CANOGA PERKINS 2340 Universal Fiber Optic Modem - Manual (Page 18)

Model 2340 Model User Manual 3-4
Use the Internal configuration when the network equipment is set for Internal Timing (see Figure 3).
In this application, the modems act as the network timing source. When connecting KG or KIV
encryptors on the Black side, go to the Functional Configuration screen and set the interface
configuration parameters: set the operating mode to Internal, then set the Internal Rate, then set the
delay time; for details, see Section 4.7.
FIFO
RX Data
RX Clock
Delay Line
Internal
Clock
TX Clock
TX Data
RXD
SCR
SCT
SCTE
TXD
J1, DB-25
Figure 3. P53 Interface for Internal Clock
Use the External configuration when the network equipment is set for Network or Internal Timing
(see Figure 4). In this application, the modems act as an extension of the Red side cable in a true tail
circuit. When connecting KG or KIV encryptors on the Red side to a DTE device, go to the
Functional Configuration screen and set the interface configuration parameters: set the operating
mode for the modem at the Red end to External and the modem at the DTE end to Slave; for details,
see Section 4.7.
FIFO
RX Data
RX Clock
Delay Line
Internal
Clock
TX Clock
TX Data
RXD
SCR
SCT
SCTE
TXD
J1, DB-25
Figure 4. P53 Interface for External Function