ATL Telecom AM64/512 User Manual

Page 17

telecom

User Guide

High Speed Modems

10.1 General

Scroll up and down through the items with the ñ and ò keys. Set the item to the required value using
the SELECT key. Program the entire set of configuration options by using the PROGRAM key.
A star appears by any item that has been changed but not programmed. The yellow program LED should
be lit when there are any items in the menu that have been changed but not programmed.

10.2 Menu Items

10.2.1 Master / Slave working

10.2.1 Master / Slave working
When two BBM’s are connected together to form a link, one must always be set to Master while, the
other has to be set to Slave. The transmission signal is different for a Master and Slave, so line
synchronisation will never be achieved if two like types (e.g. Master to Master) are connected together.
The Config Menu options are ;

The Master and Slave setting allows the Slave settings to be controlled by the Master, whereas, the Ind.
Master and Ind. Slave settings have to be manually configured at each end of a link. i.e.: They are
Independent of each other.

10.2.2 HDSL Pairs

and on AM64/768 and AM64/1024 only

10.2.3 User Data Rate

This is dependent on the speed of modem purchased from 64/384K up to 64/1024K.

In steps of 64k

Note : If T/S Control Line operation is selected, the maximum data rate is not available (See 10.2.5).

10.2.4 Clock Source

When in Master mode the Config Menu display will show;

SS SS

1. The Internal mode sources the timing from the master unit’s own oscillator.
2. When the unit is operating in master mode the timing can be supplied from an external source.
3. The External mode accepts a clock at the bit or byte frequency.
When in slave mode the display will show (Note: This cannot be changed);

10.2.5 Control Line Operation

S S

The Control settings determine how the interface control lines 105 and 109 (C & I for X.21) are passed
end to end across the link. There are three options as shown above, these are ;
Controls EOC

The line states are passed in reserved bits in the Embedded Operation Channel

Controls Off

The line states are not passed at all from one end to the other.

C> Ind. Master

C> Slave Mode

C> Internal Clk

C> 1 Pair

C> Ext Bit Clk

C> Rate = 64K

C> Ext Byte Clk

C> Rate = 128K

C> Controls Off

C> Rate = XXXX K

C> Controls EOC

C> 2 Pairs

C> Line Clk

C> Ind. Slave

C> Master Mode

C> Controls T/S