XRT73R12_07 Datasheet, PDF (42/89 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

XRT73R12
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.0.2
TABLE 10: JITTER AMPLITUDE VERSUS MODULATION FREQUENCY (JITTER TOLERANCE)
BIT RATE
(KB/S)
STANDARD
INPUT JITTER AMPLITUDE (UI _P-P)
A1
A2
A3
F1(HZ)
MODULATION FREQUENCY
F2(HZ) F3(KHZ) F4(KHZ)
F5(KHZ)
34368 ITU-T G.823 1.5
0.15
-
100
1000
10
800
-
44736
GR-499
5
0.1
-
10
2.3k
60
300
-
CORE Cat I
44736
GR-499
10
0.3
-
10
669
22.3
300
-
CORE Cat II
51840
GR-253
15
1.5
0.15
10
30
300
2
20
CORE Cat II
5.2 JITTER TRANSFER
Jitter Transfer function is defined as the ratio of jitter on the output relative to the jitter applied on the input
versus frequency. There are two distinct characteristics in jitter transfer, jitter gain (jitter peaking) defined as
the highest ratio above 0dB and jitter transfer bandwidth. The overall jitter transfer bandwidth is controlled by a
low bandwidth loop, typically using a voltage-controlled crystal oscillator (VCXO).
The jitter transfer function is a ratio between the jitter output and jitter input for a component, or system often
expressed in dB. A negative dB jitter transfer indicates the element removed jitter. A positive dB jitter transfer
indicates the element added jitter. A zero dB jitter transfer indicates the element had no effect on jitter.
Table 11 shows the jitter transfer characteristics and/or jitter attenuation specifications for various data rates:
TABLE 11: JITTER TRANSFER SPECIFICATION/REFERENCES
E3
DS3
STS-1
ETSI TBR-24
GR-499 CORE section 7.3.2
Category I and Category II
GR-253 CORE section 5.6.2.1
NOTE: The above specifications can be met only with a jitter attenuator that supports E3/DS3/STS-1 rates.
RATE
(KBITS)
34368
44736
51840
MASK
G.823
ETSI-TBR-24
GR-499, Cat I
GR-499, Cat II
GR-253 CORE
GR-253 CORE
TABLE 12: JITTER TRANSFER PASS MASKS
F1
F2
F3
F4
(HZ)
(HZ)
(HZ)
(KHZ)
100
300
3K
800K
10
10k
-
15k
10
56.6k
-
300k
10
40
-
15k
10
40k
-
400k
A1(dB)
0.5
0.1
0.1
0.1
0.1
A2(dB)
-19.5
-
-
-
-
39