Electrical Interface1 Sample Clauses

Electrical Interface1. 3.1 Input and OutputThe electrical interface shall conform to CCITT Recommendation G. 7C3 for twisted pairs at 204S kbit/s. The input impedance of 120 Ohm balanced is required. The output impedance is approximately 20 Ohms as specified in G. 703. This is necessary to meet the required pulse shape masks.1.3.2 AttenuationThe attenuation of the interconnecting. cable (including any digital distribution frame or interconnecting equipment) shall not exceed 6dB at 1024 kHz.1.3.3 InterferenceBoth input ports shall tolerate, without error, interference from anon-synchronous standard test signal (CCITT Recommendation 0. 151) ata level 18dB lower than the wanted signal.1.3.4 Multiplex CharacteristicsThe multiplex structure shall be in accordance with CCITTRecommendation G. 732, and Recommendations G. 704 and G. 705 andQ. 501 - Q. 517 for operation involving digital exchanges.1.4 SIGNALLINGChapter 5 of Recommendation G. 732 applies.1.4.1 Signalling ProtocolThe signalling protocol between the PLMN and the PSTN will initially beJitter and wander tolerance at input ports will be as per CCITT Recommendation 5.G. 823 (1984) for 2Mbit/s links on the PDH network and for links provided on coopercables with regenerators. It should be noted that the ports should be able to tolerate afrequency offset greater than 50ppm.1.4.2 Time Slot ZeroChapter 2 of Recommendation G. 732 applies. However, Telkom requires access toany one of the spare five bits in the frame alignment word as control signals forperformance monitoring equipment and the application of loops for maintenancepurposes. It should be noted that Telkom monitoring equipment will insert CRC4co-efficient into the appropriate bits of the CRC4 rnultiframe if this facility is notprovided by the terminal multiplexers. The spare bits of the CRC4 multi-frame aretransmitted transparently. To allow these facilities a frame structure complying withG. 704 is required and the use of an unframed 2Mbit/s link will not be acceptable as itwill prevent the previously mentioned monitoring.1.4.3 Fault Conditions and Consequent Actions me provisions of Recommendations G. 732, Q. 501 to Q. 517 shall be implemented bythe Parties.1.4.4 Channel Time Slot Encoding CHANNEL TIME SLOTS The 64 kbit/s channel time slots comprising the 2043 kbit/s stream shall carry 'A' law encoded information as defined in Recommendation G. 71 1.IDLE CHANNEL BIT PATTERNThe idle channel bit pattern in both directions shall be 01010100 (MSB at left handend) in accordanc...
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