Lucent Technologies 8.2

DEFINITY ECS Release 8.2

Administrator’s Guide

555-233-506 Issue 1

April 2000

Features and technical reference

1320DS1 Trunk Service

Signaling modes

Common-channel signaling (CCS) is an industry-standard technique where any

one of a group of channels carries the signals for the other channels. Lucent

Technologies uses the 24th channel of a group for signaling. This signaling

technique differs from 24-channel signaling. When the system is configured for

Facility-Associated Signaling, 24-channel signaling uses the 24th channel in a

DS1 facility to carry signals. This technique also is called clear channel,

out-of-band, or alternate voice data (AVD) signaling.

TN464C,

D, E, F3,

and

TN2464

1-24

1-23 (24th

is D-chan)

1-31 (16th

is D-chan)

1-24

1-31

1-30

1.5444

2.048

1.5444

2.048

alaw/mulaw

robbed-bit

isdn-pri4

isdn-ext4

CAS

CO/DID/Tie

ISDN

CO/DID/Tie

TN2242 1-30

1-307

2.048

alaw/mulaw

CAS

isdn-pri

Tie

ISDN

1. CO is any of the following trunk types: CO, FX, WATS.

Tie is any of the following trunk types: access, tie, tandem, RLT, APLT.

2. Common-channel DS1 circuit packs used in CO trunk groups must have a trunk type of auto.

3. Integrated CSU functionality is available only with the TN767D and TN464E or later-suffix DS1

circuit packs. Enhanced ICSU functionality is available only with TN767E, TN464F, and

later-suffix DS1 circuit packs.

4. Mixed-mode signaling is allowed. This means that if the signaling mode is isdn-ext or isdn-pri, a

port from that circuit pack may be used in any trunk group that allows robbed-bit signaling.

5. The TN464B’s companding is based upon the system companding that you administer.

6. ISDN-PRI calls are not guaranteed to work for the TN464B if the system’s companding is set to

mu-law.

7. The administered D-channel on the DS1 screen for ISDN-PRI cannot be a trunk group member.

DS1

Circuit

Packs # Trunk

Members Bit Rate

Mbps Companding Signaling

Mode Trunk Type1

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