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COMSPHERE 3500 Series Data Service Units
4-24 January 1998 3510-A2-GN32-50
Table 4-6
(4 of 4)
Model 3510 DSU S4 Selection
Network
Address
Switch S4 Selection
Network
Address
654321
61 F F F F R F
62 F F F F F R
63 F F F F F R
64
1
R R R R R R
F = Front R = Rear
1
FACTORY DEFAULT SETTING (Broadcast Address)
DSU Strap Setting
Descriptions
The following information provides DSU strap setting
descriptions.
S1-1 and S1-2: Timing – The DSU comes from the
factory with digital data system (DDS) timing selected.
DDS timing is required when the DSU is connected to the
DDS network. Three other types of timing (receive,
internal and external) are available for LADS use.
S1-3: Circuit Assurance – When enabled, the DSU
does not turn on the DTE Clear-to-Send (CTS) interface
lead unless the CTS timing delay has expired and the
DSU receiver is getting a data signal from the network
(received line signal detector lead is on).
When disabled, the CTS interface lead turns on in
response to the Request-to-Send lead if there is a valid
data or control signal from the network.
NOTE
If the DTE Request-to-Send
(RTS) interface lead is ON, and
the DSU is not receiving a data
signal from the network, the DSU
sends a continuous MARK signal
to the network.
S1-4: DSR Normal during Local Loopback – DSR
ON during Local Loopback. When enabled, this strap
forces the DSR lead ON during a Local Loopback. This
allows DTEs that rely on DSR being on to send test
messages to the DSU.
When disabled, DSR is turned Off during a Local
Loopback.
S1-5: Elastic Store – When enabled, the DSU
compensates for small (3 bits) timing phase drifts that
may occur when the DTE interface of the DSU is
connected to the DTE interface of an analog modem to
provide an extended network. If you do not have an
extended network, place the strap in the disable position.
S1-6: Remote Digital Loopback Enable – When
enabled, the DSU responds to a front panel-initiated
Remote Loopback request from a remote DSU. When
disabled, the DSU ignores the Remote Loopback request.
NOTE
For nondiagnostic data over a
multipoint network, set this strap
on only one tributary DSU.