Cisco PXM Version 1.1 Manual de usuario descargar pdf (Pagina 3)

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PHYSICAL LAYER T1/E1 INTERFACE

Table 1 describes the physical characteristics of the Cisco MGX PXM-1E T1/E1 interface.

Table 1. Physical Layer T1/E1 Interface Type of Back Card

T1 E1

Port Speed

1.544 Mbps 2.048 Mbps

Cell Transfer Rate

3622 cells/sec 4528 cells/sec (G.704)

Number of Ports

16 16

Line Coding

B8ZS HDB3

Line Framing

ANSI T1.408 extended Super Frame format line framing ITU-T G.704 16 frame multiframe line framing

Port Media

100 ohm twisted pair 120 ohm twisted pair for RBBN and 75 ohm coaxial

for MCC

Port Connector

RBBN RBBN and MCC

Cell Mapping

Direct Direct

Redundancy

1:1, Y-cable 1:1, Y-cable

PHYSICAL LAYER T3/E3 INTERFACE

Table 2 describes the physical characteristics of the Cisco MGX PXM-1E T3/E3 interface (8 T3/E3 port or 8 T3/E3 ports plus 4 port OC-3c/STM1

Combo modules).

Table 2. T3/E3 Interface Physical Characteristics

Characteristic T3 (DS3)*** E3***

Line Rate

44.736 Mbps ±20 ppm 34.368 Mbps ±20 ppm

Line Code

B3ZS HDB3

Cell Transfer Rate

96,000 cells per second in PLCP mode

104,268 cells per second in ADM mode

80,000 cells per second

Framing

C-bit Parity ITU** T G.832

Signal Level

ANSI T1.102, Telecordia GR-499 Core ITU-T G.703

Connector

Male SMB* and MCC** Male SMB* and MCC**

Cell Mapping

Physical Layer Convergence Protocol (PLCP) and Direct Direct***

* Male SMB for 8 port T3/E3 modules

** MCC is used in the 8 port T3/E3 ports on the MGX-T3E3-155 Combo Modules

***T3 or E3 is software configurable in the 8 port T3/E3 ports on the MGX-T3E3-155 Combo Modules

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