PairGain HiGain-ETSI RS UTU 712, Manual

Page: 10 / 80

Overview 700-712-100-01, Revision 01
2 May 10, 1999 UTU-712 and ETU-762 List 1
EMU F
IRMWARE
C
OMPATIBILITY
The EMU-830 Management Unit firmware must be Version 3.30 or later to support rate selectable HDSL units.
A
PPLICATION
I
NTERFACE
The application interface is a synchronous serial data port with two modes of operation, Manual and Nx64k Auto.
IIn the Nx64k Auto mode, the HDSL payload rate is determined by the frequency of the TT clock received at the
Nx64k data port of the LTU-configured unit. In the Manual mode, the HDSL payload rate is user selected from
the LTU console screen. The total available payload rate of 768 kbps can be user selected in increments of 64 kbps.
Each 64 kbps increment represents one time slot.
Time slots are mapped to the HDSL framer according to either the input clock frequency at the Nx64k data port
(Nx64k Auto mode) or the rate selection made from the LTU console screen (Manual mode). The time slot
configuration (HDSL rate) applied to the LTU determines the HDSL rate at the remote NTU.
The Nx64k serial data interface complies with the V.35, V.36, X.21, or RS-530 (RS-449) standard based on the
selection from the console screen menus.
Table 1 lists the characteristics of the rate selectable HDSL line and desktop units covered in this practice.
Figure 1 illustrates an application of a single-pair Nx64k interface where video service is transported from the
customer to an Nx64k serial network.
Figure 1. Transport of Customer Video Service to an Nx64k Serial Network
Table 1. Rate Selectable HDSL Unit Characteristics
Model Interface
Selectable HDSL
Rates (kbps)
LTU/NTU
Configurable
UTU-712 Nx64k 64 to 768 Yes
ETU-762 Nx64k 64 to 768 Yes
See “Functional Description” on page 11 for more information on the Nx64k interface.