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Installation and Setup
Table 2-3
SC800 T3 Card Options (Shown in Factory Default Settings)
Location
Function
X3
Selects active or backup
versions of downloaded
firmware.
S1-1
Selects the operation of
the DSU as a master or
remote device.
S1-2
Sets the Frame Format
for compatibility with the
device at the other end of
the T3 line.
S1-3
Selects Cable Length
S1-4
Selects Timing
Special Considerations
When the DSU is in a shelf with an SCM and S1-1 is set to OFF, the DSU operates as a master unit
and will not migrate to remote mode. If an SCM is not detected in the shelf and S1-1 is set to OFF,
the DSU operates as a remote unit.
When the DSU is in a SC 5000 shelf and S1-1 is set to ON, the DSU operates as a remote unit. The
backplane is enabled and the Craft port is directed to the DTE connector.
When the DSU is in a SC 2000 shelf and S1-1 is set to ON, the DSU operates as a remote unit. The
backplane is disabled and the Craft port is enabled.
2-4
1
ON
OFF
X3
1
Note: ALL S1 OPTIONS ARE SHOWN
IN THE DEFAULT (OFF) POSITION.
Option
To force the card to run the backup firmware, set the jumper to the opposite
position to what it was the last time the card was powered up.
OFF (Default)
Remote Only: The shelf backplane is enabled and the Craft
port is disabled (see Special Considerations below) .
ON
Remote Only Disabled: Inband management supported
(see Special Considerations below)
OFF (Default)
C-bit Parity
ON
M13 (Inband management not supported)
OFF (Default)
Short: use this setting for 0-100 ft cables.
ON
Long: use this setting for 100-450 ft cables.
OFF (Default)
Recovered: derives transmit T3 timing from the recovered T3
timing. Use this setting for connections to a T3 network.
ON
Internal: generates transmit T3 timing from an internal
oscillator. Use this setting on one end of a back-to-back link.
SpectraComm 800 T3 Data Service Unit
Installation and Operation Manual
S1
2
3 4 5
6
7
8
076P015-001
SC800 T3
Action
NTWK INTFC
XMT
RCV
D
T
E
I
N
T
F
C
800 T3
076R160-000
Issue 4
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