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Installation and Setup
•
FDL DCC: in Network Configuration set Network Frame Type to ESF, Network ESF
Mode to ANSI T1.403 or TR54016, and Network FDL to Enable; in Channel
configuration set Channel Inband DCC Mode to None.
•
Embedded DCC: in Network Configuration set Network FDL to Disable; in Channel
configuration set Channel DS0 Format to N x 56 kbps, and Channel Inband DCC Mode
to Embedded.
•
DCC DS0: in Network Configuration set Network FDL to Disable; in Channel
configuration set Channel Inband DCC Mode to DCC DS0.
4.
Save the configuration. The master DSU automatically initiates the wake up procedure with
the remote DSU. The wake up procedure opens the DCC and sets the relevant config-uration
options at the remote to be compatible with the type of DCC selected at the master.
5.
Return to the Shelf Inventory screen. If the wake up procedure has been successful a + sign is
now displayed next to the slot number of the master DSU.
6.
Access the remote DSU and perform whatever configuration it requires to operate correctly in
the system. The wake up procedure only sets options in the remote that apply to DCC
operation, not those that apply to passing main channel data.
Preoperational Check
You should verify that the SC 553 DSU is in good working order by observing it during power up,
and then performing a Local Test with Self Test by means of the front panel controls.
When you insert the SC 553 DSU into the shelf all the front panel LEDs should light for
approximately one second. If this does not occur, there is a problem with the unit. Install a spare
unit if one is available. If you require assistance, contact VITAL Network Services at the toll-free
telephone number listed in the Preface of this manual. Do not attempt to repair the SC 553 DSU.
Local Test/Self Test
Once the SC 553 DSU has successfully powered up and before you connect it to its DTE or the
network, you should perform a Local Test with Self Test to verify that the internal circuits of the
DSU are capable of normal operation. Local Test causes the DSU to loop transmit data back as
receive data. Self Test enables both an internal Test Pattern Generator to provide a signal for the
test loop and a Test Pattern Checker to verify the signal.
1. Initiate the test by pressing the T1 (Local Test) switch on the front panel for two seconds
before releasing it. The T1 and TM (Test Mode) indicators are On during the test.
2. Run the test for approximately 15 seconds.
3. The TM indicator blinks when an error is detected. The test should run entirely error-free.
4. If the test is successful, the TM indicator remains On until you end the test by depressing the
T1 switch a second time.
If errors are detected during this test there is a problem with the unit. Install a spare unit if one is
available. If you require assistance, contact General DataComm Service at the toll-free telephone
number listed in the
076R155-000
Issue 7
Preface
of this manual. Do not attempt to repair the SC 553 DSU.
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
Preoperational Check
2-9
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