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Chapter 3 Equipment Connection
I. Make sure E1 link cable matches the connected equipment.
If the equipment connected with RC interface converters in E1 link are comprised of such
equipment as PDH, SDH, etc., please refer to the manuals of these equipment for the type,
definition and line impedance of E1 interfaces.
II. Ordinary Application Solution
When the interface converter adopts all default settings, it provides one 75 ohm unbalanced
E1 interface, one Ethernet port that can be connected with switches with 10/100M
auto-negotiation ports or low cost HUB to provide 2048Kbps transmission bandwidth.
For adjustment of parameters of the equipment, please refer to instructions of dip-switches
in chapter 2.
III. Connect the interface converter with CAT 5 twisted pair cable, and please note that
the twisted pair cable shall be no longer than 100 meters.
The Ethernet port of this equipment supports auto MID/MIDX. It can be connected with
Ethernet ports of any equipment with either straight cable or crossover cable.
IV. When using the 120ohm balanced interface, the E1 link pins of the BALANCE-RJ45
twisted pair cable are defined as follows
PIN No. 1 2 3 4 5 6 7 8
Definition TD+ TD- NC NC RD+ RD- NC NC
Meaning Signal
Output+
Signal
Output-
Suspend Suspend Signal
Input+
Signal
Input-
Suspend Suspend
When the 120 ohm balanced connector is connected with other equipment, it’s necessary to
make clear definition for the pins of other equipment. The connection method of pins is as
follows
BALANCE-RJ45 of RC series converter E1 link equipment balanced connector
TD Signal Output
TD Signal Output
RD Signal Input
RD Signal Input
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