Zhone Technologies Network Device manual Model 8905 Power Supply, 120/240 VAC, Ring Generator

Zhone Technologies, Inc.		IMACS Product Book, Version 4
	Model 8905 Power Supply, 120/240 VAC
	Input Voltage	90 Vrms to 260 Vrms
	Input Frequency	50/60 Hz
	Output Power	100W max
	Output Voltage	-48.0 VDC
	Output Current	2 amp
	Maximum Number per system	2
	Redundancy	Optional
	Ventilation	Convection cooled
	Approvals	UL 1459, UL 1950, CSA-C22.2 No.950, CE Mark
	Model 8908 Power Supply, 105/240 VAC
	Input Voltage	90 Vrms to 260 Vrms
	Input Frequency	50/60 Hz
	Output Power	300 W max
	Output Voltage	-48.0 VDC
	Output Current	6.25 amp
	Maximum Number per system	2
	Redundancy	Optional
	Ventilation	Forced Air, (120mm Fan)
	Approvals	UL 1459, UL 1950, CSA-C22.2 No.950

Ring Generator

Ring generators are required to supply ringing current whenever there are Foreign Exchange Station (FXS) Cards operating in the unit or if there is one or more Foreign Exchange Office (FXO) ports that are used in Manual Ring Down (MRD) mode.

•The current ring generator model is: Model 890620

Model 890620,the internal ring generators, will support up to 24 simultaneously ringing phones. Additional ringers can be added depending on the chassis and application, (see table 5). The exact number of simultaneously ringing subscriber lines supported is a function of the Bell Ringer Equivalency Number (REN) of the attached devices and the loop impedance. The user may attach an external ring generator to the IMACS terminal block location marked RGR.

The model 890620 is an enhanced version of the current 8906 ring generator. This model has improved operating efficiency and inrush current limiting.

Table —Ring Generator Specifications

	Model 890620 Ringing Generator
	Input Voltage		42 to 57 VDC, linear = 0.84 max.
	Efficiency		57% at 48 V and 1 kOhm load
	Protection		5 A slow blow fuse, primary current limiting
	Noise		Less than 32dBrnc
	Output Voltage		100 VDC rms default – adjustable from 60 to 105 Vrms
	Output Current		160 mA RMS continuous, 230 mA RMS cadence
	Output Frequency		20 Hz +/- 1 Hz
	Operational Modes		Strap selectable: Master or Slave
	Maximum Number per system	IMACS 600	1
		IMACS 800	1 Master, 3 slaves (DC operation)
		IMACS 900	2 slaves (AC operation)
			1 Master, 1 slave
	Redundancy		There is no provision for Master Ringer redundancy, however
			the slave units provide fail-over protection
March 2001			Page 20