Spectracom SecureSync 1200 User Reference Manual page 406

APPENDIX
Model 1204-0A E1/T1 (100/120 Ω): Specifications
Outputs :
T1 mode :
E1 mode :
Connector and Signal Type : Terminal block
Maximum Number of Cards : 6
Ordering Information : 1204-0A: T1/E1 (100/120 Ω) module
Figure 5-36:
390
(1) 1.544/2.048 MHz RS-485 Outputs
(2) Balanced E1/T1Outputs
1.544 MHz (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
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
1.544/2.048 MHz RS-485
T1 according to GR-499-CORE (100 Ω)
E1 according to ITU-T G703 (120 Ω)
Model 1204-0A option card rear plate
SecureSync User Reference Guide