Adtran 550 Guia Do Utilizador

Section 2  Engineering Guidelines

ATLAS 550 System Manual

 44

© 2004 ADTRAN, Inc.

61200305L2-1B

The NxT1 HSSI Option Module uses a single 50-pin SCSI-II interface to combine up to eight T1s of data 
(four from the NxT1 HSSI Module T1 ports and four from other T1 ports installed in the system). Table 26 
gives the pinouts for the SCSI-II connector, and Table 28 on page 45 gives the pinouts for the RJ-48C (T1) 
connector.

V.35 is possible with the NxT1 HSSI Option Module with an appropriate adapter cable (ADTRAN 
P/N 3125I081@A); however, some HSSI menu options will be unavailable in this mode (for details, see 
the User Interface Guide section). Table 27 and Table 28 on page 45 give the pinouts for the V.35 and 
RJ-48C (T1) connectors, respectively.

1

26

SG - Signal Ground

10

35

LA - Loopback Circuit A

2

27

RT - Receive Timing

11

36

SD - Send Data

3

28

CA - DCE Available

12

37

LB - Loopback Circuit B

4

29

RD - Receive Data

13

38

SG - Signal Ground

5

30

LC - Loopback Circuit C

14-18

39-43

Ancillary to DCE (Reserved)

6

31

ST - Send Timing

19

44

SG - Signal Ground

7

32

SG - Signal Ground

20-23

45-48

Ancillary to DTE (Reserved)

8

33

TA - DTE Available

24

49

TM - Test Mode

9

34

TT - Terminal Timing

25

50

SG - Signal Ground

1

26

—

HSSI SG - Signal Ground

2

27

O

HSSI RT - Receive Timing

3

28

O

HSSI CA - DCE Available

4

29

O

HSSI RD - Receive Data

5

30

O

HSSI LC - Loopback Circuit C

6

31

O

HSSI ST - Send Timing

7

32

—

HSSI SG - Signal Ground

8

33

I

HSSI TA - DTE Available

9

34

I

HSSI TT - Terminal Timing

10

35

I

HSSI LA - Loopback Circuit A