DMM
‐
4880 & DMX
‐
4880 Instruction Book
Revision 0
www.irtelectronics.com
Page 6 of 16
4880
‐
DMM_4880
‐
DMX_ib_Rev0.doc
Technical Specifications
DMM
‐
4880:
Inputs:
Type 1
4 x STM
‐
1 (OC
‐
3), 75
Ω
, 1Vp
‐
p, BNC connector.
Electrical Characteristics
CMI encoded.
Data Rate
155.52 Mb/s.
Equalisation
Automatic, > 200m at 155Mb/s for Belden 8281 or equivalent cable.
Type 2 (Optional)
1 x optical STM
‐
4 (OC
‐
12), LC/PC (standard) optical connector.
Optical Characteristics
NRZ encoded.
Data Rate
622.08 Mb/s.
Output:
Type
1 x optical STM
‐
4 (OC
‐
12), SC/PC (standard) optical connector
1
.
Optical Characteristics
NRZ encoded.
Data Rate
622.08 Mb/s.
Alarm Output:
MAJOR
Not used. Open circuit on loss of power.
MINOR
Open circuit on no valid input STM
‐
1 streams present, or loss of power.
DMX
‐
4880:
Input:
Type
1 x STM
‐
4 (OC
‐
12), optical, SC/PC optical connector (standard).
Optical Characteristics
NRZ encoded.
Data Rate
622.08 Mb/s.
Outputs:
Type
4 x STM
‐
1 (OC
‐
3) 75
Ω
, 1Vp
‐
p, BNC connector.
Data Rate
155.52 Mb/s.
Alarm Output:
MAJOR
Open circuit on no valid STM
‐
4 input present, or loss of power.
MINOR
Open circuit on no valid output STM
‐
1 streams present, or loss of power.
Optical
Optical path loss
2
3 to 18 dB with PIN detector (typically 20dB),
Optical fibre
Designed for use with 9/125
μ
m single mode fibre.
Optical wavelength
1310nm (DFB laser
‐
standard).
Optical connectors
SC/PC (standard).
DMM
‐
4880 optical output
0 dBm +3/
‐
0 dB standard DFB laser,
DMX
‐
4880
optical input
PIN detector,
‐
3 to
‐
18 dBm input level
Power Requirements
28 Vac CT (14
‐
0
‐
14) or
±
16 Vdc.
Power consumption
7 VA.
Other
Temperature range
0
‐
50° C ambient.
Mechanical
Suitable for mounting in IRT 19" rack chassis with input, output and power
connections on the rear panel.
Finish
Front panel
Grey background, black lettering & red IRT logo.
Rear
assembly
Detachable
silk
‐
screened PCB with direct mount connectors to Eurocard and
external signals.
Dimensions
6 HP x 3 U x 220 mm IRT Eurocard.
NOTE:
1
If optional STM
‐
4 reference fitted, standard output optical connector is an
LC/PC type.
2
Optical attenuator required for optical paths <3dB optical loss.
Due to our policy of continuing development, these specifications are subject to change without notice.
IRT
Communications
www.irtcommunications.com
