FOM-E1/T1 Installation and Operation Manual Chapter 1 Introduction
Technical Specifications 1-5
1.4 Technical Specifications E1/T1
Interface
Transmission Rates E1: 2.048 Mbps
T1: 1.544 Mbps
Interface User-selectable:
• E1: 120Ω balanced or 75Ω unbalanced
• T1: 100Ω balanced
Zero Suppression E1: HDB3
T1: B8ZS
Connectors Balanced: 15-pin D-type, female
Unbalanced: two BNC
Optical
Interface
Operating
Wavelength
See Table 1-1
Receiver Sensitivity For BER 10-9:
• -38 dBm at 850 nm
• -40 dBm at 1310 nm or 1550 nm
Connectors ST, SC or FC
Dynamic Range 28 dB for all types of optical interfaces
Budget (Max) 20 dB for 850 nm over 62.5/125
22 dB for 1310 nm over 9/125
28 dB for 1310 nm or 1550 nm laser over 9/125
Alarm Operation Normally Open and Normally Closed, using different pins
Connector 15-pin, D-type, female
Indicators POWER ON – The unit is powered
TEST LOC ON – The unit is in local loopback mode
TEST REM ON – The unit is in remote loopback mode
ELECTRICAL LOW ON – The electrical interface input is below G.703
electrical levels
ELECTRICAL AIS ON – An “All 1s” string is received at the electrical
interface
OPTICAL ERR ON – Bit error rate of the received signal from the optical
interface is 10-6 or worse
OPTICAL AIS ON – An “All 1s” string is received at the optical interface