General DataComm 551 Operating And Installation Instructions page 32

INSTALLATION
Option Selection
CSU Address 256 addresses,
Number from 000 to 255
Unframed Mode Disabled
Enabled
Transcoding Disabled
Enabled
Network Frame ESF framing
Format
D4 framing
Equipment D4 framing
Frame Format
ESF framing
Auto Framing Enabled
Disabled
DS1 Self-Test 511-bit
Pattern QRS
Line Code AMI code
B8ZS code
Inband Loop- DS1 Line Loop
back Code Test
Type
DS1 Test Loop
2-6
TABLE 2-1. OPTION APPLICATION NOTES
Switch (S) or
Jumper (X)
S4-1
through (see Fig. 2-3
S4-8 and Table 2-2)
S4-7
S4-7
S4-8
S4-8
S5-1
S5-1
S5-2
S5-2
S5-3
S5-3
S5-4
S5-4
S5-5
S5-5
S5-6
S5-6
Position
Various Selects address number for CSU when using PMC-
100s (S6-3 must be ON). Each CSU must have a
unique address number. Factory default is address
number 000 (all switches OFF).
Note: For an installation with MAU-1As, addresses
range from 00 to 31, using switches S4-1 through
S4-5.
OFF * Disables Unframed Mode when not using PMC-100s
(S6-3 must be OFF).
ON Enables Unframed Mode (no framing on either the
equipment side or the network side) when not using
PMC-100s (S6-3 must be OFF). (NOTE: This
overrides the settings for switches S5-1, S5-2, and
S5-3.)
OFF * Disables Transcoding when not using PMC-100s
(S6-3 must be OFF).
ON Enables Transcoding (AMI coding on the equipment
side and B8ZS on the network side) when not using
PMC-100s (S6-3 must be OFF). (NOTE: This
overrides the settings for switches S5-5 and S5-7.)
OFF * Selects Extended Superframe Format (ESF) framing
for the network side (when S5-3 is ON).
ON Selects D4 Superframe Format (D4) framing for the
network side (when S5-3 is ON).
OFF * Selects D4 framing for the equipment side (when
S5-3 is ON).
ON Selects ESF framing for the equipment side (when
S5-3 is ON).
OFF * Enables Auto Framing for both the network and
equipment sides: the DataComm 551 adapts to the
received framing for each side. Do not enable
Auto Framing for both CSUs on a link.
ON Disables Auto Framing. Use S5-1 and S5-2 to
manually select framing.
OFF * Selects 511-bit pattern for DS1 Self-Test.
ON Selects Quasi-Random Signal (QRS) pattern for
DS1 Self-Test (per AT&T PUB 62411).
OFF * Selects Alternate Mark Inversion (AMI) line code.
ON Selects Bipolar with 8 Zero Substitution (B8ZS) line
code.
OFF * DataComm 551 starts or stops a DS1 Line Loop test
when the appropriate inband loopback code is de-
tected (when S6-8 is OFF, and only with ESF
framing on the network side).
ON DataComm 551 starts or stops a DS1 Test Loop test
when the appropriate inband loopback code is de-
tected (when S6-8 is OFF, and only with ESF
framing on the network side).
Description