User's Manual

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 34
4.2.4 Balanced Payload Data : DB25
1. Assemble the (nE1) / (nT1) payload data input and output cable. See the table
below for Indoor Unit connector pin assignments.
2. Connect the payload data cable to the DB25 connector on the front panel of the
Indoor Unit.
Standard termination of this port is 120 Ohms. On the Orion 25, 75 Ohms termination
is available on request (please contact the factory).
NOTE Rx implies IN (signal expected to go INTO the interface), Tx implies OUT
(signal coming out of the interface)
Tribs 1-4 are connected on D1 on the Orion 25 and MDR IU. In a similar fashion tribs
5-8 are connected on D2 for the Orion 25 radio, that is pin 2 = RTIP6, pin 10 = RTIP5
and so on.
D-Type Payload Data
Connector Pin #
Pin Name Tributary Direction
1
GND / Earth N/A
2
RTIP2
2
RX +
3
RRING2
2
RX -
4
GND / Earth N/A
5
TTIP2
2
TX -
6
TRING2
2
TX +
7
GND / Earth N/A
8
GND / Earth N/A
9
RRING1
1
RX +
10
RTIP1
1
RX -
11
GND / Earth N/A
12
TRING1
1
TX -
13
TTIP1
1
TX +
14
TRING3
3
TX -
15
TTIP3
3
TX +
16
GND / Earth N/A
17
RRING3
3
RX+
18
RTIP3
3
RX-
19
GND / Earth N/A
20
TTIP4
4
TX-
21
TRING4
4
TX+
22
GND / Earth N/A
23
RTIP4
4
RX+
24
RRING4
4
RX-
25
GND / Earth N/A