Comtech EF Data RCS10 - Manual (Page 45)

Page A-13
2.5 External Reference Card Section
The External Reference Card plugs into slot 10 on the rear of the RCS10 (refer to Figure 2-3). The
External Reference module has one external IF reference input which is distributed to all ten DMD10
modems. Each modem’s on-board system oscillator can be individually locked to the external
reference.
Additionally, the external reference module can be equipped with a 10 -7 high stability reference
oscillator that is distributed to all ten DMD10 modems providing a low-cost high-stability option. An
External IF Reference Output (J2) is also provided for distribution to other equipment.
Also, the external reference has one BNC clock input (J3) that is distributed to all ten modems.
Each modem control can independently select this external clock as its TX clock and/or RX buffered
clock source. The connections and descriptions are as follows:
J1 - EXT IF REF IN (BNC)
J1 provides an input for external clocking that can be selected by a particular modem (1-9). A
modem selecting this external clock will then lock its IF circuitry to this signal.
J2 - EXT IF REF OUT (BNC)
J2 provides a clock reference output that may either be the same as the input to J1 discussed
above or the onboard RCS10 high-stability reference.
J3 - EXT BNC CLK IN (BNC)
J3 is the External BNC Clock Input that can be selected by a particular modem (1-9) for data
clocking.
J4 - Remote RS485 I/O (9-Pin Female ‘D’)
J4 is the Remote RS485 I/O port. See Table 2-8 for the connector pinouts.
J5 - Remote Terminal Port (9-Pin Female ‘D’)
J5 is the RSC10 Remote Terminal Port. See Table 2-9 for the connector pinouts.
J6 - System Fault Summary Relays (15-pin Female ‘D’)
J6 is the System Fault Summary Relays connector. See Table 2-10 for J6 connector pinouts.
J7/J8 - Optional Remote Ethernet Connections - J8/10BASE-T (Twisted pair), J7/10BASE-2
Coaxial Transceiver Interface. See below for a description of these interfaces.
2.5.1 Ethernet Interface
With the Ethernet option installed, the software will sense its presence and enable the
corresponding display states. The user can select from three different cabling options: 10BASET,
10BASE2 and 10BASE5. The node ID address, the Ethernet chip operating modes, and the
configuration and initialization settings are user-selectable.
Only the 10BASET interface and the TCP/IP protocol are available with the basic Ethernet option.
10BASE2 and 10BASE5 cabling options, UDP/IP and Remote Terminal protocols, and TFTP,
TELNET, BOOTP servers are options.