Cisco ONS 15454 SDH Spezifikationen PDF herunterladen (Seite 13)

Cisco ONS 15454 SDH Product Overview, R3.4

September 2002

Cisco ONS 15454 SDH Product Overview

Card Slots and Types

E1-N-14 Card

The E1-N-14 card provides fourteen ITU-compliant, G.703 E-1 ports. Each port

operates at 2.048 MBits/s (Mbps) over a 120-ohm twisted-pair copper cable with

the DS1/E1 FMEC, or over a 75-ohm unbalanced coaxial cable with the E1

FMEC.

The E1-N-14 card can be used as a working or protect card in 1:1 or 1:N

protection schemes. If you use the E1-N-14 as a standard E-1 card in a 1:1

protection group, you can install the E1-N-14 card in any multispeed or

high-speed card slot on the ONS 15454 SDH. To use the 1:N functionality of the

card, you must install an E1-N-14 card in Slot 3 or Slot 15.

E3-12 Card

The E3-12 card provides twelve ITU-compliant, G.703 E-3 ports per card. Each

port operates at 34.368 MBits/s (Mbps) over a 75-ohm coaxial cable with the

E3/DS3 FMEC. The E3-12 card can be used as a working or protect card in 1:1

protection schemes. When creating circuits, the E3 card must use port grouping

with VC low-order path tunnels. Three ports form one port group. For example,

in 1 E3 card, there are 4 port groups: Ports 1 to 3 = PG1, Ports 4 to 6 = PG2, Ports

7 to 9 = PG3, and Ports 10 to 12 = PG4.

DS-3i Card

The DS3i-N-12 card provides twelve DS-3 ports per card, compliant with ITU-T

G.703, Telcordia GR-499, and ITU-T G.704. Each port operates at 44.736

MBits/s (Mbps) over a 75-ohm coaxial cable with the E3/DS3 FMEC. The

twelve-port DS3i-N-12 card provides enhanced performance monitoring functions.

By monitoring additional overhead in the DS-3 frame, subtle network degradations

are detected. The DS3i-N-12 can operate as the protect card in a 1:N (N < 4) DS-3

protection group. It can protect up to four working DS3i-N-12 cards. When

creating circuits, the DS3i-N-12 card must use port grouping with VC low-order

path tunnels.

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