This has many disadvantages, some of which are:

·  Large analogue signal loss.
·  Hum and Noise pick up.
·  User able to disconnect audio.

·  Often hands free calls not recorded.
·  All wiring not contained in secure equipment room.
·  Usage of valuable structured cable resources.

Advantages
The advantages of using ACL Digital DAC cards over other digital interfaces connected to voice recorders:

·  Long tap length, up to maximum cable length specified by PBX manufacturer

    (aprox 1km).

·  In the event of a failure, DAC cards can be replaced without powering down

     the recorder.

·  The DAC cards are hot-swappable without power down.

·  Speech LED to show call in progress.

·  Sync LED to show data connection between PBX and the extension.

·  Balanced audio output to recorder.

·  Audio output can be driven over long cable length without degradation (up to 500m).

·  Very reliable.
 

Specifications
Inputs to card taken in parallel with existing wiring (except Mitel and Avaya Index where the connection is in series with extension wiring) - no disturbance to existing switch installation or interference with digital switch or telephones.

Negligible loading on line, and no signals transmitted onto line.

Full transformer isolation (>1kV DC) from line.

Individual indication of call in progress via VOX Leds.

Digital mixing of local and distant end speech. Digital sound quality.

Supplied as standard with 2 line channels per card, B1 signal on each ( B2 option 4 channels available).

Plugs into ACL universal digital backplane housed in 3 U high shelves, 15/20 cards (30/40 channels). Or DAC in a box, 2, 4, 6 and 8 channel format with plug top P.S.U.

Alcatel Omni PCX / 4200 / 4400

4xxx

IM12

Ascom 4-wire

All 4 wire Digital Handsets

SB44

Aspect ACD

30xx / 31xx

AS12

Avaya IP Office

DT/TT series / 20xx

EC44 a

Avaya IP Office

4xxx / 6xxx / 8xxx Call Master 3 / 4 / 5

PPM24 SMN

Avaya / Lucent Alchemy

DT/TT series / 20xx

EC44 a

Avaya / Lucent / SDX Index

DT/TT series / 20xx

EC44 a

Avaya / Lucent Definity 4-wire

All 4 wire Digital Handsets

SB44 a

Avaya / Lucent Definity / Prolog 2-wire

4xxx / 6xxx / 8xxx/ Call Master 3 / 4 / 5

PPM24 SMN

Avaya / Bosch DL1000

All 4 wire Digital Handsets

SB24/44

BT / Nortel Meridian (bit 2)

M2xxx / 3xxx / etc M2250 console

PPM24 BT2

BT / Nortel Meridian (bit 4)

M2xxx / 3xxx / etc M2250 console

PPM24 BT4

BT / Nortel Norstar

M7xxx / T7xxx

PPM24 NOR

Ericsson MD110

All Phones Connected to ELU25 / 28 / 29 Cards / Consono / DBC2xx

PPM24 NAT

Ericsson MD110

Feature Phones connected to ELU5 (old digital phones) / DBC561

IX12 / E18

Ericsson MD110

Consoles connected to ELU5 (old consoles) / basic digital phones

IX12 / E16

Ericsson ACD 1000

All Phones Connected to ELU25 / 28 / 29 Cards / Consono / DBC2xx

PPM24 NAT

Ericsson ACD 6000

All 4 wire Digital Handsets

SB44

GPT / Realitis ISDX 4-wire

D60 / D70 / D80

SB24/44

GPT / Realitis ISDX ACD terminals

MK2 / 3 / 4 / 5 / PC Based / Screen Based Consoles

IX12

GPT ISDX Mercury / Tel. Rentals ISDT

ISDT30 / ISDT300

PPM24 SMN

Inter-tel Axxess

All 2 wire Digital Handsets

PPM24 AKM

LG / Goldstar

All 2 wire Digital Handsets

PPM24 NAT

Matra Nortel MC650x

MC4xx / MC5xx / M760

AS12

Mitel SX200 / SX2000 / Lite

Superset 4xxx / 70 / 700 / 7000

EC44 Mu

Philips IS3000 2-wire (Philips “U”)

D3xx (2-wire)

PPM24 SMN

Philips IS3000 4-wire

D3xx / D6xx (4-wire)

SB24/44

Rockwell ACD terminals

4-wire / 2 channels

All 4 wire Digital Handsets

SB44

Samsung DCX

All 2 wire Digital Handsets

PPM24 NAT

Siemens Hicom/

Hipath 2-wire

All 2 wire Digital Telephone

Connected to SLMO/SLMU

Cards / Optiset E / Optipoint

PPM24 SMN

Siemens Realitis 4-wire

D60 / D70 / D80

SB24/44

Telrad 2-wire

All 2 wire Digital Handsets

PPM24 TR

Telrad 4-wire

All 4 wire Digital Handsets

SB24/44

Tenovis

All 4 wire Digital Handsets

SB24/44

Toshiba Strata

DKT25xx / DKT30xx

PP24 TSH