Raisecom RC905-EE1 User Manual - page 5
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FDX(Green) When the Ethernet link is working on full duplex mode, it is on; in the half
duplex mode, when the collision occurs, it is flashing.
Power Indicators:
PWR(Green) When power supply is working properly, it is on.
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Definitions of the Interfaces
E1 Interfaces
TX BNC connector 75ohm unbalanced Port E1 signal output.
RX BNC connector 75ohm unbalanced Port E1 signal input.
BALANCE RJ-45 connector 120ohm balanced port 1st and 2nd pins for Output 5th
and 6th pins for Input.
NOTE: RJ-45 balanced port and BNC unbalanced port cannot be used in the same time. Please
set up by Dip-switch before using. The factory default setting is 75 ohm BNC.
Ethernet Interface
ETH: Ethernet Unshielded Twisted Pair port please see the port definition and Link method
in the following chapter.
II.
Product Parameters
1. Technical Specifications of E1 Interface:
Bit
Rate:
2048Kbps±50ppm
Line Code:
HDB3
Input Impedance:
75Ω(unbalanced BNC connector) , 120Ω(balanced RJ-45 connector)
Electrical Characteristics:
Compliant with ITU-T G.703 recommendation
Frame
Structure:
Compliant with ITU-T G.704 recommendation (this equipment
supports time-slot allocation)
Jitter Tolerance:
Compliant with ITU-T G.823 recommendation
Functions: Complete link alarm indication, Fault-Pass-Through (FPT), and intelligent
auto-restoration.
Note: When some other equipment such as PCM, DXC, etc., which need to modify the timeslot
0 of E1, are deployed along the transmission link, the loop-back control and remote-site alarm
interrogation capabilities will be disabled.
1. E1 Cable Type:
It is recommended to use SYV 75-2-2 cable with unbalanced BNC connectors. The
maximum transmission is about 200 meters.
For balanced RJ-45 port, 0.6mm (22AWG) Twisted Pair Cable is recommended.