IBM 5280 Manual page 265

COMMUNICATIONS MAP
MAP 3019-3
EIA WRAP ERROR MAP
PAGE
3
OF
12
(Step 001 continued)
Hex
I
Bit
I
'Transmitted' lines
I
Bit
I
'Received' lines
----+-----+----------------------------+-----+-----------------
:: I
~
I
~:~aT:e;:n~d~-============~1 ~
I
~~!:rS~: ~:~d
20 2
Test Control -------------)
2
Carrier Det
10 3 Sel Standby
-------------->
3 Ring Ind
08 4 Rate Sel (Note 1)
---*---->
4 Rec C1k
04
02
01
5
6
7
open line
open line
open line
I
*---->
5
6
7
open line
Xmi t C1 k
open line
Fig. 3. This chart shows the pairs of lines that are wrapped.
Each line is assigned a hex value that is used when the
error is displayed on the screen.
Note 1: Both Xmit elk and Rec Clk are driven by Rate Sel on the
wrap test (Fig 3).
Is an error displayed on the
screen?
Y N
002
The failure is not present.
003
You will need to see MIM 861 to
locate the probe points referred
to by this map.
See Fig. 1 for examples of
extra bits.
Are there
returned?
Y N
8 4
extra bits
being
EC840874 PEC839787
A B MAP 3019-3