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Overview
Application Note 1218
ADC HDSL Compatibility
and CSU Power Options
ADC offers a wide variety of HDSL modules to fit numerous shelf types such as industry
standard 220 style repeater, 3192 style repeater and also ADC’s unique Soneplex system
chassis. All chassis styles provide the mechanical interface for conversion from standard
DS1 signals to HDSL encoded signals. This HDSL encoded signal is called 2B1Q and
provides the capability to transmit DS1 signal information over longer distances without
the need for traditional repeaters.
This application note serves a dual purpose. First, it addresses the compatibility between
current and past versions of ADC’s HDSL product for all three chassis types. Second, the
CSU powering options are defined for ADC’s HDSL remote end products.
®
2
HDSL Compatibility and CSU Power Options Application Note 1218
Figure 2
Modules compatible with the HDSL repeater
ADC continuously strives to enhance its products by improving features. The HDSL
product line is no exception. The many advances made since the product’s inception have
led to multiple options for deployment. Figure 1 details all released HDSL module
versions and their compatibility to other modules. Figure 2 indicates which modules are
compatible with the HDSL repeater.
As shown in Figure 1, many remote modules are compatible with central office modules.
Note that when an older version module communicates with a newer version, some
capabilities may be limited. These limitations include:
• HLXC C1 to HLXR D(X) – Monitor only at HLXR craft port; no HDSL repeater support
• HLXC D1 to HLXR B1– No HDSL repeater support
• HLXC B1 220/3192 to HLXR B1– No HDSL repeater support
HDSL
Compatibility
Figure 1
Released HDSL module versions and their compatibility to other modules
SONEPLEX
CHASSIS
220
CHASSIS
3192
CHASSIS
CENTRAL OFFICE REMOTE SITE
SPAN POWERED ONLY
60 mA SIMPLEX
(NO DS1 IDLE SIGNAL)
SPAN POWERED ONLY
NO 60 mA SIMPLEX
(NO DS1 IDLE SIGNAL)
SPAN POWERED ONLY
60 mA SIMPLEX
DS1 IDLE SIGNAL
LOCAL OR SPAN POWERED
60 mA SIMPLEX
(NO DS1 IDLE SIGNAL)
HLXC
220 B1
HLXC
D1
HLXC
319 B1
HRX
COMPATIBLECOMPATIBLE
HLXR
D1
HLXR
D2
HLXR
D3
HLXR
D4
SONEPLEX
CHASSIS
SONEPLEX
CHASSIS
SONEPLEX
CHASSIS
220
CHASSIS
220
CHASSIS
3192
CHASSIS
3192
CHASSIS
CENTRAL OFFICE
COMPATIBLE
COMPATIBLE
HLXC
B1 OR C1
HLXC
A1
HLXC
220 A1
HLXC
319 A1
HLXC
D1
HLXC
220 B1
HLXC
319 B1
REMOTE SITE
HLXR
B1
HLXR
A1
HLXR
D1
HLXR
D2
HLXR
D3
HLXR
D4
SPAN POWERED ONLY
60 mA SIMPLEX
(NO DS1 IDLE SIGNAL)
SPAN POWERED ONLY
60 mA SIMPLEX
(NO DS1 IDLE SIGNAL)
SPAN POWERED ONLY
NO 60 mA SIMPLEX
(NO DS1 IDLE SIGNAL)
SPAN POWERED ONLY
60 mA SIMPLEX
DS1 IDLE SIGNAL
LOCAL OR SPAN POWERED
60 mA SIMPLEX
(NO DS1 IDLE SIGNAL)
LOCAL OR SPAN POWERED
60 mA SIMPLEX
(NO DS1 IDLE SIGNAL)
3
HDSL Compatibility and CSU Power Options Application Note 1218
CSU Power
Options
Powering a customer premises device such as a channel
serving unit (CSU) or network interface device (NID)
using a local power supply may not be practical or
possible in some circumstances. ADC’s HDSL modules
offer an alternative powering mechanism called simplex
power which provides power to the NID/CSU device from
the remote HDSL module. Simplex power is provided on
the DS1 transmit and receive pairs and consists of a
constant 60 mA current source. It is important to note
that simplex power does not modify the transmission data
in any way.
Table 1 indicates which HDSL remote modules have the
ability to provide simplex power and the associated
specifications.
MODULE
1.4 Watts
(Max 24V)
60 mA Simplex
4 Watts
(Max 67V)
HLXR A1
HLXR B1
HLXR D1
HLXR D2
HLXR D3
HLXR D4
NO NO
Table 1
Feature
Considerations
Previous versions of the remote HDSL (HLXR) modules varied slightly in the way
simplex power was provisioned. The differences are as follows:
A1 version HLXR (SPX-HLXRA1) required the placement of a wire strap across two pins
on the chassis in order to provide 60 mA simplex power. Simplex is always enabled while
the strap is in place.
B1 version HLXR (SPX-HLXRB1) required the placement of a wire strap across two pins
on the chassis in order to provide 60 mA simplex power. Simplex is always enabled while
the strap is in place.
D1, D2, D3* version HLXR (SPX-HLXRD[X]) modules provide simplex power on initial
power up if wire strap is present on chassis. The wire strap can be ignored if software
provisioning is preferred. Simplex power can be enabled or disabled through software.
This feature allows easy migration to D(X) modules in existing chassis configurations.
Wire strap is not required when D version modules are present at both locations.
It is important to note that the D1 HDSL central office module (HLXC) supports the use
of an optional HDSL repeater shown in Figure 2. This optional HDSL repeater is used to
effectively double the distance between the central office module and the remote
module.
Soneplex HDSL applications with D version modules at both ends must have a version 5
MPU present in the central office chassis in order to utilize the full feature capability
(HDSL repeater and full remote craft functionality).
If an MPU is desired with Soneplex B1/C1 HDSL module applications, a 3.1 or higher
version MPU is required.
*As previously indicated in Table 1, D4 version HLXR modules do not provide simplex power.
Application Note 1218 9/95 Original © 1994 ADC Telecommunications, Inc. All Rights Reserved An Equal Opportunity Employer
Specifications published here are current as of the date of publication of this document. Because we are continuously improving our products,
ADC reserves the right to change specifications without prior notice. At any time, you may verify product specifications by contacting our
headquarters office in Minneapolis.
ADC Telecommunications, Inc.
4900 West 78th Street
Minneapolis, Minnesota 55435
FAX: (612) 946-3292
For U.S. Sales, Call Toll Free: 1-800-366-3891
International Sales Offices: Belgium 32-2-721-5282 • United Kingdom
44-734-441955 • Montreal, Quebec (514) 677-9166 • Vancouver, BC
(604) 270-1675 • Toronto, Ont. (905) 629-3104 • Ottawa, Ont. (613)
723-2171 • Singapore 65-225-8228 • Venezuela 58-2-953-1684 •
Mexico City, Mexico 525-658-4519 • Sydney, Australia 61-2-975-1499
. SIGNAL)
3
HDSL Compatibility and CSU Power Options Application Note 1218
CSU Power
Options
Powering a customer premises device such as a channel
serving unit (CSU) . Note 1218
ADC HDSL Compatibility
and CSU Power Options
ADC offers a wide variety of HDSL modules to fit numerous shelf types such as industry
standard 220
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