Zhone-technologies ZTI-PG Manual de usuario descargar pdf (Pagina 7)

A C C E S S F O R A C O N V E R G I N G W O R L D

The EFM standard supports on-the-ﬂy adaptation of bond groups, allowing the bonding of pairs with unequal

rates, as well as hitless adds or drops of individual pairs from the group. This resiliency translates into higher value

for EFM services in mission-critical business or public-sector applications where high link reliability and stability is

of utmost importance.

The performance of the EFM standard represents a nearly 10x improvement over legacy T1/E1-based services.

Rates for links without repeaters stay very robust over the typical “in town” distances required to serve SMOs. The

addition of repeaters can carry multi-megabit speeds over copper at the greater distances required for cell site

backhaul.

ame

agments

From Dist’

n x SHDSL

PHY

Ethernet

MAC

How EFM Works

EFM Aggregation

Platform

Ethernet

Access

Device

n x T

wisted

air Copper

Loops

Ethernet F

eassembled F

ame

Theoretical Best-Case EFM Rate vs. Reach

(Zero-Noise Environment)

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

16,000

0 1 2 3 4 5 mi.

T1 reference

Up to 4 repeaters can be

used, on 6 kft. spacing

1 2 3 4 5 6 7 8 km

t Ra

TC-PAM-128 Modulation

...-64

...-16

…-32

...-8

TC-PAM-4

0.4mm / 26AWG Loop Length

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

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Zhone-technologies ZTI-PG Manual de usuario Pagina 7

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