PM5366 datasheet(86/267 Pages) PMC

86 / 267 page

PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

9.7 T1/E1 Receive and Transmit Digital Jitter Attenuators

The TEMAP-84 contains two separate jitter attenuators, one between the receive

demultiplexed or demapped T1 or E1 link and the ingress interface and the other

between the egress interface and the transmit T1 or E1 link to be multiplexed

into DS3 or mapped into SONET/SDH. Each jitter attenuator receives jittered

data and stores the stream in a FIFO timed to the associated clock. The jitter

attenuated data emerges from the FIFO timed to the jitter attenuated clock. In

the receive jitter attenuator, the jitter attenuated clock is referenced to the

demultiplexed or demapped tributary receive clock. In the transmit jitter

attenuator, the jitter attenuated transmit tributary clock feeding the M13

multiplexer or SONET/SDH mapper may be referenced to either the data stream,

the CTCLK primary input, or the tributary receive clock.

Jitter Characteristics

The jitter attenuators provide excellent jitter tolerance and jitter attenuation while

generating minimal residual jitter. In T1 mode, each jitter attenuator can

accommodate up to 48 UIpp of input jitter at jitter frequencies above 4 Hz. For

jitter frequencies below 4 Hz, more correctly called wander, the tolerance

increases 20 dB per decade. In E1 mode each jitter attenuator can

accommodate up to 48 UIpp of input jitter at jitter frequencies above 5 Hz. For

jitter frequencies below 5 Hz, more correctly called wander, the tolerance

increases 20 dB per decade. In most applications, each jitter attenuator will limit

jitter tolerance at lower jitter frequencies only. The jitter attenuator meet the

stringent low frequency jitter tolerance requirements of AT&T TR 62411 and ITU-

T Recommendation G.823, and thus allow compliance with these standards and

the other less stringent jitter tolerance standards cited in the references.

The jitter attenuators exhibit negligible jitter gain for jitter frequencies below 3.4

Hz, and attenuates jitter at frequencies above 3.4 Hz by 20 dB per decade in T1

mode. It exhibits negligible jitter gain for jitter frequencies below 5 Hz, and

attenuates jitter at frequencies above 5 Hz by 20 dB per decade in E1 mode. In

most applications the jitter attenuators will determine jitter attenuation for higher

jitter frequencies only. Wander, below 10 Hz for example, will essentially be

passed unattenuated through the jitter attenuators. Jitter, above 10 Hz for

example, will be attenuated as specified, however, outgoing jitter may be

dominated by the waiting time jitter introduced by the multiplexing into DS3 or

mapping into SBI or SONET/SDH. The jitter attenuator allows the implied T1

jitter attenuation requirements for a TE or NT1 given in ANSI Standard T1.408,

and the implied jitter attenuation requirements for a type II customer interface

given in ANSI T1.403 to be met. The jitter attenuator meets the E1 jitter

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