RFL Communications 21 Sub-MUX Manual do Utilizador descarregar pdf (Página 8)

RFL SMX3 / 21 Page 8 of 22 Issue 1.4

User Manual

08 June 2009

7. Concatenation Port

The Concatenation Port provides optional direct connection to a co-located SMX3/21

that is serving another X.21 link. Unless interrupted by a particular V.24 port setting,

aggregate channel data passes between this port and the X.21 port. This port has

the same capacity as the X.21 Port. Signal timing is always transferred across the

Concatenation port when the port mode is set to ‘Enabled as Concatenation’.

The Concatenation Port is a DB15 female connector; this is connected internally to a

header on the PCB using a ribbon cable. The Concatenation Port may be configured

as DTE or DCE by fitting the ribbon cable to the appropriate X.21 Port Header, and

by selecting settings on DIP switch 5. Note: DTE is the standard header location

used for Aggregate Concatenation i.e. direct connection to a co-located

SMX3/21.

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

port connections are additionally protected by Tranzorb type arrays.

Aggregate Concatenation

Aggregate Concatenation is the interconnection at aggregate level of two co-located

SMX3/21 units. For this function the Concatenation Port is configured as Enabled as

Concatenation mode, (i.e. DTE with Timing X enabled). The timing signal is derived

from the port and is transmitted on pins 7 and 14 (Xa and Xb).

In installations where the X.21 aggregate that is connected to each co-located unit

receives timing from the network master clock, the clock source for both units should

be configured as X.21 Port.

In installations where the X.21 aggregate that is connected to one or both co-located

units do not receive timing from the network, the source of the timing signal must be

determined and the clock source for each unit should be configured as X.21 Port,

Concat Port or Master as appropriate (refer to DIP Switch 6 settings).

DIP switches provide configuration options, see section 10.

CONC. (DCE)

CONC. (DTE)

X.21 V24

Headers connected

to X.21 Port

Headers connected

to Concatenation

Port

Concatenation header locations

Header location used for

Aggregate Concatenation

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 21 22

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