HT-IP

Fibre-Optic Hotline Telephone System

Name: SMART HT-IP Fibre-Optic Hotline Telephone System
Brand: SMART
SKU: ht-ip

Point-to-point ring-down hotline over single-mode fibre between two sites

Single-mode fibre10 km1310/1550 nm

Datasheet · PDF 72 KB

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Category: Hotline Systems
Environment: Indoor
Interface: Fibre

Ideal for

Control room to remote site hotlines
Long-distance plant links
Sites up to 10 km apart on fibre

What it does

For hotlines that run too far for copper. Two desktop phones each connect on one pair to a SMART IP controller, and the controllers link over single-mode optical fibre. Lift either handset and the far end rings until answered; replace both handsets and the line resets.

01
Automatic ring-down: lift to ring the far end
02
Full-duplex conversation
03
Controllers linked by single-mode fibre, up to 10 km
04
Phones on non-critical telephone cable to each controller
05
Resets automatically when both handsets are replaced

Specifications

Electrical · 3

Ring voltage	70 Vrms at 20 Hz
FXS output impedance	600 Ω
Power supply	230 V AC

Acoustic · 3

Audio bandwidth	300 Hz to 3.4 kHz
Input range	1.5 to -40 dBm (2/4-wire 600 Ω)
SNR	32 to 36 dB

Environmental · 1

Humidity	95% non-condensing

Connectivity · 6

Optical transmitter	LED/ELED
Optical receiver	PIN diode
Wavelength	Tx/Rx 1310/1550 nm or 1550/1310 nm
Fibre type	Single mode 8.3/125, 8.7/125, 9/125 or 10/125 µm
Distance	Up to 10 km
Phone connector	RJ11 female

Compare with similar models

Differences first: interface, power, protection and output, then installation. Full specifications are in each model's table.

Comparison of HT-IP with similar models. Rows that differ come first; “Not specified” means the datasheet does not list it.
Specification	HT-IP Fibre-Optic Hotline Telephone System	HT-I Hotline System with Normal Phones	HT-A Hotline PA Telephone System
Interfacediffers	Fibre	Stand-alone	Stand-alone
Power supplydiffers	230 V AC	220 V AC (controller)	220 / 110 V AC (controller and each hotline PA telephone)
Cablediffers	Not specified	Single pair wire	Single pair (2-core telephone cable) to controller; long loop up to 1 km of 2-core 0.5 sq mm
Battery backupdiffers	Not specified	Built-in, continuous online UPS	Online built-in
Phonesdiffers	Not specified	Up to 4 normal desktop phones	Two desktop hotline PA telephones
Environment	Indoor	Indoor	Indoor

Part of a system

Hotline network

Direct lines with no dialling, from control rooms to the posts that need an answer now. Three SMART hotlines cover one pair of copper, PA paging on pick-up, and single-mode fibre between sites.

How the system works