SDM-9220/9230 - Comtech EF Data
SDM-9220/9230 - Comtech EF Data
SDM-9220/9230 - Comtech EF Data
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<strong>SDM</strong>-<strong>9220</strong>/<strong>9230</strong> Hardware Installation Guide<br />
4.6 Hardware Strapping<br />
4.6.1 NT/TE Mode<br />
On the ISDN-BRI S/T interface card, the directionality of the clock signals is set to NT<br />
(Network Termination) or TE (Terminal Equipment) mode through hardware strapping.<br />
NOTE: NT/TE mode is software selectable on the single/dual T1/E1 interface cards.<br />
• In NT mode, the interface provides the clock signal to the connected device.<br />
• In TE mode, the interface uses the receive clock from the connected device to<br />
transmit data. This is the factory default setting.<br />
The two ends of a T1 or E1 connection must have opposite NT/TE values. Thus some digital<br />
interface cards in your application may need to be changed to NT mode. The rule of thumb<br />
is:<br />
• If you are connecting the physical digital port directly to the network (or to<br />
another physical digital port that has been strapped as NT), you do not need to<br />
change the TE factory setting.<br />
• If you are connecting the physical digital port to user equipment (or to another<br />
physical digital port that has been strapped as TE), you must change the NT/TE<br />
mode of the interface card to NT.<br />
4-10 Memotec Inc.
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