Lucent Technologies 8.2 User Manual

Issue 1

April 2000

Features and technical reference 

1321

DS1 Trunk Service 

Channel Associated Signaling (CAS) is similar to common-channel signaling and 
is used only when the Bit Rate is 2.048 Mbps (the trunk is used with an E1 
interface). Signaling is carried on the 16th channel.

Common-channel signaling and channel associated signaling provide a maximum 
transmission rate of 64 Kbps for bearer channels.

Robbed-bit signaling is a per-channel signaling technique for transmitting 
signaling bits on each channel in a DS1 facility. The least-significant bit in every 
6th transmitted information frame is removed and replaced by a signaling bit. This 
technique is also called in-band signaling. The maximum transmission rate for 
each bearer channel with robbed-bit signaling is 56 Kbps.

ISDN-PRI signaling is carried on the 24th channel for a 1.544 Mbps connection 
and on the 16th channel for a 2.048 Mbps connection.

The table below shows DEFINITY ECS public network access connections for 
ISDN-PRI Layer 3.

1 - a

United States, 
Canada

AT&T TR 41449/ 41459 (tested with AT&T 
network, Canadian network, and MCI 
network)

Service

1 - b

United States 

Bellcore TR 1268;
NIUF.302; ANSI T1.607

Restart

1 - c

United States

NORTEL DMS-250 BCS36/IEC01

Service

2a

Australia

AUSTEL TS014.1;
Telecom Australia TPH 1856 National ISDN 
protocol

Restart

2b

Australia

ETSI ISDN protocol

Restart

3

Japan

NTT INS-NET

Restart

4

Italy

ETS 300 102

Restart

5

Netherlands

ETS 300 102

Restart

6

Singapore

ETS 300 102

Restart

7

Mexico

ETS 300 102

Restart