RAD Data comm Modular Access Device with Integrated Router IO Data Channel Interfaces, AWG line

FCD-IPMInstallation and Operation Manual Chapter 1 Introduction

The main and sublinks have two line interfaces:

•120Ω balanced line interface, terminated in an RJ-48C eight-pin (ISO 10173) connector

•75Ω unbalanced interface, terminated in two BNC coaxial connectors

•T1 versions have a 100Ω balanced interface.

You can select the E1 interface to activate the LTU option. With the T1 version, you can choose to activate CSU or DSU.

When a power failure occurs, the failsafe bypass of the sub E1/T1 link ensures the continuity of voice services between the main and the fix sublink.

Note The fail-safe bypass of the E1/T1 sub-link is not available for the FCD-IPM units equipped with SHDSL interface.

E1 over SHDSL

E1 traffic can also be transmitted using 2-wire SHDSL physical interface. The SHDSL link uses TC-PAM technology and complies with the requirements of the ITU-T G.991.2 standard. Table 1-1lists typical FCD-IPM ranges over 2-wire

24 AWG line.

Table 1-1. Typical FCD-IPM Ranges over SHDSL Link

Data Rate	2-wire, 24 AWG (0.5 mm)
kbps	km	miles
192	6.5	4.0
384	5.8	3.6
512	5.1	3.1
768	4.8	2.9
1024	4.1	2.5
1152	3.5	2.1
2048	3.2	1.9

IO Data Channel Interfaces

Each of the two IO data channels can be operated as n x 64k or n x 56k data port (DCE only).

System Timing Considerations

Internally, FCD-IPM uses one system timing source (clock). This system clock determines the transit timing of all the E1 links and data ports. The clock source options are as follows:

•Main link 1

•Sublink (each of them)

•Internal.

Functional Description 1-7