Black Box Multi-Function Line Driver Spécifications télécharger pdf (Page 24)

CHAPTER 4: Installation

4.2.2 C

ONNECTING THE

MFLD

TO A

DCE D

EVICE

Because the Multi-Function Line Driver is wired as a DCE device, you can’t

plug it directly into another DCE (modem, multiplexor, etc.) device. If you

must make such a connection, use a null-modem cable pinned according to

Table 4-3 below. Because the MFLD is interface-powered, this cable should

be as short as possible (we recommend 6 ft. [1.8 m] or less).

NOTE

When you connect the Multi-Function Line Driver to another DCE device,

you should configure the MFLD for the “external” clock source (see the

entry for SW1 Positions 5 and 6 in Section 3.2).

Table 4-3. Pinout for a Null-Modem Cable

Conecting the MFLD to Another DCE

MFLD End: DCE End:

DB25 Male DB25 Male

Pin No. Pin No.

1-------------------------------------------------1

2-------------------------------------------------3

3-------------------------------------------------2

4-------------------------------------------------8

6------------------------------------------------20

7-------------------------------------------------7

8-------------------------------------------------4

17-----------------------------------------------24

20------------------------------------------------6

24-----------------------------------------------17

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 33 34

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Black Box Multi-Function Line Driver Spécifications Page 24