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MH88622-1 Datasheet(PDF) 7 Page - Mitel Networks Corporation |
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MH88622-1 Datasheet(HTML) 7 Page - Mitel Networks Corporation |
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7 / 10 page  Preliminary Information MH88622 2-179 Functional Description The SLIC uses a Transformerless 2-4 Wire converter for each subscriber which can be connected to a CODEC to interface the 2-Wire subscriber loop to a time division multiplexed (TDM), pulse code modulated (PCM), digital link. Powering of the subscriber line is provided through precision battery feed resistors on the hybrid. The thick film hybrid circuit contains control, signalling and status circuits which combine to provide a complete solution simplifying the manufacture of line cards. Approvals FCC part 68, CCITT, DOS CS-03, UL 1459, CAN/ CSA-22.2 N0. 225-M90 and ANSI/EIA/TIA-464-A are system level safety standards and performance requirements. As a component of a system, the MH88622 is designed to comply with the applicable requirements of these specifications. Battery Feed The SLIC is designed for a nominal battery voltage of -48 Vdc and can provide the constant feed current for 1500 Ω loop under this condition. The interface circuit is designed to be operated up to a maximum of -60V dc battery feed voltage without damage, providing a minimum loop length capability of 2000 Ω. There is also a function on the SLIC that provides for Tip-Ring reversal. Current Limit Primary over current protection is inherent in the current limiting feature of the battery feed circuit. Current limiting is provided for both Tip and Ring unbalanced conditions. The maximum loop current limit is set internally on the interface and current limiting does not affect the longitudinal or the signal balance of the device. To set ILoop to 40mA tie the LCS pin high (Logic 1), to set ILoop to 25mA the LCS pin may be left open circuit or tied low (Logic 0). Two Wire Port Termination Impedance The Tip/Ring impedance (Zin) is fixed for each variant. Transmit and Receive Gain The transmit and receive gain of the MH88622 is internally set. Internal Ringing Generator The MH88622 offers an on board ringing generator requiring only two external passive components and a DC voltage source to produce a sine wave of between 17Hz to 68Hz. An internal signal is amplified by a user programmed amount and is applied to Tip and Ring. The programmable gain must be set using RGV and RG1 to ensure that distortion of the ringing signal is minimised. With VBAT = -48Vdc and VDCRI = +120Vdc and the ringing voltage = 90Vrms RGV and RG1 should be left open circuit. By adding an external resistor between RGV and RG1 it is possible to reduce the ringing voltage applied by the driver section to Tip and Ring. The DC voltage source should be continuously applied to the MH88622. The ringing voltage will only be applied when the RC pin of the relevant subscriber is activated. Table 1 - Ring Generator Capacitor Selection 12-16kHz Meter Pulse The MH88622 provides control of an external signal path to the driver. A 12/16 KHz continuous signal should be applied to the ESI pin. Control of the ESE input allows the metering signal to be transmitted to the line with a ramped up and down amplitude to reduce noise on the line. Typical ramp time is 10mS. Typ. Frequency (Hz) CF1, CF2 (nF) 17 100 25 68 35 47 50 33 |
Similar Part No. - MH88622-1 |
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Similar Description - MH88622-1 |
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