描述 Description

The MT9079 is a feature rich E1 (PCM 30, 2.048 Mbps) link framer and controller that meets the latest CCITT and ETSI requirements.

The MT9079 will interface to a 2.048 Mbps backplane and can be controlled directly by a parallel processor, serial controller or through the ST-BUS.

Extensive alarm transmission and reporting, as well as exhaustive performance monitoring and error diagnostic features make this device ideal for a wide variety of applications.

特性 Features

? Meets applicable requirements of CCITT G.704, G.706, G.732, G.775, G.796, I.431 and ETSI ETS 300 011

? HDB3, RZ, NRZ (fibre interface) and bipolar NRZ line codes

? Data link access and national bit buffers (five bytes each)

? Enhanced alarms, performance monitoring and error insertion

? Maskable interrupts for alarms, receive CAS bit changes, exception conditions and counter overflows

? Automatic interworking between CRC-4 and non-CRC-4 multiframing

? Dual transmit and receive 16 byte circular channel buffers

? Two frame receive elastic buffer with controlled slip direction indication and 26 channel hysteresis (208 UI wander tolerance)

? CRC-4 updating algorithm for intermediate path points of a message-based data link application

Applications

? Primary rate ISDN network nodes

? Digital Access Cross-connect (DACs)

? CO and PABX switching equipment interfaces

? E1 add/drop multiplexers and channel banks

? Test equipment and satellite interfaces