User Manual

MDR2400/5800-SR, Orion2410/5810-SRi and Orion 5825-SR
862-01881 Issue 12c Page 33
4.2.4 Balanced Payload Data : DB25
1. Assemble the (nE1) / (nT1) payload data input and output cable. See the table
below for Digital Indoor Unit connector pin assignments.
2. Connect the payload data cable to the DB25 connector on the front panel of the
Digital 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 RFUT
(signal coming out of the interface)
Tribs 1-4 are connected on D1 on the Orion10, Orion25 and MDR DIU. 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