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Operation
Table 3-3
SC 553 Channel Configuration Option Settings (Continued)
Option
[6] Channel Split Timing
[7] Channel Respond RDL:
[8] Channel Inband DL Timeout
[9] Channel Data Invert
[a] Channel Clock Invert
[b] Channel Auto Clock Invert
[c] Channel Constant DCD:
[d] Channel Constant DSR:
[e] Channel Constant CTS:
[f]
Channel EIA Test Leads
[g] Channel Routing:
[h] Channel Redundancy
3-14
Disable – DSU uses selected Network TX Timing to clock T1 transmit
data and channel send data (Default)
Enable – DSU uses selected Network TX Timing to clock T1 transmit
data, and uses the Ext Clk signal provided by DTE to clock channel
send data
PN127 – DSU accepts the PN127 Remote Digital Loop test
command (Default)
Disable – DSU cannot be commanded into Remote Digital Loop test
Disable (Default)
10 mins
Tx Normal, Rx Normal (Default)
Tx Invert, Rx Normal
Tx Normal, Rx Invert
Tx Invert, Rx Invert
Tx Normal, Rx Normal (Default)
Tx Invert, Rx Normal
Tx Normal, Rx Invert
Tx Invert, Rx Invert
Disable (Default)
Enable – DSU monitors for data/clock misalignment in DTE data, toggles
automatically between Normal and Invert conditions to compensate
for detected misalignment conditions
Disable – DCD ON while DSU is in data mode (not blocked by alarm
condition or diagnostic mode) (Default)
Enable – DCD forced ON
Disable – DSR ON while DSU is ready to accept data (not blocked by
diagnostic mode) (Default)
Enable – DSR forced ON
Disable – CTS follows RTS (Default)
Enable – CTS forced ON
Disable – DTE Test Leads LL and RL disabled (Default)
Enable – DTE Test Leads LL and RL enabled
Network – channel data from DTE is directed to the network interface
(Default)
Cascade – channel data from DTE is directed to the Cascade Port
interface
Disable – Channel Redundancy feature Off – DSU always transmits and
receives channel data by the T1 interface selected by the Channel
Routing option (De-fault)
Enable – Channel Redundancy feature On – DSU transmits and
receives channel data by the T1 interface selected by the Channel
Routing option while that link is available, automatically redirects data
through the other T1 interface if the configured link malfunctions.
Consult
Figure 1-1
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
Terminal Interface
Potential Settings
for an illustration of how this feature operates.
076R155-000
Issue 7
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