RFL Communications 21 Sub-MUX Manual do Utilizador descarregar pdf (Página 10)

RFL SMX3 / 21 Page 10 of 22 Issue 1.4

User Manual

08 June 2009

8. X.21 Data Port (Channel A)

The port for Channel A is a DB15 female connector; it is configured as DCE.

Channel A Port Pin-out – D15F on chassis (DCE)

Circuit Pin A Pin B Direction Notes

T Transmit Data 2 9 Input

R Receive Data 4 11 Output

C Control 3 10 Input see Note below

I Indication 5 12 Output See Note below

S Signal Element

Timing

6 13 Output Timing signal transmitted

to network

G Ground 8 15

Screen / Drain

Must be earthed to shell

Transceivers are specified to ± 15kV IEC1000-4-2 air discharge ESD protection and

port connections are additionally protected by Tranzorb type arrays.

Data received at the Channel A port is always terminated; it cannot be concatenated

across the concatenation link.

S is normally synchronised to network timing but in the event of this being

unavailable runs from an internal source within the SMX.

Note:

When DIP SW 1-2 is 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 DIP SW 1-2 is 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.

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RFL Communications 21 Sub-MUX Manual do Utilizador Página 10