig. 2-3)
Format
Master/slave
Master CSU
CSU operation
Slave CSU
Inhibit Front
Disabled
Panel Test
Enabled
Switches
Inband Loop-
Enabled
back Code
Detection
Disabled
Pre-equaliza-
0 to 655 feet, in
tion
5 ranges
Line Build-Out
Manual
Automatic
Manual Line
0 dB, 7.5 dB,
Build-Out
and 15 dB
Local Option
Disabled
Override
Enabled
Switch (S) or
Jumper (X)
Position
S5-7
OFF *
S5-7
ON
S5-8
OFF *
S5-8
ON
S6-1
Various
S6-2
(see Fig. 2-3)
S6-3
OFF *
S6-3
ON
S6-4
Various
S6-5
(see Fig. 2-3)
S6-6
OFF *
S6-6
ON
S6-7
OFF *
S6-7
ON
S6-8
OFF *
S6-8
ON
S7-1
Various
S7-2
(see Fig. 2-3)
S7-3
S7-4
OFF *
S7-4
ON
S7-5
Various
S7-6
(see Fig. 2-3)
S7-7
OFF *
S7-7
ON
Description
DataComm 551 sends unframed inband loopback
codes.
DataComm 551 sends framed inband loopback
codes.
Allows a maximum of 15 consecutive zeros to be
sent toward the network.
Allows a maximum of 39 consecutive zeros to be
sent toward the network.
Selects the baud rate for the Supervisory port.
Factory default is 9600 bps (both switches OFF).
Disables use of PMC-100s or MAU-1As (disables
the internal RS-485 bus and enables the Supervi-
sory port).
Enables use of PMC-100s or MAU-1As (enables the
internal RS-485 bus and disables the Supervisory
port).
Selects the character format for the Supervisory
port. Factory default is 8-bit data word, no parity,
and one stop bit (both switches OFF).
Defines the CSU as a master CSU (allows
configuration via the Supervisory terminal).
Defines the CSU as a slave CSU (prevents
configuration via the Supervisory terminal).
Allows use of the front panel test switches.
Inhibits use of the front panel test switches.
Enables detection of inband loopback codes
(framed or unframed). Select test type with S5-6.
Disables detection of inband loopback codes.
Matches the equipment-side line length, providing
transmitter pre-equalization. Factory default is for
0-130 feet (all switches OFF).
Selects manual Line Build-Out (attenuation of signal
transmitted to the network). Use S7-5 and S7-6 to
manually select amount of attenuation.
Selects automatic Line Build-Out. Do not enable
automatic Line Build-Out for both CSUs when
they are connected back-to-back.
Matches transmitter to network gain characteristics
(when S7-4 is ON). Factory default is 0 dB (both
switches OFF).
Supervisory terminal selections override option
switch selections.
Option switch selections override Supervisory
terminal selections.
INSTALLATION
2-7
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