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Quad Gigabit Ethernet Fiber Transceiver

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The 7708GT-4 is a VistaLINK®-capable Quad Gigabit Ethernet Fiber Transceiver for up to four independent 10/100/1000BaseT Ethernet channels over optical fiber. Monitoring of card status and parameters are provided locally at the card edge and remotely via VistaLINK®. A pair of 7708GT-4 transceivers permit full duplex communication of all four channels up to 1GB/s each over a pair of optical fibers.

The 7708GT-4 occupies one card slot and can be housed in the 1RU 7801FR frame which holds up to four single or two dual slot modules, the 3RU 7800FR frame which has a 15 slot capacity, the portable 3RU 350FR frame which has a 7 slot capacity, or a standalone enclosure which holds a single module.


  • Four completely independent and isolated Ethernet streams
  • Low latency
  • Auto negotiation for 10/100/1000 speeds on all ports
  • Comprehensive signal and card status monitoring via four digit card edge display or remotely through SNMP and VistaLINK®
  • VistaLINK® capable for remote monitoring via SNMP (using VistaLINK® PRO) when installed in 7800FR frame with a 7800FC VistaLINK® Frame Controller
  • Optical output wavelengths at 1310nm, 1550nm and up to sixteen CWDM wavelengths (ITU-T G.694.2 compliant)
  • DWDM wavelengths (ITU-T G.694.1 compliant) also available
  • Fully hot-swappable from front of frame
  • Optical SFP supportable from the rear
  • Status Indication

  • Frame status
  • 10/100/1000 Speed indication on copper ports
  • Full Duplex/Collision indication on copper ports
  • Link activity on copper ports
  • Received optical power level

7708GT-4 Application Configurations

ModelWavelengthOptical Output PowerReceiver SensitivityReceiver Max InputNominal Received WavelengthMax DistanceFiber Type & Connector

**70km on 1590nm and 1610nm

1310nm+0.5dBm-8.5dBm-14dBm+1dBm1310nm10kmSMF, duplex LC/PC
1550nm+4dBm-5dBm-15dBm+1dBm1550nm40kmSMF, duplex LC/PC
1550nm+3dBm0dBm-24dBm-7dBm1550nm80kmSMF, duplex LC/PC
+2dBm-1dBm-14dBm-1dBm1270nm-1610nm40kmSMF, duplex LC/PC
+3dBm0dBm-24dBm-7dBm1270nm-1610nm70/80km**SMF, duplex LC/PC
+3dBm-1dBm-24dBm-7dBm1270nm-1610nm80kmSMF, duplex LC/PC


Ethernet Input/Output

Standard IEEE 802.3 10base-T
802.3u 100base-TX
802.3ab 1000base TX
Connectors 4 RJ45 ports
Cable Requirements
10Base-T UTP category 3, 4, or 5 cable up to 328ft/100m
100Base-T UTP category 5 cable up to 328ft/100m
1000Base-T UTP category 5 cable up to 164/50m
Latency 2ns @ 1GB/s (per link with 1m patch cable)

Ethernet Input/Output

Connector Optical SFP Cage, LC-UPC connectors
Optical SFP 1000 Base X
RJ45 SFP 1000 Base TX


Voltage +12V DC
Power 12 watts


Number of Slots 1


Laser Safety Class 1 laser product
Complies with 24 CFR 1040.10 and 1040.11
IEC 60825-1
EMI/RFI Complies with FCC Part 15, Class A
EU EMC Directive

Ordering Information

Notes Select from optical and SFP options below
7708GT‑4 Quad Gigabit Ethernet fiber transceiver, RJ45 ports for Ethernet connection
7708GT‑4‑F Quad Gigabit Ethernet fiber transceiver, SFP interface for Ethernet connection (SFP's not included)

Ordering Options

Notes Rear plate must be specified at time of order - eg: [model]+3RU
Rear Plate Suffix
+1RU 1RU rear plate for use with 7701FR Multiframe
+SA Standalone Enclosure Rear Plate
+3RU 3RU rear plate for use with 350FR, 7700FR-C, 7800FR or 7801FR Multiframes


350FR Portable Multiframe which holds 7 single slot modules
7700FR-C 3RU Multiframe which holds 15 single slot modules
7800FR 3RU Multiframe which holds 15 single slot modules
7801FR 1RU Multiframe which holds up to 4 single slot or 2 dual slot modules
7701FR 1RU Multiframe which holds 3 single slot modules
S7701FR 7700 Series Standalone Enclosure

Trunk Optical options

SFP10G-TR13-J 1310nm laser, 10km max, SMF
SFP10G-TR15S 1550nm laser, 40km max, SMF
SFP10G-TR15H 1550nm laser, 80km max, SMF
CWDM & DWDM (Ordering Information)
SFP10G-TRCxx CWDM laser (1470-1610nm), 40km max, SMF
SFP10G-TRCxxH CWDM laser (1470-1610nm), 70km/80km max, SMF
SFP10G-TRDxxxH DWDM laser (ch.20-ch.59), 80km max, SMF

7708GT-4-F Ethernet SFP Options

SFPTR-13 SFP GigE optical tranceiver, 1310nm, SMF, standard sensitivity
SFPTR-Cxx SFP GigE optical transceiver, CWDM (1270-1610nm), SMF, standard sensitivity