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Operation
Table 3-2
SC 553 Network Configuration Option Settings (Continued)
Option
[6] Network Line Buildout:
Line Buildout is valid only
when Network Interface
Type is DS-1
[7] Network Pre-Equalization:
Pre-Equalization is valid
only when Network Inter-
face Type is DSX-1
[8] Network Tx Clock Source:
(DSU uses the timing
source selected by this
option as Transmit Timing
at the network interface,
Transmit Timing at the cas-
cade interface (if cascade
is installed), and as both
Transmit and Receive
Timing at the channel
interface.)
[9] Network Fallback Clock
Source:
[a] Network Ones Density:
[b] Network Inband Loopback
Type:
[c] Network AIS Loopdown
(Seconds):
[d] Network ESF Mode:
[e] Network FDL DCC:
3-12
0 dB (Default)
-7.5 dB
-15 dB
-22.5 dB
0-130 ft (Default)
130-260 ft
260-390 ft
390-5330 ft
530-655 ft
Receive – DSU recovers receive clock from T1 data it receives at the network
interface and uses that as its timing source (Default)
Internal – DSU itself provides the timing source
Station – DSU uses station clock supplied at lower RJ48 jack in Zone 1 of the
back panel as the timing source
Cascade – DSU recovers receive clock from T1 data it receives at the Cascade
Port and uses that as its timing source
External – DSU translates the clock taken from the Ext Clk signal provided by the
DTE and uses that as its timing source
Internal – DSU provides the send timing source for T1 data output to the net-work.
(Default)
Receive – DSU recovers receive T1 clock from the network receive T1 data and
uses it as the send timing source for T1 data output to the network
Cascade – DSU recovers receive clock from T1 data it receives at the Cascade
Port and uses that as its timing source
Disable (Default)
8*(n+1) – this selection valid only when AMI is the selected Line Code
Min 1 in 8
Payload Loop (Default)
Line Loop
None
Inhibit; Alarm Indication Signal (AIS) does not terminate loopbacks (Default)
05 – 60; number of seconds of AIS that causes termination of loopback test
None (Default)
ANSI T1.403 – compliance with ANSI network performance messages (per
Bellcore TR-TSY-000194), available only with ESF framing
TR 54016 – compliance with network maintenance messages per PUB 54016,
available only with ESF framing
Disable (Default)
Enable – DSU inserts the Diagnostic Communication Channel (DCC) for man-
agement of its remote in the Facilities Data Link (FDL) provided by ESF
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
Terminal Interface
Potential Settings
076R155-000
Issue 7
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