IRT Communications DMM-4880, Instruction Manual

Page: 6 / 16

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