RFL Communications 21 Sub-MUX Uživatelský manuál stáhnout pdf (Strana 16)

RFL SMX3 / 21 Page 16 of 22 Issue 1.4

User Manual

08 June 2009

DIP Switch 5 settings:

Switch 5 – X.21 Aggregate Channel and Concatenation Channel Enabling

8 7 6 5 4 3 2 1

Concatenation Port X.21 Port

Local Loop Spare Mode Local Loop Spare Mode

0 = Off

00 = Disabled

0 = Off

00 = Disabled

1 = On

01 = Enabled as DTE

1 = On

01 = Enabled as DTE

(Test only)

10 = Enabled as DCE

(Test only)

10 = Enabled as DCE

11 = Enabled as Concat

11 = Not used

• Mode: Disabled, Enabled as DTE, Enabled as DCE, Enabled as Concat (ie

DTE + Timing Signal X)

Enabled as DTE. This is the normal setting for the X.21 Port when connecting to X.21

links carrying network master clock timing (eg BT Kilostream)

Enabled as DCE. This optional setting is used when the X.21 link requires to be

synchronised to the network master clock signal received from a co-located

SMX3/21, (or to itself as master where network timing is unavailable). The timing

signal X is output on pins 6 and 13 (Sa and Sb). Timing must be selected

Enabled as Concat (ie DTE + Timing X). This is the normal setting for the

Concatenation Port when connecting to a co-located SMX3/21 using the Aggregate

Concatenation facility. The timing signal X is output on pins 7 and 14 (Xa and Xb).

• Local Loop: Off / On

Normally set to Off.

When set to On, data transmitted out of the MUX on the aggregate is looped back to

its Receive input. The clock is required for this to function.

The method of operation is the same for the X.21 Aggregate Port and for the

Concatenation Port.

- In DTE mode (normal operation) the clock is sourced from the network, so

the network connection must be present for the local loop to operate.

- In DCE mode the clock is sourced from the MUX so the local loop works

independently of the network connection.

- In Concatenation mode the clock is sourced from the unit at the opposite

end of the link, so an SMX3/21 must be present at each end of the

concatenation link.

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