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(b) Maintenance Port Cable Assembly

HSD maintenance cable connections may vary in length, type of connection 
used, and pinouts—depending on the access point used.

The cable assembly for HSD transceivers assumes that the computer’s COM 
Port interface is a 9-Pin, D-Sub connector (DB9S). Cable assembly details for 
HSD transceivers are presented in Figure 4–2 and Figure 4–3. The cable 
assembly required for HSD-X transceivers is presented in Figure 4–4.

The maximum cable length, shown in Figure 4–2 and Figure 4–3, assumes 
that the length is measured from the ARINC 600 connector to the DB9 
breakout connector. 

Maint Port SGND

10

10

5

Maint Port Rx

12

12

3

1

1

2

Data Loader in A 

1

–

Reserved

Data Loader in B 

2

–

Reserved

Spare

3

–

–

Data Loader out A 

4

–

Reserved

Data Loader out B

5

–

Reserved

Spare

6

–

–

Data Loader Continuity Link (A)

7

–

Reserved

Maint Port TD 

8

Out

RS-232

Maint Port GND

9

GND

RS-232

Maint Port RD

10

In

RS-232

Data Loader Continuity Link (B)  11

–

Reserved

ATE Reserved

12

–

ATE

ATE Reserved

13

GND

ATE

ATE Reserved

14

–

ATE

ATE Reserved

15

–

ATE