CANOGA PERKINS 2270 Fiber Optic Modem - Manual (Page 30)

30
Canoga Perkins
3.6 T1/E1 Interfaces
There are only two versions of T1/E1 interfaces available. The Transparent Bipolar models -B1, B2
and B3 are compatible with any bipolar line coded T1/E1 data and the DS1/T1 Model -T1 is for T1
only.
3.6.1 Transparent Bipolar Models -B1, -B2, -B3
This interface is compatible with any bipolar line coded T1/E1 data (1.544 Mbps/2.048 Mbps). All
types of codes, including AMI, B8ZS, B7S or HDB3, will be accurately transmitted/received (refer
to Table 3-H). Line Build Out settings for T1 are given in Table 3-I.
NOTE: Do not use the first switch setting for T1. It is reserved for E1 only.
NOTE: This interface passes all bipolar violations without correction. If AMI/T1 coding is
used, and correction is desired, the DS1/T1 interface must be used.
NOTE: This interface is not compatible with any other type of interface. If compatibility
with either DS1/T1 interfaces or clock and data interfaces is necessary, the DS1/T1 must
be used.
There are three different types of interface connectors indicated by the number at the end of the
interface code. The connectors are female DA-15 (B1); a four-position terminal block (B2); or two
female BNC (B3). Figure 3-3 shows how the input and output pairs are wired to these connectors.
This interface performs jitter attenuation of the transmit line input signal. It is also designed to
propagate an all "1's" AMI stream if the end-to-end line is interrupted.
NOTE: When using this interface, the modem must be configured for external clock.
Table 3-H. Transparent Bipolar Line Interfaces
Interface
Model # Connector Type Speed
B1 DA 15 1.544 Mhz T1 or 2.048 MHz E1
B2 Terminal Block 1.544 Mhz T1 or 2.048 Mhz E1
B3 BNC 1.544 Mhz T1 or 2.048 Mhz E1