3-49
3.18.2.2 Master Mode (CLKS OUT)
See Figure 3 - 30 for a simplified block diagram of the master mode. The master mode sends
RCV and XMT clocks out to other equipment. Typically one radio at a repeater/junction is
provisioned J308 Output clock and this master radio provides the clocks on which other
radios at the site can sync. The east and west service channel modems on the controller
provide the XMT and RCV clocks. The east service channel modem provides the 64k CLK
E (64 kHz clock east) that is switched through the EPLD, amplified by the clock driver and
output through the bi-directional XCVR to connector J308. The west service channel
modem provides the 64k CLK W (64 kHz clock west) that is switched through the EPLD,
amplified by the clock driver and output through the bi-directional XCVR to connector
J308.
3.18.2.3 Slave Mode (CLKS IN)
See Figure 3 - 31 for a simplified block diagram of the slave mode. The slave mode receives
RCV and XMT clocks from other equipment. Typically all but one radio at a repeater/junc-
tion are provisioned J308 Input clock. The master radio provides the clocks on which the
slave radios at the site can sync. The RCV clock on J308 is passed through the bi-direc
-
tional XCVR, is switch through the EPLD, and output to the microprocessor as CLK 7. The
XMT clock on J308 is passed through the bi-directional XCVR, is switched through the
EPLD, and output to the microprocessor as CLK 8.
CROSSWIRED CABLE ASSEMBLY – Recommended connectorized cable assembly – PN
695-7837-001 through -005 (26 AWG 8 pair shielded, jacketed cable with 15-pin D-type
connector on each end). See
Figure 3 - 32 for shelf connectors J308 and J309 location and
pinout. Refer to Table 3 - 19 for J308 to J308 mating cable pinout and color code. See
Figure 3 - 29 for typical connection scheme.
DAISY CHAIN CABLE ASSEMBLY – Recommended connectorized cable assembly – PN
695-7837-021 through -025 (26 AWG 8 pair shielded, jacketed cable with 15-pin D-type
connector on each end, wired 1:1.) Refer to
Table 3 - 20 for J309 to J308 mating cable pinout
and color code. See Figure 3 - 29 for typical connection scheme.
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