RFL Communications 21 Sub-MUX Manual do Utilizador descarregar pdf (Página 14)

RFL SMX3 / 21 Page 14 of 22 Issue 1.4

User Manual

08 June 2009

DIP Switch 1 settings:

SW 1 X.21 Data Channel A Configuration

8 7 6 5 4 3 2 1

Bandwidth

Not

Used

Always

set to 0

Not

Used

Local Loop Indicate Port Enable

00 = 64K 0= Off 0= Local 0= Off

01 = 128K

1= On

(Test only)

1= Remote 1= Enabled

10 = Not Used (See Note

11 = Not Used Section 8)

• Bandwidth

Set to 64kbit/s, or 128kbit/s if permitted by the speed of the aggregate (refer to table in

section 5).

•

Local Loop Off / On.

Normally set to Off

When set to On, data transmitted into of the MUX TxD is looped back to its RxD output.

Channel A requires the clock to be present; as this is a DCE port the clock is sourced

from the MUX; provided this is present local loop operation is always possible.

• Indicate

When set to Local, I is ON when the channel is legally configured, the aggregate is

running and in sync, in which case C is ignored

When set to Remote, I is ON when the channel is legally configured, the aggregate is

running and in sync, and C is received from the remote end

• Channel Enable.

Set to On to enable Channel A X.21 Data Channel

X.21 Aggregate Channel

SMX3-21

TxD

RxD

DCE

MUX

Data Channels

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20 21 22

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