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Configuration Options
C-153160-A2-GB21-50 January 1997
General Configuration Options
Table C-6
(1 of 2)
General Configuration Options
Gen Yellow: Enab
Next Enab Disab Prev
Generate Yellow Alarm Signals. Determines whether the DSU/CSU generates Yellow Alarm signals on the network and
DTE Drop/Insert (DSX-1) interfaces.
NOTE: This configuration option is not available for 1-port DSU/CSUs or if the DTE Drop/Insert (DSX-1) Interface is
disabled. If the DTE Drop/Insert (DSX-1) interface is disabled, the DSU/CSU always generates the Yellow Alarm
signal on the network interface.
Enab – Generates the Yellow Alarm signal for both the network and DTE Drop/Insert (DSX-1) interfaces.
Disab – Disables the Yellow Alarm signal. When this configuration option is disabled, Yellow Alarm conditions on the
network interface cause an AIS signal to be transmitted on the DTE Drop/Insert (DSX-1) interface.
NOTE: When this configuration option is disabled, the DTE equipment connected to the DTE Drop/Insert (DSX-1)
interface is responsible for generation of the Yellow Alarm signal on the network interface. In this case, the
interface port marked DTE must only be connected to an FCC Part 68 Registered (for USA) and Canadian DOC
Certified (for Canada) Digital Service Unit or System, such as PBX, with a DTE Drop/Insert (DSX-1) interface.
Failure to do so is a violation of FCC Rules or DOC Regulations.
Clock Src: NET
Next NET DTE Prt1 Int Ext Prev
DSU/CSU Clock Source. Specifies the master clock source for the DSU/CSU. This selection synchronizes all internal
timing and external interface clocks. The clock rate(s) for the external timing interfaces are independent of the input rate
for the master clock. Failure of the clock specified by the Clock Source selection results in automatic fallback to internal
clock.
NET – Configures the network interface as the master clock source.
DTE – Configures the DTE Drop/Insert (DSX-1) interface as the master clock source. This selection is not available for
1-port DSU/CSUs or if the DTE Drop/Insert (DSX-1)
interface is disabled. If the DTE Drop/Insert (DSX-1) interface is
disabled after making this selection, the master clock source is changed to NET.
Prt1 – Configures data port 1 as the master clock source. This is the only synchronous data port you can use for the
master clock. If you enable EDL if for Port 1 and the DSU/CSU Clock Source is set to Prt1, the external device must
provide clocking of 8 kbps less than the expected data port rate. For example, if you select 64 kbps, the external clock
must supply a 56 kbps clock signal.
Int – Configures the internal clock as the master clock source.
Ext – Configures an external clock (provided through the Clock In connector) as the master clock source. This selection
is only available on 2-port and 4-port DSU/CSUs.
Clock Rate: 1544
Next 2048 1544 8 Prev
External Clock Rate. Specifies the clock rate when the master clock source is configured for external clock (Ext). This
configuration option does not appear when the clock source is not an external clock.
2048 – Sets the input rate of the external clock to 2,048 kHz.
1544 – Sets the input rate of the external clock to 1,544 kHz.
8 – Sets the input rate of the external clock to 8 kHz.
NOTE: This configuration option is only available on 2-port and 4-port DSU/CSUs.
NOTE: External clock rate 2,048 kHz does not imply E1 compatibility.