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RS8953BEPF

HDSL Channel Unit

Conexant Systems 

1.0 HDSL Systems

1.1 HTU Applications

1.1.5 Point-to-Multipoint

RS8953B/RS8953SPB

HDSL Channel Unit

Figure 1-6 shows fractional T1/E1 services delivered from the CO to multiple

remote sites in a Point-to-Multipoint (P2MP) application. The number of HDSL

wire pairs and PCM channel rates at each site is variable. The RS8953B provides

the ability to measure and compensate for misalignment between separate PCM

frame syncs coming from each remote site. By programming transmit delays from

PCM to HDSL frame syncs, each remote site can send its HDSL frames back to

the central office. The HDSL frames are then sufficiently aligned with the others

to be reconstructed into a single PCM frame at the central site. The RS8953B

accommodates large differential delays associated with the P2MP application. It

receives HDSL frame offsets to groom Channel Associated Signaling (CAS)

from different sites.

P2MP applications of primary rate ISDN transport are also supported, where

different LAPD channels are received from each remote site. The RS8953B

provides auxiliary HDSL channel inputs and outputs for the system to externally

insert and monitor transmitted or received HDSL payload bytes. Auxiliary HDSL

channels may alternately be configured to terminate the last 40 Z-bits through an

external data link controller.

Figure 1-6. Point-to-Multipoint (Fractional) System Block Diagram

LAPD Signaling or

Management Protocol

SCC SCC SCC

Optional

Full

T1/E1

RS8953B

CH1

CH2

CH3

CH1

CH1

CH1

Site A

RS8953B

Partial

T1/E1

Site B

RS8953B

Partial

T1/E1

Site C

RS8953B

Partial

T1/E1

NOTE(S):

1. SCC = Serial Communications Controller

2. LAPD = Link Access Procedure D-Channel

3. AUX = Auxiliary HDSL channel attaches to payload or Z-bits

1-6

Conexant

N8953BDSB

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