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3.18.2 MCS-11 Repeater-to-Spur Daisy Chain Connection (J308/J309)
MCS-11 must be provisioned
MCS-11 J310 Master/Junction
to enable
XMT, RCV, and OUTPUT clocks. If an external modem is being used,
provision MCS-11 for
MCS-11 J310 Modem
. This selection disables
XMT, RCV,OUTPUT clocks and all MCS-11 clocks must now be pro
-
vided by the external modem.
Multiple radios at a site can be provisioned and connected to operate
using a common XMT and RCV clock. In this scenario, one radio is
provisioned to supply the clocks. All other radios are provisioned to
sync off the supplied clocks. Provision the radio supplying the clocks
J308 Output Clock
. Provision all other radios at the site
J308 Input
Clock
.
MCS-11 connectors J308 and J309 are typically used to sync radios at a site with multiple
radios configured as junctions, spurs, and/or daisy-chained spurs. The multiple radios are
connected to common XMT and RCV clocks. In this scenario, one radio is provisioned to
supply the clocks. This radio is designated “master” or DCE. All other radios at the site are
designed as “slave” or DTE and receive their sync from the master.
See Figure 3 - 29 for a typical connection scheme for three radios. Shelf 1 is the master
(DCE) radio. Shelf 1 is provisioned J308 Output Clock. Shelves 2 and 3 (slaves) sync to
Shelf 1 and are provisioned J308 Input clock. Either Repeater Shelf 1 or Repeater Shelf 2
may feed the spur shelf. The first connection out of the repeater must be crosswired from
J308 to J308. Then, every shelf from the spur must be wired 1:1, J309 to J308, in a daisy-
chain fashion.
3.18.2.1 Clock Master and Slave Modes
Clock direction is controlled by the MASTER/SLAVE control from the microprocessor.
Switching is controlled by the
CLK E DET control and the Master/Slave control from the
microprocessor. The master and slave modes are provisioned functions. The master mode is
set by provisioning the radio J308 Output Clock. The slave mode is set by provisioning the
radio J308 Input Clock.
Note
Note
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