78P2241
E3/DS3/STS-1
Transceiver
8
DS3/STS-1 RECEIVER (RFO = 5.23k
W
for DS3 and 4.53k
W
for STS-1,
pin is set high or allowed to float),
Input is transformer coupled
PARAMETER
Peak Differential Input
Amplitude, LIN+ and LIN-
(see Note 5)
Peak Differential Input
Amplitude, LIN+ and LIN-
Peak Differential Input
Amplitude, LIN+ and LIN-
CONDITION
MON=0. Signal at DSX is 360-850mVP
(see Note 6)
MIN
90
TYP
MAX
850
UNIT
mVP
Mon=1
25
80
mVP
Mon=0. DS3 HIGH (see Note 7)
90
1200
mVP
Bit Error Ratio in the presence of
an Interfering Signal (IS) at
LIN+,LIN-
IS is a sinusoidal tone, 22.368 MHz
for DS3 or 25.92MHz for STS-1. Data
is a PRBS15 (2
-1) pattern. IS power
is 10dB below data signal power.
Cl=25pf
DS3
STS-1
DS3
STS-1
CL=15 pF
10
-9
RCLK rise/fall time
TRCT
RCLK period
TRCF
RCLK pulse width
TRC
RPOS/RNEG data setup time
TRDPS
RPOS/RNEG data hold time
TRPDH
5
ns
ns
22.35
19.29
12.24
9.65
ns
7
ns
CL=15 pF
7
ns
Note 5:
Signal source should meet DS3 template of ANSI-T102.1993 Figure 4 and STS-1 template of ANSI-
T102.1993 Figure 5, Loss characteristics of the WE728A or RG 59B cable should be better than Figure
C2 of ANSI-T102.1993.
Note 6:
Receiver can handle up to 450 feet of cable loss (5.5dB) from the DSX cross-connect.
Note 7:
Case where test signal is fed directly into receiver with fast rise times violates DS3 template and normal
maximum. In this mode no noise, jitter, or interfering tone impairments will be added.
Note 8:
This is performed in digital loop-back mode. Jitter is supplied by a Bit Error Rate Tester and bit errors
are measured. Jitter is specified in terms of UI (Unit Interval) and frequency, is summed with DS3
PRBS15 data through 450 feet of cable.
E#