Spectracom SecureSync User Reference Manual page 345

Figure 5-21:
5.3.1.2 Model 1204-0A E1/T1 (100/120 Ω): Specifications
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5 SecureSync User Reference Guide Rev. 18
T1 mode :
1.544MHz (square wave) frequency output
(2) 1.544 Mb/sec data rate outputs:
Outputs are DS1 framed all ones
Supports Super Frame (SF or D4) and Extended Super Frame (ESF)
SSM support
E1 mode :
2.048 MHz (square wave) frequency output
(2) 2.048 Mb/sec data rate outputs:
Outputs are E1 frame all ones
Supports CRC4 and CAS Multiframe
SSM support
Connector and Signal Type : BNC
1.544/2.048 MHz TTL into 50 Ω
T1 according to GR-499-CORE (75 Ω)
E1 according to ITU-T G703 (75 Ω)
Maximum Number of Cards : 6
Ordering Information : 1204-09: T1/E1 (75 Ω) module
Model 1204-09 option card rear plate
Outputs :
(1) 1.544/2.048 MHz RS-485 Outputs
(2) Balanced E1/T1Outputs
5.3 Telecom Option Cards
329