BANGLADESH TELECOMMUNICATIONS COMPANY LIMITED - BTCl

6.5.1 TGW shall provide (as a minimum) G.711 A-law, 723.1 and G.729 or G.729a, for theconversion of TDM voice to packet. The Bidder should indicate what packet sizes aresupported with which codec and what other codec are supported with what packet sizes.6.5.2 The Bidder must provide the BHCA capacity of individual Voice Processing Cards onthe TGW.6.5.3 Voice Activity Detection (VAD) with silence suppression and insertion of comfortnoise at far end (e.g. G.729a Annex B).6.5.4 The TGW shall provide Fax tones detection and transmission (T.38).6.5.5 The TGW should be able to deliver tones and announcements to connected TDM trunksunder instruction from the SS.6.5.6 Each of the deviation shall be treated as “Major Deviation”.6.6 Interface timing/clocking6.6.1 The TGW shall have stable and accurate clock. The stability and accuracy of the clockshall be as follows.ItemNetworkaccessparameters ofthe clockMinimum frequencyaccuracyPull-in rangeMaximum frequencyoffsetInitial maximumfrequency offsetSpecificationsStratum-3 clock: ±4.6 × 10 -6Stratum-3 clock: The precision can besynchronized to ±4.6 × 10 -6 .Stratum-3 clock: 5 × 10 -10 /dayStratum-3 clock:< 2.5 × 10 -8 /day6.6.2 Interface timing or clocking on TGWs shall have the flexibility to extract clock fromexternal sources.6.6.3 The internal clock used by the system shall be compliant to G.813 ITU-T standards.6.6.4 Each of the deviation of the above requirements shall be treated as “Major Deviation”.6.7 Reliability specificationsItemSpecificationsSystem availability in typical≥99.999%configurationMTBF≥100000 hoursMTTR≤ 0.8 hours (excluding the preparation time)Downtime< 5 minutes/yearRestart time< 10 minutesEach of the deviation of the above requirements shall be treated as “Major Deviation”.6.8 Present and Final capabilities of Trunk GatewayBook 2 :: Tender on Replacement of Old Telephones in Dhaka City Page: 37 of 153