Verso / Verilink Mega T
Multiple T1 Inverse Multiplexer

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Mega-T / Mega-E Family Bit-Based Inverse Multiplexer

Choose the Mega-T/Mega-E family of inverse multiplexers if you want to deploy the simplest, bit-based approach at the Layer 1 level of the serial bitstream. Combine up to four T1 or E1 lines to create a single, logical, high-speed data channel. The advantage is that this method is entirely independent of the protocols of the data being transmitted and of the network equipment and can be used in virtually any application

The Mega-T Multiple T1 Inverse Multiplexer bridges the gap between T1 and T3. Inverse multiplexing up to four T1 lines, Mega-T creates a single logical data channel which is the sum of the T1 bandwidths.  On the DTE side, Mega-T provides an EIA530 (V.35/RS449) or HSSI port operating at data rates in multiples of 1.344 or 1.528 Mbps, up to
6.112 Mbps. On the network side, T1 interfaces support all standard framing and coding formats and include optional built-in CSUs.

To ensure that your communication link remains available if an individual T1 line does not meet your performance requirements, Mega-T can automatically fall back to a lower data rate. Mega-T can automatically restore a dropped T1 line when performance again meets your requirements.

Mega-T includes advanced monitoring and alarm functions to help you maintain your critical communication channels. And built-in diagnostics ensure that you can isolate problems quickly and accurately.


Here, the Mega-T inverse multiplexes 4 T1 lines to create a high-speed 6.112 channel for a LAN internetworking
application. The public network can be accessed directly through T1 access lines, as shown, or through an M13
multiplexer and T3 access line.

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Protocol Independent ? Integrates into almost any

application, regardless of the protocols, the data being

transmitted, and the network equipment

Automatic Rate Fallback and Recovery ? If a line fails,

Mega-T automatically falls back to a lower data rate,

and automatically restores the dropped line

Management ? Terminal interface with local and remote

access; integral SNMP; menu-driven front-panel LCD;

advanced performance monitoring and diagnostics



Network ? 2 or 4 T1 ports

Rate ? 1.544 Mbps ?50 ppm

Framing ? D4 or ESF

Line Coding ? AMI or B8ZS

Electrical ? Per AT&T Pub 62411

Surge Protection ?- 1000 V pulse per AT&T Pub 43602;

cross-voltage protection per Ul1459 (Issue 2)

Connectors ? Four DA15; adapters for RJ48 and wire

wrap (up to 655 feet for DSX-1)

DTE Data Ports ? Two or four HSSI ( differential ECL) or

HSD (CCITT V.35 ? V10/11 ? and/or RS449)

Interface Type ? HSSI: SCSI-II 50-pin female connector;

HSD: DB25 female connector (EIA530); adapters for

MS34 (V.35) and DC37 (RS449)

Data Rates ? Any multiple of 1.344 (when 7-bit stuffing

is employed) or 1.528 Mbps, up to 2.688/3.056 Mbps

(2T1s) or 5.376/6112 Mbps (4 T1s)

Station Clock Input ? TTL Levels; 50 ohms impedance;

BNC connector



DS1 Alignment Algorithm ? 1 to 4 DS1s user-mapped in

any pattern

Idle Pattern ? All ONES on DTE port loss

T1 Differential Delay ? Up to 125 milliseconds



Front Panel ? Menu-driven, 80-character LCD, 8 entry

keys, 4 LED status indicators

Local/Remote Port ? Two RS232 ASCII, to 9600 baud;

DE-9 (EIA574) male connectors

SNMP ? Connection via SLIP; integral agent per RFC




Performance Registers ? Per AT&T Pub 54016 (Issue 2),

plus additional 24-hour registers for logical channel

Alarms ? Automatic dialout on user-specified alarms

(Hayes-compatible dialer); automatic rate fall back on

selected alarms; optional automatic restoral

Loopbacks ? Per AT&T Pubs 62411 and 54016, plus

local/remote DTE and logical channel loops.



Power ? -48 V dc office battery (-43 to -53 V dc); standard

115 V ac, 50 to 60 Hz; 0.5 A max at -48 V, 0.5V peak-topeak

rippled at maximum input current

Dimensions ? (H x W x D) 1.75 x 17 x 12 inches; 4.4x 43.2

x 30.5 cm, brackets for 19- or 23-inch rack

Environment ? 0 to 50 ?C (32 to 122 ?F) ambient; up to

95% relative humidity, non-condensing

Regulatory Compliance ? FCC Parts 15 & 68; UL 1459

(Issue 2)




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