Chapter 12. G.703; Table 12-1. G.703 Specifications - Comtech EF Data SDM-300L3 Installation And Operation Manual

12.1 G.703
G.703 data is either in AMI, B8ZS (8 zero) suppression, or HDB3 (3 zero) suppression
formats. There is not a coexisting clock that is on a separate line for G.703 data. The
clock is derived from the data stream within the modem and in the user equipment. Loop
timing, if desired, must occur in the customer equipment for the link to operate in
Master/Slave. The modem cannot do loop timing in G.703 operation because the modem
does not emit an ST signal for the Transmit Clock Source.
12.1.1 G.703 Specifications
Parameter
Primary Data Circuits Supported
Interface Type
Data Rates
Pulse Width
SD Amplitude
RD Amplitude
Pulse Mask
Jitter Attenuation
Line Code

Chapter 12. G.703

Table 12-1. G.703 Specifications

Specification
T1 SD, RD
E1 SD, RD
Transformer coupled symmetrical pair
T1 1544 kbps ± 100 bps
E1 2048 kbps ± 130 bps
T1 324 ± 50 Ns
E1 244 ± 25 Ns
T1 3V +0.3/-1.5V-pk into 100Ω
E1 3V +0.3/-1.5V-pk into 120Ω
T1 3V +0.3/-1.5V-pk into 100Ω
E1 3V +0.3/-1.5V-pk into 120Ω
T1 G.703.2
E1 G.703. 6
T1 G.824
E1 G.823
AMI, B8ZS, B6ZS, HDB3
12–1