AT&T Bell System M3212 Manual

(
(
(
I
\
BELL SYSTEM PRACTICES
Pacific Tel.
SECTION 314-900-941PT
Issue B, June 1978
DATA SWITCHING NETWORK
M3212 SYNCHRONOUS/ASYNCHRONOUS MULTIPLEXER
Contents Page
1. GENERAL .........................
1
2. PHYSICAL INSTALLATION
............
1
3. POWER SUPPLY -ADJUSTMENT ........
3
A. Single Power Supply
................
3
B .. Dual Power Supply .................
4
4. MULTIPLEXER STAND-ALONE TEST .....
6
5. MULTIPLEXER SYSTEM TESTS .........
7
1. GENERAL
1.01
This section describes how to install and
test the Computer Transmission Corpora-
tion's (TRAN*) M3212 Synchronous/ Asynchro-
nous Multiplexer. GAEL 1695 authorizes the use
of this equipment in Pacific Company (PAC).
1.02
It is reissued to :
• Revise the section title.
• Change the use of the section as a cover sheet
for the manufacturer's instruction to a regular
section.
• Incorporate information from the manufac-
turer's installation instruction into this sec-
tion.
• Include current information in the perform-
ance of the M3212.
Note:
Marginal arrows used to designate
changes are omitted.
*Registered trademark of Computer Transmission Corporation
1.03
The M3212 is used to multiplex and send
data characters from remote low speed ter-:
minals to the M3201 Data Switch via high speed
(4.8, 9.6, 50 or 56 kb/s) common trunks.
References
1.04
Additional information on the Data Switch-
ing Network is contained in the 314-900
division -layer.
2. PHYSICAL INSTALLATION
2.01
Check to see that the accord is unplugged.
Remove louvered cover from top of multi-
plexer by grasping the louvers and lifting straight
up. Ensure that audible alarm is disabled by un-
hooking the slate wire, tape and store. Remove 4
phillips head screws of fan cover and unplug alarm
harness. Lift fan cover by lip assembly at front
and rear.
2.02
Determine if multiplexer is equipped with
single or dual power supply. Check to see
that power supplies are securely fastened and that
all electrical harness connections to each TB 1 are
secure. Remove 4 screws of back plate below
power supplies. If equipped distribution buss on
left panel, check to see that all electrical harness
connections are secure. Ensure that Molex con-
nector to each chassis shelf is securely mated.
2.03
Check to see that cards (shown in Fig. 1)
are fully seated. Record module number,
serial number, phase letter, and revision num her
of each card. Verify that LPT switch on i10219
(position J20) or 110338 card (position J19) and
CTO DIS switch on 110301 card are off. Also,
verify that SGC switch on 110303 is down.
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A.
Page 1