Raisecom Technology Co., Ltd.
http://www.raisecom.com
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1.3.1 RC801-30B-FV35 Interconnection
RC801-30B-FV35 series standalone dual-strand fiber optic modem shall work in pairs.
1.3.2 Interconnection with Other Modems
It is not suggested to connect RC801-30B-FV35 with other brand name N*64kbps V.35 interface
fiber optic modems through optical link, but RC801-30B-FV35 can work with Raisecom’s other
dual-strand fiber optic modems.
Chapter 2. Recommended Connection Type
2.1 Precautions before Connection
2.1.1 Three Types of Timing Resource
Master Clock Mode: The timing resource is provided by the crystal oscillator inside the
equipment, also called Internal Clock.
Slave Clock Mode: The timing resource is provided by recovering the clock from the fiber
optic receiving link, also called Restoring Clock.
Terminal Clock Mode: The timing resource is provided by the DTE, also called System
Clock.
2.1.2 Compatibility
If RC801-30B-FV35 is connected with G.703 interface fiber optic modem, and then connected
with other brand name E1 fractional mode equipment (i.e. V.35 to fractional E1 interface converter,
E1 interface Router); or such equipment as DXC and MUX is serially connected in the E1 link,
the following requirements shall be noticed.
1.
PCM30/31 format must be the same
2.
The status of CRC enable/disable function must be the same
3.
The V.35 signal bandwidth engrossment of G.704 frame pattern must match
4.
Ensure that there is only one timing resource in the whole link. Other PCM equipment shall
be configured to Slave Clock Mode (following the link clock).
2.2 Basic Connection Type
The connection topologies introduced in this part is only for user reference. Users are advised to
