Loop-V 4200-28 SERIES
Integrated Multiservice Access Platform -

OC3/STM Access, DS3 Access, CSU/DSU, E1/T1 CONVERTER, & DACS

The V-4200-28 is no longer available for new projects. Please check out one of our other Access Platforms. here. If you need service or wish to replace an existing 28 slot V-4200, please contact your sales representative.

img NEBS Certified
img 28 low speed plug-in slots.
img 2 high speed plug-in slots for dual redundant OC3/STM 1, DS3, or E3 services.
img Multiple plug-in types -
img T1, E1 interface cards
img V.35, EIA530, RS232, X.21 interface cards
img QFXS, QFXO, E&M interface cards
img MDSL interface card
img T1/E1 ATM Frame Relay interface cards
img Router interface card with Subnet management (SNMC)
img OCU DP interface card
More are being developed.
img Usable as a OC3/STM 1 Access devices, CSU/DSU, E1 to T1 converter, multiple CSUs, or a DACS.
img DS3 interface supports G.747.
img Full TSI capability among all low speed slots in main unit.
img Full time-slot assignment from low speed to high speed ports.
img Remote diagnostics capabilities
img Management through Console port, Ethernet port, and SNMP agents.
img Optional Sub-Net Management facility for remote, inband, management through national networks.
img Multicolor LED indicators for each of the ports.
img Redundant power supply, redundant CPU.
img Firmware field upgrade through download.
img Optional GUI NMS with LoopView.

The Loop-V 4200-28 IMAP is a versatile device with 3 high speed and 28 low speed slots. Depending on the plug-in cards selected, this unit can be configured (a) as an OC3 (STM1/STS3) access device, (b) as a T1/E1 CSU/DSU with drop and insert and voice capabilities, (c) as an E1 to T1 converter (or fractions of them), (d) as a digital cross-connect system (DACS), and (e) as a channel bank. As a CSU/DSU, data from the V.35 or X.21 port can occupy any fraction of an E1 or T1 port. As an E1 to T1 converter, A to img law and signaling conversions are correctly handled. For both E1 and T1 ports, continuous error checking, performance polling, and in-service diagnostics are provided. In any of the above combinations, full time slot interchange (TSI) among the ports are possible, making the Loop-V 4200-28 a small DACS (digital access cross-connect system). All the low speed ports can be muxed to the high speed ports.

The Loop-V 4200-28 supports local control and diagnostics by using a VT-100 terminal connected to the console port. The Loop-V 4200-28 also supports Ethernet, Telnet, and SNMP, so it can be controlled and diagnosed from remote locations. The Loop-V 4200-28 also supports inband Management, where management data is carried the same way as user data, traversing national networks.

Multicolor LEDs provide status indication for power, test condition, and alarm for each of the ports. Internal firmware is stored in flash memory so that future firmware upgrades can be downloaded.

Ordering Information
To specify options, choose from list below:




Main Unit

Loop-V 4200-28CH

Main unit w/o CPU and power supply

Basic Chassis

Loop-V 4200-28CC-T CPU/DCS card w/ T1 External Clock

Order two for redundancy

Loop-V 4200-28CC-E

CPU/DCS card w/ E1 External Clock

Loop-V 4200-28CC-SNMP-T CPU/DCS card w/ SNMP and T1 External Clock

Order two for redundanc

Loop-V 4200-28CC-SNMP-E

CPU/DCS card w/ SNMP and E1 External Clock

High Speed Module

Loop-V 4228-STM1-T

1310 nm STM1 interface w/ T1 mapping Other optical frequency and connector types are available.
Loop-V 4228-STM1-E 1310 nm STM1 interface w/ E1 l mapping
Loop-V 4228-OC3-T 1310 nm OC3 interface w/ T1 mapping
Loop-V 4228-OC3-E 1310 nm OC3 interface w/ E1 l mapping
Loop-V 4228-CBL Shelf Connection Cable supports up to 2 Expansion Shelves .
Loop-V 4228-HPCop Hardware Protection Card for STM1/ OC3,
w/ SC connector
Other connector types are available.
Loop-V 4228-HPCel Hardware Protection Card for DS3/ E3 .
Loop-V 4228-DS3-T DS3 interface w/ T1 mapping .
Loop-V 4228-DS3-E DS3 interface w/ E1 mapping .
Loop-V 4228-E3 E3 interface .

Low Speed Module (Select 1 to 28 cards.)

Loop-V 4200-T1 T1 interface card .
Loop-V 4200-E1 E1 interface card
Loop-V 4200-V35 V.35/DB25 interface card
Loop-V 4200-E530 EIA530 interface card
Loop-V 4200-RS232 RS232 interface card
Loop-V 4200-X21 X.21 interface card
Loop-V 4200-QFXS Quad FXS voice card
(For AC, -48Vdc power supply only.)
Loop-V 4200-QFXO Quad FXO voice card
Loop-V 4200-Q2EM-m-Tn

Quad 2 Wire E&M voice card
(For AC, -48Vdc power supply only.)

Where m
= B for normal E&M, or TO
= A for tandem operation
Where n
= 1 to 5 of E&M Signaling Type
= O for TO
Loop-V 4200-Q4EM-m-Tn

Quad 4 Wire E&M voice card
(For AC, -48Vdc power supply only.)

Loop-V 4200-MDSL Multi-rate SDSL .
Loop-V 4200-AFRT T1 Frame Relay to ATM inter-working or
Frame Relay to Frame Relay concentration
Loop-V 4200-AFRE E1 Frame Relay to ATM inter-working or
Frame Relay to Frame Relay concentration
Loop-V 4200-RT Dual LAN port (10 & 10/100 BaseT) Router card,
w/ Subnet management (SNMC)
Loop-V 4200-ODP OCU DP interface card

Power Module

Loop-V 4228-DC48

Single DC supply (48Vdc)

Order two for redundancy

Loop-V 4228-AC

Single AC supply

Loop-V 4200-28 Integrated Multiservice Access Platform Product Specification
NOTE: See separate data sheets for additional interface cards.
Optional redundant

Time Slot Interchange

Less than 400 ms delay

Four available maps (Only one is active)

Voice Channel Conversion
A-law to img-law G.711
CAS Signaling Transparent, (A=0 from E1 becomes A=0 to T1, etc.)

Dimensions 43.8 x 22 x 35 cm, 17.24" x 8.66" x 13.78", 10U x 5U x 8U (WxHxD)
Temperature Range 0 - 50¢X C
Humidity 0 - 95% RH (non-condensing)
Mounting Desk-top stackable, 19/23 inch rack mountable
Weight 44.44 lb., (20 Kg) without plug-in cards

Electrical Power

Field changable AC or DC, optional redundant mixed AC or DC

200 Watts

DC : 48 Vdc

AC : 95 to 240 Vac, 50/60 Hz

Performance Monitor

Performance Store

The last 24 hours performance in 15-minute intervals

Monitor Registers

Line, user

Performance Reports

Date & Time, Errored Second, Degraded Minutes, Unavailable Second, Bursty Errored Second, Severe Errored Second, Controlled Slip Second, and Loss of Frame Count

Alarm History

Date & Time, Alarm Type (i.e. Master Clock Loss, RAI, AIS, LOS, BPV, ES, CS)


Bipolar Violation, Errored Second, Unavailable Second, Controlled Slip Second

Network Management


DB9 at front panel


RS232 interface


Menu driven VT-100 terminal

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Ethernet Port (optional)


RJ45 at front panel


Telnet and Embedded SNMP

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Front Panel
LED 4 LEDs per mux card (one LED per plug-in card)

Rear Panel

Applications Illustrations

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